Largest Tire Tech:

[hockeyman]

As I was cleaning out my folders, I found This Tire Chart. Gives you an idea of what options you have with selecting large tires for any Camaro or Firebird.

[FunkZ]

Nice info!

They have the 18" tire profiles incorrect for 4th gens though. Should be 275/35 and 295/30.

[Nikos95]

Ya I find those numbers a little odd.

The following are for '93-'97

Factory size on a z-28 is 235/55/16
That makes a sidewall height of 235 * .55 = 129.25

Factory size on V6 is 215/60/16
That makes a sidewall height of 215 * .60 = 129.00

If you used a 245/50/16
Thats gives you a sidewall of 245 * .5 = 122.50

With a 255/50/16
That gives you a sidewall of 255 * .5 = 127.50
Which is much closer to factory height.

If you look at that and math doesn't lie, a 245/50/16 will offset your spedometer a little bit, infact on a A4 auto 95 3.4 when you read 70 you be going 67. I did that math also.

They might be saying use a 245/50/16 because a 255 is a little wide for a 8" rim so I have been told by old tire guys.

[FunkZ]

GM used 235/55 standard on the V8's and 245/50 was the optional size for the Z speed rated tires. 255/50 was used on the early C4's 16x8.5 wheels but AFAIK never on an Fbody.

[Nikos95]

Okay well thats probably why, the 245 would give you a noticable stance difference, and the 255 probably is a little wide for the 8" rim and thats why they recomend 245. That much makes sense. Ohh well I was planning on 245/50's anyways they are easier to get!