Newbie Tire size question - 986 Forum - The Community for Porsche Boxster & Cayman Owners

NickCats · 05-13-2008, 12:31 PM

Addiction,

My autocross buddy just put 245/275 setup on his 17" x 8.5" stock wheels.

( I believe he went with Kumho Ecsta V710's )

He is not running spacers and they seem to fit fine :

http://986forum.com/forums/showthread.php?t=15609&page=1&pp=20

( see Sammy's posts )

Hope this helps...

Nick

AddictionRacing · 05-13-2008, 01:05 PM

Thanks Nick - That is very helpful. Eventually I'll get a 2nd set of wheels with R-comps, but first I need to unload the old car (Jetta) along with the 5 sets of wheels I've accumulated for it.

Wingnut2u · 05-13-2008, 02:24 PM

I am running 275/35/18 on mine but I am not on stock, I have 18x10.5 on the rear. 275's work but you may need to roll the fender if you decide to drop the car

TriGem2k · 05-13-2008, 02:32 PM

I think a 275 will be a little sloppy on a 8.5" wheel.

Sammy · 05-13-2008, 03:07 PM

I'm running a 245/275 setup with Kuhmo V710's on 17x8.5" wheels. The 275 is a stretch for the 8.5" rim but I am truly impressed with the difference in handling. OMG does the car stick! I don't use spacers but it is a tight fit in the front. The rear could be spaced out a little but I'm not planning to do this because I'm thoroughly impressed with the handling at this point.

AddictionRacing · 05-13-2008, 03:47 PM

Quote:

Originally Posted by Sammy

I'm running a 245/275 setup with Kuhmo V710's on 17x8.5" wheels. The 275 is a stretch for the 8.5" rim but I am truly impressed with the difference in handling. OMG does the car stick! I don't use spacers but it is a tight fit in the front. The rear could be spaced out a little but I'm not planning to do this because I'm thoroughly impressed with the handling at this point.

Do you have 8.5" all the way around or are the fronts still 7.5"? It sounds like I should try the 245/ 275 set-up. Thanks for the help, and please keep it coming if you have a different opinion. Once I make my decision and get them mounted up I'll share the results.

kyle986driver · 05-13-2008, 04:31 PM

From my experience with 205/16 and 245/16 hankook RS2s, I wish I had done equal wheel and tire sizes all around. For me, I dont have a HUGE selection of matching tires, and few R-comps are made.

I believe most of the national guys run equal sizes.

hope that helps.

Sammy · 05-13-2008, 05:28 PM

Quote:

Originally Posted by AddictionRacing

Do you have 8.5" all the way around or are the fronts still 7.5"? It sounds like I should try the 245/ 275 set-up. Thanks for the help, and please keep it coming if you have a different opinion. Once I make my decision and get them mounted up I'll share the results.

I have 8.5" all the way around. I'm not sure a 245 will fit on a 7" wheel but do some searching to find out if anyone has done this? You might also search the following site:

http://boxcar-racing.com/forum/index.php?PHPSESSID=16734c86c80c5b091424f4403ffd2c 66&

In terms of grip I found that between the new tires (granted it could be the compound of the V710's) and the lower stress bar I was dead even with a couple guys that I was 2-3 seconds behind last year. It was a little weird getting use to virtually full throttle through the slaloms. The car was very neutral and much more predictable than before (of course this could be my driving style?).