ok simple question i have looked at alot of replies with mixed messages what i need to know from someone that has this set-up is can you run a 275 60 r15 on a corvette ralley with 4" backspacing on the rear of a chevelle some are saying that you must have at least 4.5 b.s. and if you are is there any modification to the lip thanks guys Ed

4.5 is the way to go unless you want to raise the car up to clear the tires. That 1/2 inch makes a big difference. I run 275x 60x15 drag radials on the 4.5s and they fit perfect.

So, 4.5 inches of backspace are a must for 275 60? The only other they would fit is to use something like air shocks?

I think you will be awfully close with only 4"bs and might rub right away or at least whe cornering or with a full car load , or some other special circumstance. I would recommend a P255 tire with 4" bs or if you insist on going with a P275 you will probably need to roll the lip or raise the car... and air shocks is one way to accomplish this. Personally, I would not raise the car to get clearance, I would run P255 tires. 27.1" Diameter & 10.2" section width versus 28" Diameter & 11" section width. That .4" difference (.8/.2) to the lip should be enough to offset the .5". I run P275's on my 70 with 4.5"bs and they fit perfectly like said above but I don't think I have 1/2" of clearance.

Just my $.02

Good Luck,

Robert

thanks guys that is what i needed to hear well anyone looking for a nice set of rallys looks like these are going for sale thanks again Ed