Spare tire discussion

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Which size spare would you get?

  • 33-inch spare under the body

    Votes: 37 71.2%
  • 35-inch spare in the bed

    Votes: 15 28.8%

  • Total voters
    52
In regards to ICE vehicles, as long as you don’t have an LSD in the transfer case or diffs it should be mechanically fine at low speeds. I wouldn’t drive above 50mph with mismatched tires though.

Another consideration would be your ABS and traction systems freaking out since the shorter tire will be spinning at a faster rate.

EV traction control systems may get really fussy about it.

You may be able to stuff a 35” underneath in the stock location if you deflate it and use a ratchet strap to compress it. Some Toyota guys do this if they can’t afford a swing out bumper yet. A 35” pizza cutter would be less likely to scrape on surfaces, save a little weight, and it probably be safer as a spare on the road than the 33”.

Can’t say for sure until people start measuring and fiddling with them but figured it was worth suggesting.
With an onboard compressor this is very feasible. Nice solution to an annoying little problem. Definity adding this tidbit to my Scout diary.
 
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In regards to ICE vehicles, as long as you don’t have an LSD in the transfer case or diffs it should be mechanically fine at low speeds. I wouldn’t drive above 50mph with mismatched tires though.

Another consideration would be your ABS and traction systems freaking out since the shorter tire will be spinning at a faster rate.

EV traction control systems may get really fussy about it.

You may be able to stuff a 35” underneath in the stock location if you deflate it and use a ratchet strap to compress it. Some Toyota guys do this if they can’t afford a swing out bumper yet. A 35” pizza cutter would be less likely to scrape on surfaces, save a little weight, and it probably be safer as a spare on the road than the 33”.

Can’t say for sure until people start measuring and fiddling with them but figured it was worth suggesting.
My truck came with a 32” spare for the four 33”. It doesn’t care. It’s meant to be temporary, though, so it’s not a good idea to drive with the spare for more than the distance required to get the main tire repaired.

The mention of pizza cutters also brought to mind the question of whether the Traveler’s carrier would accommodate tires wider than the OEM tires. Is there enough space in there if someone wants to increase in width? No idea, but certainly something people will eventually want to know.
 
My truck came with a 32” spare for the four 33”. It doesn’t care. It’s meant to be temporary, though, so it’s not a good idea to drive with the spare for more than the distance required to get the main tire repaired.

The mention of pizza cutters also brought to mind the question of whether the Traveler’s carrier would accommodate tires wider than the OEM tires. Is there enough space in there if someone wants to increase in width? No idea, but certainly something people will eventually want to know.
The gap between a 32" and 33" tires is a much smaller delta than going from a 33" to a 35". You are right though, it just needs to get you to a tire shop.

I am not sure about the width in the carrier. It would probably be tricky to widen unless they use a modular design with multiple sizes.

Wheel offset for the spare will also be critical with it being able to fit even if the tire diameter and width is the same.

If you opt for wider stance aftermarket wheels, you may still need to use a factory offset wheel as a spare.


So I guess if you plan to modify your wheel and tire choice, your safest bet would be to skip the factory carrier and wait for the aftermarket swingout bumper carriers or purchase a hitch mounted carrier.
 
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The other factor to consider with wheel and tire sizes will be the size of the brakes. I know on my truck I can't get anything smaller than a 20" wheel due to the size of the brake calipers. TBD on what size brakes Scout will employ in production, but could be a limiting factor on wheel size.
 
The other factor to consider with wheel and tire sizes will be the size of the brakes. I know on my truck I can't get anything smaller than a 20" wheel due to the size of the brake calipers. TBD on what size brakes Scout will employ in production, but could be a limiting factor on wheel size.
I believe somewhere @Jamie@ScoutMotors mentioned no wheel smaller than 18”, but I can’t recall where I thought I saw that so I could be hallucinating it.
 
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With 4wd and open differentials, you can definitely drive with different tire sizes.

I've driven maybe 50-100 miles on the highway with three 31in tires, and one 235/75 R15 (which is just under 29in). I'd hit a ~4in thick piece of angle iron on the freeway while I was boxed in around a corner, had to use the stock size spare on my ZJ.

I swapped it out asap, but, it did the trip just fine. Haven't had any issues with the vehicle, and that incident was... 9-10 years ago now. So if there were any long term implications of doing that, I'd surely have noticed them by now.

