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Discussion Starter #1
Hey everyone, I am new to the R8 community! Picking up my 2017 R8 Plus from the current owner this weekend and I am pumped. I live in Chicago, and daily my cars with winter tires when it snows. I have a basically new set of Pirelli snow tires from my old car, and I was curious to know what the max tire size is that will fit on the stock 20" rims. The size of my tires is 285/30/20 on all four corners. How does the R8 do with a squared setup? Anybody run it? I always have run square setups on my 4WD cars and it increased handling capabilities dramatically. Hoping its the same with the R8. If the 285s don't fit on the stock wheels, than what is the max width and offset allowed on the front end of an R8? Will it handle 20x10s in the front with 285 rubber?

Worst case, I have to sell these and get another set of wheels and tires entirely. They are almost new and cost quite a bit, so I was hoping to salvage them!

I appreciate any input.
 

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I know on a stock gen 1 car 265 will NOT fit.
 

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The Gen 2 has a staggered rolling diameter difference baked into the Quattro system. I wouldn’t deviate too much from that differential. Running a square setup is likely to end badly and expensively. I daily my Gen 2 in philly area. I run the stock 20’s (245F, 305R) with dedicated snows for winter and a set of custom 19’s for all other times. I’m running 255F and 345R without any issues.


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Congrats!! I was running 235/295 on the 991.2 911 for the chicago winter. I dont plan on dailying the R8 since last winter was brutal. If youre gonna drive in deep snow obviously narrower is better (as are 19s for pothole protection). With respect to summers, I personally wouldnt go past 245 up front (maybe 255) as it might kill steering feel, and if youre gonna go past 305 in rear for max corner grip you might consider wider wheels, as the stock rims are only 11’’ wide and it could feel squiggy with that much rubber on the rim. If you upgrade to 11.5 or 12’’ wide rear rims you can go much wider like 315-325 (or more). Make sure the rolling diameter difference is close Stock F to R and check woth your service guys because they can be A holes about everything
 

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For the front 20x8.5 OEM wheels, with a 30 profile, 255 is the widest that Michelins/Pirellis/Continentals are spec'd out for.

For the rear 20x11 OEM wheels, with a 30 profile, 325 would still be in manufacturer spec.
With a 25 profile, 315 would be the widest possible within spec for the rears.

You'll certainly have more options with rears that are 11.5" or wider.
 

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Discussion Starter #10
I did a size comparison and between the stock 305/30/20 tires on the car and my spare 285/35/20 snow tires, the diameter difference is 2.6%. From what I've read, as long as the difference is kept under 3.3% the Quattro system should be fine. I know that a 285 tire fits on an 11" wide wheel without issue, so do you guys think I could run that on the rears? If so, would you recommend i use the same ratio of 2.6% difference on the fronts as well? Like a 235/35/20 on the front would produce a 2.7% difference, so front to back should be spot on. Thoughts?
 

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Discussion Starter #12
My plan is to go 235/285 like you state except with michelin AS3+ For cold/winter. Im not taking it out when its chernobyl outside. But i can run these oct-apr if i wanted.
Okay that's what I thought. Yea I plan on doing the same. Thanks man.
 

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This would be for the stock 19s. For the 20s i think they have bigger sizes like 295 in back but havent checked. I was running 235/295 on my porsche with 8.5 front and 11 rear
I'm running:
20 x 12 + 51 w/345/25
20 x 8.5 + 37 w/255/30

and

19 x 12 + 54 w/325/30
19 x 9 + 44 w/255/35

I have zero clearance issues with either setup.
 

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I'm running:
20 x 12 + 51 w/345/25
20 x 8.5 + 37 w/255/30

and

19 x 12 + 54 w/325/30
19 x 9 + 44 w/255/35

I have zero clearance issues with either setup.
Nice! If you have so pics that would be awesome! Where did u find 20x12+51? Custom? Im only finding offsets in 30s n 40s. The skinny tires i posted above would be for winter
 

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Discussion Starter #20
Far better than 235 or 245.
I've always been a big fan of getting big tires on the front. I had 285's on my GTR up front and it was unreal. To me, the steering was amazing. The Audi R8 with dynamic steering feels to light to me as is, so I wouldn't mind a heavier feel of a 255 up front.
 
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