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GR86 General Topics (2nd Gen 2022+ Toyota 86) General topics for the GR86 second-gen 86


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Old 04-14-2024, 11:15 PM   #15
briang0901
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Originally Posted by gkubed View Post
Do you know if the Styrofoam placeholder out of the '24 models fits well on the first gens? The OEM spare doesn't fit over my brakes, so no sense in lugging it around. It would be nice to have an OEM solution to filling that gap though.
Do you still have your spare?
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Old 04-16-2024, 10:51 AM   #16
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planned on salvaging my spare from gen 1 when I move to gen 2. no timeline on that tho. pickins are still slim
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Old 04-22-2024, 06:13 PM   #17
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Originally Posted by ruturaj001 View Post
Regular spare
Spare Foam Spacer: 52153PA181
My 2017 '86 has no foam spacer under the tire. Toyota's owners manuals seem to bear this out; the later versions that cover TRD edition, they show the foam spacer only for cars that have a 17" spare wheel, while 16" spares do not have it. I haven't checked Subaru's equivalents, but expect they would be the same.

The parts diagrams I see for this part number seem to indicate it's a sheet metal 'volcano' that's spot-welded into the bottom of the spare tire well to provide the nut the retain bolt threads into. Presumably they wanted this nut higher to allow a shorter bolt for more accurate positioning. It's shown on the same figure as other sheet metal components forming the trunk compartment.

The need for the spacer isn't so much for the respective tires being 16" and 17", but rather that the 17" rim for Brembo brakes is domed out much more to clear the brakes. So with the tire (rubber) resting on the trunk floor, the centre of the Brembo spare wheel would have to poke through the floor while the regular spare doesn't. The spacer is to bring everything up with the Brembo spare.

Odd observation: between the 16" and 17" spare wheels, the 16" is a closer match to stock 17" tires' effective diameter. The 17" spare wheel is the closer match to the stock 16" (JDM, Australian, China, maybe other makets) tires.

Additionally, the 17" spare from other Subaru models might not necessarily work. I'm thinking specifically of the spare for Brembo-equipped WRXes; some people assume since the WRX has Brembo calipers, the spare must work for BRZs with Brembos too. However, what they're missing is that the instructions for the WRX are to put the spare wheel on the rear, and install the fuse that puts the car into FWD mode. I imagine its the same story with other AWD Subarus.

So unless somebody has a way to put their BRZ into FWD mode, I wouldn't simply conclude some other Subaru wheel works. It might anyway, it might not, but you really need to test fit to know for certain, and not just deduce that it does.

Last edited by Luns; 04-22-2024 at 06:24 PM.
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Old 04-23-2024, 06:02 PM   #18
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Originally Posted by Luns View Post
My 2017 '86 has no foam spacer under the tire. Toyota's owners manuals seem to bear this out; the later versions that cover TRD edition, they show the foam spacer only for cars that have a 17" spare wheel, while 16" spares do not have it. I haven't checked Subaru's equivalents, but expect they would be the same.

The parts diagrams I see for this part number seem to indicate it's a sheet metal 'volcano' that's spot-welded into the bottom of the spare tire well to provide the nut the retain bolt threads into. Presumably they wanted this nut higher to allow a shorter bolt for more accurate positioning. It's shown on the same figure as other sheet metal components forming the trunk compartment.

The need for the spacer isn't so much for the respective tires being 16" and 17", but rather that the 17" rim for Brembo brakes is domed out much more to clear the brakes. So with the tire (rubber) resting on the trunk floor, the centre of the Brembo spare wheel would have to poke through the floor while the regular spare doesn't. The spacer is to bring everything up with the Brembo spare.

Odd observation: between the 16" and 17" spare wheels, the 16" is a closer match to stock 17" tires' effective diameter. The 17" spare wheel is the closer match to the stock 16" (JDM, Australian, China, maybe other makets) tires.

Additionally, the 17" spare from other Subaru models might not necessarily work. I'm thinking specifically of the spare for Brembo-equipped WRXes; some people assume since the WRX has Brembo calipers, the spare must work for BRZs with Brembos too. However, what they're missing is that the instructions for the WRX are to put the spare wheel on the rear, and install the fuse that puts the car into FWD mode. I imagine its the same story with other AWD Subarus.

So unless somebody has a way to put their BRZ into FWD mode, I wouldn't simply conclude some other Subaru wheel works. It might anyway, it might not, but you really need to test fit to know for certain, and not just deduce that it does.
Thanks, I was pretty sure I would get PP installed or upgrade to car with PP sometime down the line, I didn't put that much effort in to writing and researching 16" wheels.
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Old 04-25-2024, 10:54 AM   #19
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Originally Posted by ruturaj001 View Post
You never install spare in rear. If rear has puncture then you have to put spare in front and install front in rear.
Curious what the reasoning is behind your statement? Is this in the manual for the 86's? Is it about the difference in tire circumference and therefore difference in wheel speed left to right on the driven axle causing issues with the limited slip diff?