Also, I'm totally ok with a pizza cutter (narrower spare, in the same diameter) if this helps give more flexibility in spare tire placement/fitment.

For instance, I've advocated for 3 spare tire locations for the Traveler.
  • External spare tire carrier (confirmed, optional)
    • Pros:
      • Great for full size spares, particularly in larger sizes.
      • Saves interior space
      • Removeable
    • Cons:
      • Extends Overall Length massively (~18in), making fitment in small garages difficult
      • Makes accessing the rear liftgate storage area more cumbersome
      • Makes using certain rear accessories difficult (hitch mounted bike racks for instance)
  • Inside rear cargo storage area (not mentioned, but possible. Similar to how the Jeep ZJ does it, or the new Honda Pilot Trailsport does it. Secured vertically against the side of the rear storage area behind the 2nd row)
    • Pros:
      • More Aerodynamic than external carrier
      • Shorter vehicle length fits in more garages/parking areas.
      • Doesn't interfere with hitch mounted rear accessories.
    • Cons:
      • Uses a lot of rear liftgate storage space
      • You may have to unpack the storage space to remove/access the spare tire
  • Under floor storage area (confirmed for Terra, I think mentioned for Traveler?)
    • Pros:
      • Efficient use of interior/external space
      • More aerodynamic than external carrier
      • Saves internal cargo floor space.
    • Cons:
      • Likely only available on the BEV version?
      • Likely limited in the size of the spare that will fit (diameter, width, or both).
      • Access to the spare may be more difficult/involve unloading any cargo in the storage area (if its an underfloor spare accessed from the top/inside the storage area.
But I do want the option to have a spare. And I would be willing to use a smaller than full size spare if needed (not an emergency doughnut, but like a 33x10.5x18 (the "pizza cutter" mentioned above) or something could be a decent spare for a 33x12.50R18 or 35x12.50R18 if needed), but still want the option to carry a full size spare if desired.

The ultimate goal is flexibility of storage/length metrics, while individually adjusting our risk tolerance with the quality/size of the spare.

So for instance, I might toss on the optional rear tire carrier for a long road trip through the mountains to keep space in the rear for more cargo, but around town I would use the in rear storage area spare, to make it fit in my garage.
 
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With 4wd and open differentials, you can definitely drive with different tire sizes.

I've driven maybe 50-100 miles on the highway with three 31in tires, and one 235/75 R15 (which is just under 29in). I'd hit a ~4in thick piece of angle iron on the freeway while I was boxed in around a corner, had to use the stock size spare on my ZJ.

I swapped it out asap, but, it did the trip just fine. Haven't had any issues with the vehicle, and that incident was... 9-10 years ago now. So if there were any long term implications of doing that, I'd surely have noticed them by now.

Also, I'm totally ok with a pizza cutter (narrower spare, in the same diameter) if this helps give more flexibility in spare tire placement/fitment.

For instance, I've advocated for 3 spare tire locations for the Traveler.
  • External spare tire carrier (confirmed, optional)
    • Pros:
      • Great for full size spares, particularly in larger sizes.
      • Saves interior space
      • Removeable
    • Cons:
      • Extends Overall Length massively (~18in), making fitment in small garages difficult
      • Makes accessing the rear liftgate storage area more cumbersome
      • Makes using certain rear accessories difficult (hitch mounted bike racks for instance)
  • Inside rear cargo storage area (not mentioned, but possible. Similar to how the Jeep ZJ does it, or the new Honda Pilot Trailsport does it. Secured vertically against the side of the rear storage area behind the 2nd row)
    • Pros:
      • More Aerodynamic than external carrier
      • Shorter vehicle length fits in more garages/parking areas.
      • Doesn't interfere with hitch mounted rear accessories.
    • Cons:
      • Uses a lot of rear liftgate storage space
      • You may have to unpack the storage space to remove/access the spare tire
  • Under floor storage area (confirmed for Terra, I think mentioned for Traveler?)
    • Pros:
      • Efficient use of interior/external space
      • More aerodynamic than external carrier
      • Saves internal cargo floor space.
    • Cons:
      • Likely only available on the BEV version?
      • Likely limited in the size of the spare that will fit (diameter, width, or both).
      • Access to the spare may be more difficult/involve unloading any cargo in the storage area (if its an underfloor spare accessed from the top/inside the storage area.
But I do want the option to have a spare. And I would be willing to use a smaller than full size spare if needed (not an emergency doughnut, but like a 33x10.5x18 (the "pizza cutter" mentioned above) or something could be a decent spare for a 33x12.50R18 or 35x12.50R18 if needed), but still want the option to carry a full size spare if desired.

