Tire size for 18x10 C. lightweight - 986 Forum - The Community for Porsche Boxster & Cayman Owners

timothy · 08-01-2007, 06:32 AM

About to buy Carrera Lightweights from Wheel Dynamics, size 18x8 & 18x10, and need some advice on the best tire size with Goodyear F1 G3-D3. I'm still a newbie when it comes to tires.

Is the best choice 225/40/18 and 265/35/18, or do I go with something wider on a 10" wheel? Tire Rack shows other available sizes 275/35(or 40)/18 and 285/35/18. 03 and my daily driver. At this point no auto-x but I do like a spirited drive after a long day at the office. Thanks!

insite · 08-01-2007, 08:11 AM

i'd go with a 245/35 up front and 265/35 in back. the 285's get expensive and add to the understeer. the 245 / 265 combination is really neutral.

RandallNeighbour · 08-01-2007, 08:54 AM

Adding some 5mm or 7mm spacers in the back will heighten the aggressive stance of your boxster. I did it when I bought the same rims.

http://www.iwantaporsche.net/TOD/PICT0278.JPG

Adam · 08-01-2007, 09:02 AM

265's are pretty skinny for a 10" wide wheel. 265's are meant for a 9" wide wheel. Might look kind of funny or provide funky wear/handling issues....I would go to at least 275's, but 285's is usually the width you want with a 10 in wheel. You might get some more understeer though as Insite mentioned, but are you tracking the car? If not that would be a non-issue.

timothy · 08-01-2007, 09:36 AM

Seems when it comes to tire fitment everyone has a different opinion. I am not tracking the car but might try sometime.

So far nobody disagreed with 245/35 up front. Maybe 275 is a compromise on the rear. Is that a 275/35 or 275/40? Still open to other opinions. Thanks.

Adam · 08-01-2007, 09:59 AM

Quote:

Originally Posted by timothy

Seems when it comes to tire fitment everyone has a different opinion. I am not tracking the car but might try sometime.

So far nobody disagreed with 245/35 up front. Maybe 275 is a compromise on the rear. Is that a 275/35 or 275/40? Still open to other opinions. Thanks.

The stock 18's on the boxster had 40 up front and 35's out back. I would stick with that tire side wall height. You could go 245 up front.

insite · 08-01-2007, 11:09 AM

Quote:

Originally Posted by Adam

265's are pretty skinny for a 10" wide wheel. 265's are meant for a 9" wide wheel. Might look kind of funny or provide funky wear/handling issues....I would go to at least 275's, but 285's is usually the width you want with a 10 in wheel. You might get some more understeer though as Insite mentioned, but are you tracking the car? If not that would be a non-issue.

a 265 is fine on a 10". looks ok, too (that's what i run).

easyc · 08-01-2007, 11:31 AM

On my 9.5" OEM carrera lightweights, my 265 Toyos were pretty stretched... My new 275's protect the rim much better... you have to be careful with 285's as some may not fit. I also run 245's in the front, but they do rub under full lock... but im on PSS9's. Go with the 235 or 245 in the front and 275 in the rear you will be happy...