Tire fitment issues in the rear

[ZDan]

Originally Posted by MyHybridBurnsGasAndTires

from this guy's instagram, he said he was on 265/35r18 on 9.5 in wheels with +45 offset and 15mm spacers, but he didnt say if the spacers were front/rear or both.

With spacers, effective offset +30, those tires are poking out 43mm vs. stock, *and* they are 0.6" (15mm) larger in diameter which ain't helpin'...

There are regulations requiring massive clearance for wheels/tires which account for oversized tires. If the new model has less clearance for rear tires, I'm betting we'll still be able to fit 245s without too much trouble. Guess we'll have to see about +35 offsets tho...

[trippinbillies40]

Sorry for chiming in late here. Been stupid busy. So with 13" hub center to fender, I'm now getting very very minimal rubbing on large bumps on the road. At Crows Landing for an autocross, didn't rub once. That's big load on a bumpy surface. So if it doesn't rub there, it's not going to rub on a race track unless I'm pounding over a big curb.

[ZDan]

Originally Posted by trippinbillies40

Sorry for chiming in late here. Been stupid busy. So with 13" hub center to fender, I'm now getting very very minimal rubbing on large bumps on the road. At Crows Landing for an autocross, didn't rub once. That's big load on a bumpy surface. So if it doesn't rub there, it's not going to rub on a race track unless I'm pounding over a big curb.

What tire size and wheel size/offset?

[trippinbillies40]

Sorry, thought that had been beaten to death. 17x9+45 with 255/40/17 A052s.

[ZDan]

Originally Posted by trippinbillies40

Sorry, thought that had been beaten to death. 17x9+45 with 255/40/17 A052s.

Wanted to eliminate possibility of somebody being mistaken!

Hmmm, seems like for 17x9 +35 wheels, best bet is gonna be 225/45-17 or maybe 235/40-17...

[timurrrr]

Originally Posted by ZDan

Hmmm, seems like for 17x9 +35 wheels, best bet is gonna be 225/45-17 or maybe 235/40-17...

Could be that Subaru engineers saw your posts about reverse stagger and thought it was a good idea!

[timurrrr]

Originally Posted by trippinbillies40

Sorry for chiming in late here. Been stupid busy. So with 13" hub center to fender, I'm now getting very very minimal rubbing on large bumps on the road. At Crows Landing for an autocross, didn't rub once. That's big load on a bumpy surface. So if it doesn't rub there, it's not going to rub on a race track unless I'm pounding over a big curb.

Can you post pictures on where exactly it rubs?

Curious how many mm should the suspension be compressed for the tire to reach that spot. I remember you told me you have 8k springs in the rear.
Perhaps with 9k or 10k springs and slightly higher ride height and different coilovers one could set bump travel in such a way that the suspension just can't move that much for the tire to reach that spot, even with et35 wheels.

[trippinbillies40]

I honestly don't know where it rubs yet. I haven't had enough time to dig into it.

[Dylans47]

Sorry I'm not familiar with the typical offset for the previous gen 86. Was 17x9 +35 one of the go tos to make the wheel flush with the fender? If so then a 17x9 +45 might look sunk in...

Reading into other threads, 17x9+45 leads to issues with inner fender well rubbing in the front, while 17x9+35 was great. Now +35 leads to rubbing in the rear! So some kind of rubbing will be present unless ride height, spring rate, etc are played with. Can't understand how this happened. Overlooked by both Subaru and Toyota? There has to be reasoning, right?

[trippinbillies40]

First, anything you're reading is from me. To my knowledge, nobody else is lowered and fitting meaty tires. Mike is working on this too but not sure he's tried as aggressive as I have.

Second, Subaru and Toyota definitely do not account for lowered cars with wide tires when making designs lol.

Finally, I have some pretty damn wide tires on. All tires are not sized equally from brand to brand. 255 wide Yokohamas are very wide compared to 255 wide tires in some other brands. There's a ton at play here including ride height and camber. It's literally one car, everyone can calm down, we'll get it figured out!

[timurrrr]

Originally Posted by Dylans47

Was 17x9 +35 one of the go tos to make the wheel flush with the fender?

I have 17x9 +37, the rear are flush at -2.5º camber and the fronts are somewhat sunken in at ~-3.2º camber.
+35 was a common combo indeed, but in the rear it probably poked slightly with stock RLCAs.

Originally Posted by Dylans47

Reading into other threads, 17x9+45 leads to issues with inner fender well rubbing in the front

Yup

Originally Posted by Dylans47

while 17x9+35 was great.

Depends on the tire size, camber, possibly other factors.
I've managed to scratch some paint off the chassis with +37 wheels and 245/40R17 tires in the front at -3.0º camber.

Originally Posted by Dylans47

Now +35 leads to rubbing in the rear!

Yes, possibly

Originally Posted by Dylans47

So some kind of rubbing will be present unless ride height, spring rate, etc are played with.

Another option is using different offset wheels in the front vs rear.
Or et45 wheels everywhere and 10mm spacers in the front. (Good call, @trippinbillies40!)

Originally Posted by trippinbillies40

Subaru and Toyota definitely do not account for lowered cars with wide tires when making designs lol.

So much for the GR badge on those 86's
Seriously though, they know about the aftermarket around these cars, they worked with many of tuners pre-release, why would they make things worse?

Originally Posted by trippinbillies40

Finally, I have some pretty damn wide tires on. All tires are not sized equally from brand to brand. 255 wide Yokohamas are very wide compared to 255 wide tires in some other brands. There's a ton at play here including ride height and camber. It's literally one car, everyone can calm down, we'll get it figured out!

True, but also people used to run much wider than 255 on 1st gens before.
And judging by how the wheel is positioned, even 245 from "narrower brands" are likely to poke quite a bit at stock camber on +40ish offset wheels

I really hope our initial data points were wrong and/or misinterpreted and there are in fact no issues.

[ZDan]

Originally Posted by timurrrr

I have 17x9 +37, the rear are flush at -2.5º camber and the fronts are somewhat sunken in at ~-3.2º camber.
+35 was a common combo indeed, but in the rear it probably poked slightly with stock RLCAs.

Not if lowered sufficiently...

245/40-17 on 17x9 +35, just under 13" hub to fender lip all 4 corners, stock control arms, camber plates, -3.25 front -2.7 rear camber.

[timurrrr]

Originally Posted by ZDan

Not if lowered sufficiently...

Ah, true — my car is lowered less than average.

Can you take a photo of the fitment from above the wheel, and slightly inboard?
Before I dialed in -2.5º of camber, I could find a spot where the top of the wheel would fully cover the bottom of the wheel, but was still visible from under the fender.

[ZDan]

Originally Posted by timurrrr

Ah, true — my car is lowered less than average.

Can you take a photo of the fitment from above the wheel, and slightly inboard?

I can tomorrow. Friggin dark out in RI right now! I can see four planets and the moon tho so that's nice...

Before I dialed in -2.5º of camber, I could find a spot where the top of the wheel would fully cover the bottom of the wheel, but was still visible from under the fender.

I'm totally covered