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      11-03-2012, 02:30 PM   #1
mchaoster
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Tire spec for performance suspension

hi everyone,

i have 10k miles on my run-craps and they already need to be replaced. i'm set on the michelin pilot super sports. my question is what size/spec should i get? i have a 2012 135i with M-package and the performance suspension (prefer no rubbing of course).

original equipment:

Front: 215/40R18
Run Flat
Sidewall Style: Blackwall
Serv. Desc: 85Y

Rear: 245/35R18
Run Flat
Sidewall Style: Blackwall

are these the ones to get? should i go up in size and what about the sidewall or load range ratings?

Front: 215/40ZR18
Sidewall Style: Blackwall
Serv. Desc: (89Y)
Load Range: XL

Rear: 245/35ZR18
Sidewall Style: Blackwall
Serv. Desc: (92Y)
Load Range: XL

Thanks in advance for your suggestions!

Michael
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      11-07-2012, 12:07 AM   #2
John_01
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I'd recommend going up one size to 225/40/18 on the front. The rear can also go to 255/35/18 without any issues at all.
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      11-08-2012, 03:30 PM   #3
Kim Schwartz
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Quote:
Originally Posted by John_01 View Post
I'd recommend going up one size to 225/40/18 on the front. The rear can also go to 255/35/18 without any issues at all.
I've thought of doing something like that but then the rolling diameter of the fronts is bigger than the rears. Does that matter? It isn't a big deal but I ask anyway.
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      11-08-2012, 05:16 PM   #4
blutattoo
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I use to have 235/40/18 fronts 265/35/18 rear PSS with no clearance issues on Apex wheels so I think with stock you can go to that size if you want.

I loved the PSS for the track and street, but auto crossing shredded the outside edge of the tires since I had no camber kit at the time. Fitment was perfect and I never rubbed so you can go wide if you want.
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      11-08-2012, 05:21 PM   #5
syenisch
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I have PS with 261 style stock wheels and have run 235 in the front on Star Specs and PSS's with no problems whatsoever on track and street.
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      11-08-2012, 05:52 PM   #6
Stohlen
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Quote:
Originally Posted by blutattoo View Post
I use to have 235/40/18 fronts 265/35/18 rear PSS with no clearance issues on Apex wheels so I think with stock you can go to that size if you want.
Agreed... No rubbing so why not go for the better traction?
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      11-08-2012, 08:03 PM   #7
GaryS
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Because it causes sidewall flex, 225/255 will slightly increase ride comfort and slightly decrease handling sharpness. Most people on this forum seem to like it.
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