The ultimate goal is flexibility of storage/length metrics, while individually adjusting our risk tolerance with the quality/size of the spare.

So for instance, I might toss on the optional rear tire carrier for a long road trip through the mountains to keep space in the rear for more cargo, but around town I would use the in rear storage area spare, to make it fit in my garage.
I have a question. The Traveler tire carrier is attached and has a latch when you close it. If it’s optional and you remove it you are still going to have the hinge and then the hole where it latches. Occasionally I will see a Wrangler with the rear tire removed and the bracket is on the back just with no tire.

So what’s everyone expecting it to look like without the tire carrier on the back of the Traveler?

Here is a picture I took at Nats where the tailgate was closed but the tire carrier hadn’t been closed yet. You can see the hole the latch will go in on the left.

DSC00501.jpeg
 
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With 4wd and open differentials, you can definitely drive with different tire sizes.

I've driven maybe 50-100 miles on the highway with three 31in tires, and one 235/75 R15 (which is just under 29in). I'd hit a ~4in thick piece of angle iron on the freeway while I was boxed in around a corner, had to use the stock size spare on my ZJ.

I swapped it out asap, but, it did the trip just fine. Haven't had any issues with the vehicle, and that incident was... 9-10 years ago now. So if there were any long term implications of doing that, I'd surely have noticed them by now.

Also, I'm totally ok with a pizza cutter (narrower spare, in the same diameter) if this helps give more flexibility in spare tire placement/fitment.

For instance, I've advocated for 3 spare tire locations for the Traveler.
  • External spare tire carrier (confirmed, optional)
    • Pros:
      • Great for full size spares, particularly in larger sizes.
      • Saves interior space
      • Removeable
    • Cons:
      • Extends Overall Length massively (~18in), making fitment in small garages difficult
      • Makes accessing the rear liftgate storage area more cumbersome
      • Makes using certain rear accessories difficult (hitch mounted bike racks for instance)
  • Inside rear cargo storage area (not mentioned, but possible. Similar to how the Jeep ZJ does it, or the new Honda Pilot Trailsport does it. Secured vertically against the side of the rear storage area behind the 2nd row)
    • Pros:
      • More Aerodynamic than external carrier
      • Shorter vehicle length fits in more garages/parking areas.
      • Doesn't interfere with hitch mounted rear accessories.
    • Cons:
      • Uses a lot of rear liftgate storage space
      • You may have to unpack the storage space to remove/access the spare tire
  • Under floor storage area (confirmed for Terra, I think mentioned for Traveler?)
    • Pros:
      • Efficient use of interior/external space
      • More aerodynamic than external carrier
      • Saves internal cargo floor space.
    • Cons:
      • Likely only available on the BEV version?
      • Likely limited in the size of the spare that will fit (diameter, width, or both).
      • Access to the spare may be more difficult/involve unloading any cargo in the storage area (if its an underfloor spare accessed from the top/inside the storage area.
But I do want the option to have a spare. And I would be willing to use a smaller than full size spare if needed (not an emergency doughnut, but like a 33x10.5x18 (the "pizza cutter" mentioned above) or something could be a decent spare for a 33x12.50R18 or 35x12.50R18 if needed), but still want the option to carry a full size spare if desired.

The ultimate goal is flexibility of storage/length metrics, while individually adjusting our risk tolerance with the quality/size of the spare.

So for instance, I might toss on the optional rear tire carrier for a long road trip through the mountains to keep space in the rear for more cargo, but around town I would use the in rear storage area spare, to make it fit in my garage.


We are both thinking about old ICE drivetrains, but it still isnt know if running mismatched tires with 2"+ od diameter difference will cause traction control issues on an EV.

it might think the smaller tire is "slipping" since it is spinning faster and cut power to that axle, or even apply the brakes to that hub.