Not trying to be an A$$, but unless specified in the manual for some specific reason I think this is incorrect, and potentially dangerous advise from a driving dynamics standpoint.

Since the front tires handle much higher loads from braking, turning and usually carry the higher percentage of a vehicle's weight (since the engine is generally in the front), it is best NOT to install a temporary spare on the front.

I've always been under the impression if you get a flat on the front, that it is best to move a rear tire to the front, and install the temporary spare on the back.

As long as you are not trying to accelerate swiftly, or drive aggressively, with a temporary spare on the back of a RWD car, the small temporary spare is better suited to the loads the rear wheels will encounter.

And, although most seem to ignore it, it is best to remember that a temporary spare is only meant to get you off the highway and to a repair facility, not to drive around on for days (or more) till you repair or replace the damaged tire.

EDIT: Gen 2 cars don't come with spare tires, so there is no mention in the manual. Owners manual for Gen 1 cars does indicate to "Install the compact spare tire on a front wheel." as OP has noted. Have to assume this is because the temporary spare is of a smaller diameter, and the concern for wheel speed difference possibly damaging the limited slip diff.

When I'm wrong, I'll admit I'm wrong, but for those with other cars, know this is not a general rule of thumb for all vehicles, check your manual.
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Last edited by LRNAD90; 04-25-2024 at 11:20 AM.
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Old 04-25-2024, 02:53 PM   #20
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Originally Posted by LRNAD90 View Post
When I'm wrong, I'll admit I'm wrong, but for those with other cars, know this is not a general rule of thumb for all vehicles, check your manual.
Good advice.

That said, it is a general rule of thumb for vehicles that have limited slip differentials to not run spacesaver wheels where the differential is. (Note that there are front wheel drive vehicles with limited slip transaxles, so sometimes you do not put them on the front...).

Any difference in circumference (larger or smaller) between the wheels connected to a limited slip differential has the potential to cause damage:

For clutch type differentials it will wear out the clutches.

For all types of limited slip it will generate additional heat and can lead to breakdown of the oil.
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Old 04-25-2024, 06:16 PM   #21
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EDIT: Owners manual for Gen 1 cars does indicate to "Install the compact spare tire on a front wheel." as OP has noted. Have to assume this is because the temporary spare is of a smaller diameter, and the concern for wheel speed difference possibly damaging the limited slip diff.
I've been told it can also make the traction and braking nannies freak out.
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Old 05-01-2024, 09:55 PM   #22
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Yes, previous gen PP came with 17" spare and 18" wheels.

You never install spare in rear. If rear has puncture then you have to put spare in front and install front in rear.

Do you or anyone know which side of the Yokohama t145/70d17 is inside and quick outside (or are they symmetrical)?
Last time Mavis did it wrong and I had to remind them.


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Old 05-02-2024, 11:55 AM   #23
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Do you or anyone know which side of the Yokohama t145/70d17 is inside and quick outside (or are they symmetrical)?
Last time Mavis did it wrong and I had to remind them.


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Got everything done

Thanks for everyone helping here!




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Old 05-03-2024, 02:20 AM   #24
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GR86s have never had a spare provided in Australia, it was launched here with a can of goo.

The BRZ Coupe (base) and Coupe S (premium, but really just heated seats) in Australia both have a full size spare wheel in the boot, which for many of us is a point in the BRZ's favour.

Weirdly, probably as a cost and/or weight savings tactic, the BRZ tS here loses the spare wheel, which seems a bit crummy.
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Old 05-03-2024, 12:17 PM   #25
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Perhaps a little off-topic... I think a plug-kit + pump + jack/wrench is the best combo for these cars. Just remove the tire, plug it, inflate, then re-mount. Easy peasy. (And there appears to be a cosmic rule that one will not have a flat if properly prepared for it.)
I get where you're coming from on this, but this assumes you still have a tire to work with after it fails. If the tire ruptured or otherwise shredded apart, or gets a hole that's not in the tread area, then there's nothing to patch. So when it comes to an actual spare tire I'd rather always have it and never need it than need it and not have it. If I can patch a tire I will, but if it can't be done then at least I have a spare ready to go and keep me moving to where I can get another tire.

I do wish I could fit a full size spare in the space in the trunk, that would be ideal.
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Old 05-05-2024, 06:29 PM   #26
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I hear you Overdrive... Must have had about 20 flats in my lifetime, all were nails/screws that could be pulled and plugged. The only side-wall puncture I saw was done to someone else with a knife (I think) and afflicted all 4 tires. Having said all that, I am as paranoid as you are. So I also have a spare doughnut in the trunk... I mean why not :-)
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Old 05-05-2024, 09:31 PM   #27
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Yep, I've been there with no spare tire, for 88,000 miles in a Miata.

Never had a flat tire on the road. Each morning before leaving the motel, I would check the tires and tire pressure.

However, I will admit, that I do feel better, having a spare tire, with my FR-S.

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