305/35r18

**Soltakr** · 08-01-2008, 03:47 PM

Would this fit under the rear of my 02 SS without rubbing?

Current wheels are 18x10.5 and I'm running 295/35R18. Would like to go with 305 but its pretty tight fit now. Anyone try this?

**Eugenio_SS** · 08-01-2008, 11:22 PM

you should get 30 profile..
I have NT01 315/30-18 on the C6 18x10.5
pix in signature.

**Y2K_CAMARO** · 08-02-2008, 01:54 AM

I'm not really sure what the whole difference between profiles are. What does that number measure?

**Eugenio_SS** · 08-03-2008, 10:17 PM

profile means the % relative to the width is the sidewall.
For example: 315/35-17 means it's a 17" tire, 315mm width.
35 means that the sidewall is 35% of 315 = 0.35x315 = 110.25mm = 4.34"
Since there are 2 sidewalls (below + above the wheel), the overall diameter = wheel size + 2x sidewall.
Which in this case would be 17" + 2x 4.34" = 17 + 8.68 = 25.68" overall diameter.

This is what the #s mean.
Now, what's important about getting different tire sizes, is to keep the Overall Diameter (OD) pretty close to stock, so that it doesn't affect the speedometer, and you will have less clearance issues as well.

**Y2K_CAMARO** · 08-04-2008, 06:05 AM

A little confusing, but I think I got it

**Soltakr** · 08-04-2008, 07:25 AM

I understand the measurements fine. But some time if the numbers add up right you still have a little fitment issue. When I did the math it is right to the limits but I know the car isn’t perfectly built. The rear axle sits slightly off to one side on my car. So the passenger side has a little more clearance to fender but tighter on the body side, and visa versa. I wouldn’t normally try to run this size but I got a chance at some Nitto's with 5 miles on them for $100.00 so I worth it to try and find out.

**Eugenio_SS** · 08-04-2008, 10:40 PM

Originally Posted by Y2K_CAMARO

A little confusing, but I think I got it

here is a file w/ the overall diameters for all (a lot) sizes
http://www.ls1.com/forums/showthread.php?t=80679

**Eugenio_SS** · 08-04-2008, 10:41 PM

Originally Posted by Soltakr

I understand the measurements fine. But some time if the numbers add up right you still have a little fitment issue. When I did the math it is right to the limits but I know the car isn’t perfectly built. The rear axle sits slightly off to one side on my car. So the passenger side has a little more clearance to fender but tighter on the body side, and visa versa. I wouldn’t normally try to run this size but I got a chance at some Nitto's with 5 miles on them for $100.00 so I worth it to try and find out.

adj. PHR will fix that.