Tire Size

Hey everybody...

I'm looking for new 15'' rims for my 70 Chally. Tire size should be 275 or more and I just wanna make sure they'll fit in the wheel case. Probably some 8'' wide rims would do, but I have no idea about the offset.
I really like the "Centerline Auto Drag" rims...do you guys have any suggestions or experiences?
I appreciate your help :confused:

Nico