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Anyone running 265-40-17 on a 9.5?

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Old Jun 2, 2010 | 01:15 PM
  #1  
berns's Avatar
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Anyone running 265-40-17 on a 9.5?

Recently picked up 18x9's with 255/35's, but I'm looking to go back to a 17" wheel.

I'll be doing 17x9.5 RPF1's, +18 front +38 rear and am just debating between a 255-40 or 265-40. I'm not too low and am running Robispec kw clubsports, so it's a stiff setup. Around -2 degrees up front and -1.5 in the rear, just wondering if I'm going to run into some major fender issues with a 265 or not. The rears will be rolled, but I don't want to have to pull at all.

Thanks. And if you have pics of a similar setup, please post up. I searched and only found most people running a 255.
Old Jun 2, 2010 | 01:19 PM
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There are others running that size with rolled fenders. Tire size fits wheels 9.00 to 10.50" so 9.5" fine.
Old Jun 3, 2010 | 08:21 PM
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Im running 18x9.5 +22 all around with 265-35-18 and my rears do NOT clear. I didnt just roll the fender, but cut everything out so there is no lip at all. Also cut out the bracket for the bumper and all that. At +38 you should be fine with a roll i think. My 17x8.5 +30 on 255-40 was ok with a roll.
Old Jun 4, 2010 | 07:36 AM
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I've got 255's on my 17x9.5" wheels with a +35 offset and 15mm spacer in front on Swift Spec R. Never rubbed one bit so I'm really tempted to try the 265 next time, I cant imagine needing any more than a mild rear fender roll.
Old Jun 4, 2010 | 10:12 AM
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Also the 265 is closer to OEM O/D... the 255 is smaller, therefore not only is your speedo off, but you are covering less ground on each revolution.
Old Jun 4, 2010 | 11:48 AM
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Originally Posted by Bassicfun
Also the 265 is closer to OEM O/D... the 255 is smaller, therefore not only is your speedo off, but you are covering less ground on each revolution.
When racing, a small difference in diameter can mean the difference between bouncing off of the rev limiter or not before entering a turn. Driving on the street, however the difference in diameter is pretty insignificant, 25.4" vs. 25" (1.6%) so at 65mph your speedo will read 66. Consider also the 9/32 tread depth of the stock tires, if you were to wear them down to 1/32 (extreme, but it's been done) they would be 24.9" diameter.
Old Jun 4, 2010 | 11:59 AM
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Originally Posted by sscottttt
When racing, a small difference in diameter can mean the difference between bouncing off of the rev limiter or not before entering a turn. Driving on the street, however the difference in diameter is pretty insignificant, 25.4" vs. 25" (1.6%) so at 65mph your speedo will read 66. Consider also the 9/32 tread depth of the stock tires, if you were to wear them down to 1/32 (extreme, but it's been done) they would be 24.9" diameter.
Not to hijack a thread, I think we are arguing the same point, that the 265 is the better bet, being larger O/D than the 255, plus more contact patch.
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