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      03-12-2013, 09:57 PM   #1
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255 vs 265 Width on a non M

It's nearly time to purchase tires for my EC7s coming in. I've had both rear sizes recommended; 255/35/18 and 265/35/18 with diameters of 25.028" and 25.303" relative to those sizes. On a non-M would there be a potential issue with rubbing on the slightly larger size or would it be wise to play it safe with the smaller size? APEX suggested it could rub and I trust their judgement, but wanted to see if anyone had experience with these. Also, it will be lowered with Eibach Pro Kit springs and Bilstein HD dampers.

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Last edited by ANUSTART; 03-13-2013 at 07:43 AM..
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      03-13-2013, 10:18 AM   #2
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Quote:
Originally Posted by hogzilla View Post
It's nearly time to purchase tires for my EC7s coming in. I've had both rear sizes recommended; 255/35/18 and 265/35/18 with diameters of 25.028" and 25.303" relative to those sizes. On a non-M would there be a potential issue with rubbing on the slightly larger size or would it be wise to play it safe with the smaller size? APEX suggested it could rub and I trust their judgement, but wanted to see if anyone had experience with these. Also, it will be lowered with Eibach Pro Kit springs and Bilstein HD dampers.

Thanks!
What's your wheel size? What are you running in the fronts? I would only run 265 in the rear if you were running 235 front to keep the ride height same -- and that's assuming 235's up front won't rub.

Assuming your rim width is 8.5-9.5", stick with 255. May as well play it safe.
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      03-13-2013, 10:38 AM   #3
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^ That is exactly right. Running 8.5 front and 9.5 rear. 235/40/18 on the front. 255 would be the safe bet. However, 265 would be nearly identical in tire diameter since a 235/40/18 is 25.402". To take it a step further, could go 225/40/18 on the front. Darn math.
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      04-07-2013, 08:50 AM   #4
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Quote:
Originally Posted by hogzilla View Post
^ That is exactly right. Running 8.5 front and 9.5 rear. 235/40/18 on the front. 255 would be the safe bet. However, 265 would be nearly identical in tire diameter since a 235/40/18 is 25.402". To take it a step further, could go 225/40/18 on the front. Darn math.
You have bigger risk of rubbing on fronts with 235 than 265's in the rear. What are the offsets?
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      04-07-2013, 10:49 AM   #5
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Went with 225 front and 255 rear and it turned out great. Still on stock springs but doesn't appear it will rub even when dropped an inch. Thrilled with these PSSs.
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      04-07-2013, 01:12 PM   #6
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Good to hear, I went with

225/35ZR-19 Front
and
265/30ZR-19 on the Rear

The rears are great, the fronts I think rub just a touch if I really push it, something like a speed bump near full lock.

When I get the next set I'm going to see if I may have some more room for a step up on the rear.
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      04-30-2013, 01:04 AM   #7
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But has anyone tried the rear M size for non M-car (for example E86 3.0si)? 255/40R18 on a stock 18x8.5 non M-wheel. Any rubbing?
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      04-30-2013, 05:07 AM   #8
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I have the opposite - 255/35/18 on M style 224 rims on my 3.0si - wouldn't dare to try 255/40 on this rim as it's really close to rub the outer fenders.
Will be fitting my kw v2's sometime next week - probably will be hard to set it without rubbing.
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      04-30-2013, 10:14 AM   #9
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Quote:
Originally Posted by McKoval View Post
I have the opposite - 255/35/18 on M style 224 rims on my 3.0si - wouldn't dare to try 255/40 on this rim as it's really close to rub the outer fenders.
Will be fitting my kw v2's sometime next week - probably will be hard to set it without rubbing.
McKoval, could it be the offset of the 224 rear rims possibly? I'm running the same size tires with the APEX EC-7s and it fits like a glove. However, I'm running stock suspension so there's plenty of room. But even dropping it an inch it should tuck nicely.
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      05-06-2013, 06:15 PM   #10
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Running 265/35-18 on 18x9.5" OZ square on our race car. Not rubbing lowered on TC Kline C/Os.
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      05-06-2013, 08:56 PM   #11
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That is crazy! Did you need to do a fender roll on it? Very cool!
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      05-07-2013, 09:31 AM   #12
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Quote:
Originally Posted by Messiah9000 View Post
But has anyone tried the rear M size for non M-car (for example E86 3.0si)? 255/40R18 on a stock 18x8.5 non M-wheel. Any rubbing?
I ran a 255/40/18 winter tires on my Z4 3.0 si Coupe (type 203 i think) wheels. BTW I am lowered on coilovers so that may affect the camber which may prevent some rubbing.

Last edited by CJW2OO4; 05-07-2013 at 10:07 AM..
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