help with tire size

96lastc4 · 08-07-2006, 09:59 AM

Hi

I would like to put 18" factory 2004 wheels on the rear of my 96. What tire size should I use to keep the speedo close? Also is there anything I need to modify?

My current size is the standard 285 40 r17. With the Saw blade wheels.

Thx

aggie88 · 08-07-2006, 01:07 PM

285 35 18 is right on. I used 275 35 18 on my 95, a bit shorter but not much effect on the speedo.

MYCoupe · 08-07-2006, 03:11 PM

Your current tire is 25.98" in diameter. On the stock C5 rear wheels you are limited to a 275 or 285 section width tire, unless they are Z06, in which case you can go up to a 295 tire.

275/35/18 = 25.58" diameter
285/35/18 = 25.85" diameter

As aggie88 stated the 285 is almost a perfect match. Your speedometer will be off probably by like 0.5 mile at most.

96lastc4 · 08-10-2006, 09:41 AM

Hi

thx for the sizes. The local tire Guy thought that 275 40 r18 was also an option what do u think.

MYCoupe · 08-10-2006, 11:47 AM

Quote:

Originally Posted by 96lastc4

Hi

thx for the sizes. The local tire Guy thought that 275 40 r18 was also an option what do u think.

For a C5 not a C4. That tire has a 26.66" diameter. While it will work, your speedometer error will be greater with that tire. Personally I would stick with a 285/35/18 tire.