Sorry, forgot to ask, but the tires I want are ina 275/40...what offset would I need to run these on a 17"? Would they rub?

 

What kind of car?

 

275? Thats an odd size. 35 series would be better on an FD 265 40 or 285 35 is better.

 

Really depends on the rim...but I would say something in the mid 40's..
I was running 275x40x17 with OZ monte carlos with a offset of 45..no issues what so ever

 

It's an FD. 17x9.5" rims.

What exactly is the offset? what does a higher number mean?

 

Check out http://www.tirerack.com/wheels/tech/wheeltech.htm . They'll give you a great explanation.

 

I tried to run 275-40-17 A032R's on my SSR Comps 17x9.5 +42

The tire was real close to the rear fender lip. It looked like it would hit unless I rolled the fenders or increased the camber to at least -2 deg or mabey even both. I went with 255's instead.

I am looking into how I can get 275's to work by the time I am ready for new tires. It seems like it would be better to have +45 or higher offset to run 275's. I know people are running 275's with 9.5 +40 & +42 so mabey I only had a problem because the A032R's run wider than some other tires.

If any one else is running 275's with 9.5 +42 or less, without rolled fenders please let me know what camber settings are bieng used and which model of tire you have.

 

Previous set of wheels, 275/35/18 Kumho Ecsta Supra on 18X9.5 +43, rear - camber within factory specs (sorry, forgot exact). No fender rolling, no rubbing.

Also, offset and wheel width must be taken into account at the same time. An 18X8.5 +40 and a 18X10 +40 will sit very different within a wheel well.

New set of wheels (arriving next couple days, YEA!), 285/30/18 Pirelli P Zeros (regular), rear on 18X10 +44.

I'll let you know how it fits...

 

Lunar,
Are you running 255 on 17x9.5" up front too? Any problems with rubbing? An ideal setup would be 255/40/17 all around, because it maintains the stock rolling diameter and width balance. Anyone else able to get this to work w/o rubbing on a stock suspension?

 

Nathan;

I have 235-40-17 on 17x8.5 +42 up front.
I apreciate the smaller diameter up front because I am experiencing very very slight rubbing in the top center of the wheel wells. This very slight rubbing only occours during very high G brake turning on the track or autocross. Raising my coilovers and stifening my shocks cured about 98% of the rubbing. I imagine an upgraded swaybar might help to reduce it further.

I agree that 255's all around would be nice, since taller 275's on the rear can hurt aceleration (from a roll). As for the stock rolling diameter and width balance 235-45-17 and 255-40-17 are now the stock sizes on 99+ RS models.

 

I have pretty much what the rest is running. 325/40/17 up front(43) and 275/40/17 (38). Im not sure about the offset(front or rear. which is which) but I have absolutely no rubbing whatsoever! H&R springs lowered the car about 1.75". on factory settings... may get an alignment in spring though

 

thats 235 for front sorry.

 

I have 275/40/17 Blitz wheels for my 7. They are the rears, though. (17x9) The fronts I run 17x8's. If you go any wider than 9 in the front, they may rub unless you go with a really low profile.