Apparently they were designed for small cars with small tires and rims. I tried them on my 1993 Chevy K-3500, 265/75R-16 and the struts barely touched the wheel. When I used 2x4s underneath they fit better but then the tape measures hit the tires. Same problem on my 2000 Blazer, 235/75R-15. I wanted to send them back but I waited too long. Maybe I'll find something they work on sometime. It looks like they'll probably work fine with a shorter tire, but if you have a car with bigger tires then you need something different.