Maybe @SpaceEVDriver or @R1TVT can experiment for us. Ha
I believe somewhere @Jamie@ScoutMotors mentioned no wheel smaller than 18”, but I can’t recall where I thought I saw that so I could be hallucinating it.



Pizza cutters are making a comeback. Something tells me they will be a popular spare choice as well.

Kenda offers a 33"X10.50R18, but unfortunately their largest Pizza Cutter only comes in 35X10.50R17 so that may not work without clearancing the calipers.

EVs use regenerative braking for a majority of their stopping duty, right? It doesnt make sense to me as to why Scout would use a brake disc so large that it requires an 18" wheel.

17" wheels are my preference and the tires for that size wheel are usually much cheaper than tires for 18" and 20" wheels. 18" wheels are an acceptable compromise but there is less rubber to cushion the ride and protect the rim from potholes or trail hazards.
 
There is a filler panel that contains the license plate on the left side. Hopefully we have something to show you all soon on that front. :D
Well now I have another question. If you don’t want to remove the tire carrier is the license plate going to still be on the left?

I have so many questions!

I know, I know I have to stick to my motto. Faith and patience.
 
We are both thinking about old ICE drivetrains, but it still isnt know if running mismatched tires with 2"+ od diameter difference will cause traction control issues on an EV.

it might think the smaller tire is "slipping" since it is spinning faster and cut power to that axle, or even apply the brakes to that hub.

Maybe @SpaceEVDriver or @R1TVT can experiment for us. Ha




Pizza cutters are making a comeback. Something tells me they will be a popular spare choice as well.

Kenda offers a 33"X10.50R18, but unfortunately their largest Pizza Cutter only comes in 35X10.50R17 so that may not work without clearancing the calipers.

EVs use regenerative braking for a majority of their stopping duty, right? It doesnt make sense to me as to why Scout would use a brake disc so large that it requires an 18" wheel.

17" wheels are my preference and the tires for that size wheel are usually much cheaper than tires for 18" and 20" wheels. 18" wheels are an acceptable compromise but there is less rubber to cushion the ride and protect the rim from potholes or trail hazards.

Fair point. Mechanically there are no issues, but there could be other issues.

However, I'd hope/assume (and I thought had been confirmed, but maybe I'm halucinating??) that in a vehicle like the Scout, we'd have the ability to turn off the traction control completely? If not, then a "I just put on this tiny spare tire" mode might do the same thing.

And agreed, especially for spares (and especially if we do the spare inside the cargo area of the Traveler), a pizza cutter makes a lot of sense. It takes up way less room, and can even reduce the OAL of the vehicle for the rear mounted spare.

Although, with the tire carrier designed how it is (with the tire carrier going OUTSIDE of the tire), a pizza cutter might not help with the OAL.

Also, regenerative braking doesn't work if the battery is full afaik. So while unlikely, its possible that you'd be dealing with a full battery, and towing something, so legally, I think they might need to have "full size brakes". Which I'm ok with (even though I'm still fine with 15in wheels :D).

I have a question. The Traveler tire carrier is attached and has a latch when you close it. If it’s optional and you remove it you are still going to have the hinge and then the hole where it latches. Occasionally I will see a Wrangler with the rear tire removed and the bracket is on the back just with no tire.

So what’s everyone expecting it to look like without the tire carrier on the back of the Traveler?

Here is a picture I took at Nats where the tailgate was closed but the tire carrier hadn’t been closed yet. You can see the hole the latch will go in on the left.

View attachment 8012
Oh, good point.

I'm especially curious about the hinge on the right.

There is a filler panel that contains the license plate on the left side. Hopefully we have something to show you all soon on that front. :D
This is great info, thank you!
 
Fair point. Mechanically there are no issues, but there could be other issues.

However, I'd hope/assume (and I thought had been confirmed, but maybe I'm halucinating??) that in a vehicle like the Scout, we'd have the ability to turn off the traction control completely? If not, then a "I just put on this tiny spare tire" mode might do the same thing.

And agreed, especially for spares (and especially if we do the spare inside the cargo area of the Traveler), a pizza cutter makes a lot of sense. It takes up way less room, and can even reduce the OAL of the vehicle for the rear mounted spare.

Although, with the tire carrier designed how it is (with the tire carrier going OUTSIDE of the tire), a pizza cutter might not help with the OAL.

