I have an opportunity to buy a set of Zr-1 rims off of a corvette. However, this set has 17's on the front and 18's on the back. The sizes are 275-40-18 and 245-40-17 i believe. Anyways, I am worried that the back tires will not fit. I currently have the stock 16 inch rims on there now and the car has not been lowered. However, the rims are mounted with 2 brand new tires on the front and Drag radials on the back. However, I am also getting a brand new set of tires along with the rims, so for 500 bucks im getting the set of Zr1's and 6 brand new tires and 2 drag radials. This is such a good deal I'd hate to pass it up but I need to know if these tires will fit all around with no clearance issues, rubbing, speedometers, abs issues. Any and all input is appreciated, I gotta make a decision soon! Thanks

 

My bad, this inital post is actually for me but I forgot to sign out of my friend's account. Also, if anyone has pics of the mixed rims sizes on their f-bod I'd really like to take a look at them. Thanks

 

What are the exact sizes and offsets of the wheels? To my knowledge, GM never made an 18" ZR1 factory wheel, so these would appear to be aftermarket replicas. Whether they will fit correctly depends on the width and the offset.

The 275/40-18 tires are going to be 1" larger than your stock tires, and will cause the speedo to read 4% low, unless you correct in the PCM.