Also, regenerative braking doesn't work if the battery is full afaik. So while unlikely, its possible that you'd be dealing with a full battery, and towing something, so legally, I think they might need to have "full size brakes". Which I'm ok with (even though I'm still fine with 15in wheels :D).


Oh, good point.

I'm especially curious about the hinge on the right.


This is great info, thank you!

Traction Control is a limiting factor for a lot of vehicles. For a long time Rivians would get stuck climbing muddy/snowy tracks because Traction Control would cut power when wheels started spinning, even if you "disable" it. It would also do this if you are drifting in one with Traction Control disabled or on the lowest setting. I know they recently released a new UI page/drive mode that gives you a lot more control over the traction system and vehicle dynamics so maybe its less of an issue.

Even the Ineos Grenadier gas lights you into thinking you disabled it, but still kicks in in the worst situations.

The only ways that I am aware of that completely disables traction control on a vehicle are removing the fuse to the ABS module, disabling one of the wheel sensors, or engaging a diff locker.

I think manufacturers dont want people standing on the throttle and breaking axle/CV shafts, but there are times where it engaging can be more dangerous than breaking an axle shaft.

Ah shit you are right about the battery being full and regen brakes not being available. @SpaceEVDriver has mentioned it a few times when they gently try to educate me, but I keep forgetting lol.
 
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Traction Control is a limiting factor for a lot of vehicles. For a long time Rivians would get stuck climbing muddy/snowy tracks because Traction Control would cut power when wheels started spinning, even if you "disable" it. It would also do this if you are drifting in one with Traction Control disabled or on the lowest setting. I know they recently released a new UI page/drive mode that gives you a lot more control over the traction system and vehicle dynamics so maybe its less of an issue.

Even the Ineos Grenadier gas lights you into thinking you disabled it, but still kicks in in the worst situations.

The only ways that I am aware of that completely disables traction control on a vehicle are removing the fuse to the ABS module, disabling one of the wheel sensors, or engaging a diff locker.

I think manufacturers dont want people standing on the throttle and breaking axle/CV shafts, but there are times where it engaging can be more dangerous than breaking an axle shaft.

Ah shit you are right about the battery being full and regen brakes not being available. @SpaceEVDriver has mentioned it a few times when they gently try to educate me, but I keep forgetting lol.

Bah. I hate things that stay enabled, when you "disable" them. At least just say "can't fully disable, but now you're in the lowest setting" so I know what to expect.

Wheelspeed/wheelspin is an important asset in some offroading situations. Like in mud/sand.

And other times, while sort of counter-intuitive, it can be nice to have NO locking (when on ice, if all the power goes to one wheel that is spinning while cornering... the other one just sits there, and acts as a bit of an anchor... lockers are a handful to drive in the snow/ice for this same sort of reason).

I know back in the day, there was something like a ~20% speed differential required before limited slip differentials would kick in? I've also seen references to a "few hundred rpm" difference between the wheels of the axle before it would start sending power over. So that is useful information, because we can do the math to figure out the difference in RPM on the freeway.

And, using AI to do some math I wouldn't really want to do myself, I see that a 33in tire spins 41rpm faster than a 35in tire at 70mph.

1753900781619.png


Which is different, don't get me wrong. But, its also not a huuuuge difference either. Not enough to kick in many mechanical LSD type differentials (which, I know is sort of irrelevant, but its also the only data point I have, so I'm using it).
 
We are both thinking about old ICE drivetrains, but it still isnt know if running mismatched tires with 2"+ od diameter difference will cause traction control issues on an EV.

it might think the smaller tire is "slipping" since it is spinning faster and cut power to that axle, or even apply the brakes to that hub.

Maybe @SpaceEVDriver or @R1TVT can experiment for us. Ha

What happens will depend on the specific axle/motor/suspension design.

On the Lightning, there are two separately-powered, normally open differentials (rear has a locker) with motors attached to each. It has independent suspension at all four corners.

This is similar, though not exactly the same as, a gasser with a transfer case sending power to the front and rear differentials. An odd-sized tire on the rear will be fine for a short distance as long as the rear locker isn’t engaged. An odd-sized tire on the front will mess with steering dynamics, etc. For either front or back, too large a difference will probably mess with traction control and ABS. The wheel speeds will be odd. If you run this way for too long, I’m sure the computer will throw a code. I’ve run about 100 miles with my 32 in place of a flat 33. But as mentioned earlier, that’s not as big a difference as a 35” spare for 37”s or a 33” spare for 35”s.

If you lock the rear diff with an odd sized tire, then it’ll start to cause additional problems.

Any big difference will put additional wear on the suspension and on the tire that’s differently-sized. That tire is also likely going to be somewhat out of camber relative to the other tires. Running a long distance with that will, eventually, show up in additional maintenance.


Pizza cutters are making a comeback. Something tells me they will be a popular spare choice as well.

Kenda offers a 33"X10.50R18, but unfortunately their largest Pizza Cutter only comes in 35X10.50R17 so that may not work without clearancing the calipers.

EVs use regenerative braking for a majority of their stopping duty, right? It doesnt make sense to me as to why Scout would use a brake disc so large that it requires an 18" wheel.

17" wheels are my preference and the tires for that size wheel are usually much cheaper than tires for 18" and 20" wheels. 18" wheels are an acceptable compromise but there is less rubber to cushion the ride and protect the rim from potholes or trail hazards.

Full-sized brakes are a federal requirement. EVs cannot rely on non-mechanical means to brake the vehicle in an emergency.

I wish my Lightning could take 17” wheels. Technically it can (and so, likely, will the Scout): With a ridiculous offset that I’m unwilling to put on my truck.
 
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What happens will depend on the specific axle/motor/suspension design.

On the Lightning, there are two separately-powered, normally open differentials (rear has a locker) with motors attached to each. It has independent suspension at all four corners.

This is similar, though not exactly the same as, a gasser with a transfer case sending power to the front and rear differentials. An odd-sized tire on the rear will be fine for a short distance as long as the rear locker isn’t engaged. An odd-sized tire on the front will mess with steering dynamics, etc. For either front or back, too large a difference will probably mess with traction control and ABS. The wheel speeds will be odd. If you run this way for too long, I’m sure the computer will throw a code. I’ve run about 100 miles with my 32 in place of a flat 33. But as mentioned earlier, that’s not as big a difference as a 35” spare for 37”s or a 33” spare for 35”s.

If you lock the rear diff with an odd sized tire, then it’ll start to cause additional problems.

Any big difference will put additional wear on the suspension and on the tire that’s differently-sized. That tire is also likely going to be somewhat out of camber relative to the other tires. Running a long distance with that will, eventually, show up in additional maintenance.




Full-sized brakes are a federal requirement. EVs cannot rely on non-mechanical means to brake the vehicle in an emergency.

I wish my Lightning could take 17” wheels. Technically it can (and so, likely, will the Scout): With a ridiculous offset that I’m unwilling to put on my truck.
Yeah, running long term with a spare that is undersized, will create additional wear and tear (at very least on the tire).

For the context of a space saver sort of spare tire, thats probably ok, as its not really intended to be a normal everyday tire, just enough that it can get you out of dodge if something goes wrong (better than a patch kit).

For "actual" offroading, a full size spare is always best (and you can even rotate it through with your other tires when you do rotations if you'd like). But for other uses, having a spare that you actually carry (instead of leaving home because it was too big), and that isn't a "tiny doughnut" might work out great.

Guess we'll have to see how this gets implemented.

Thanks for the insight :).
 
Yeah, running long term with a spare that is undersized, will create additional wear and tear (at very least on the tire).

For the context of a space saver sort of spare tire, thats probably ok, as its not really intended to be a normal everyday tire, just enough that it can get you out of dodge if something goes wrong (better than a patch kit).

For "actual" offroading, a full size spare is always best (and you can even rotate it through with your other tires when you do rotations if you'd like). But for other uses, having a spare that you actually carry (instead of leaving home because it was too big), and that isn't a "tiny doughnut" might work out great.

Guess we'll have to see how this gets implemented.

Thanks for the insight :).
I won’t let them rotate my spare in. It needs to stay pretty.
 
Well now I have another question. If you don’t want to remove the tire carrier is the license plate going to still be on the left?

I have so many questions!

I know, I know I have to stick to my motto. Faith and patience.

Still somewhat fluid, but because the rear tire could obstruct the view of the license plate if mounted on the bumper, we will likely mount the plate on the carrier itself on the left side. Let's see how things go between now and production.

Jamie