I know what you mean, because when I tried my brothers stang rims 17" GT rims with 275/40's, I had to rest the cars frame on stands pretty high off the ground. I'm pretty sure that I tilted the bottom inside and kinda let them fall on the ground face first. Hard to explain but it worked and not a big deal. Havent tried with a 15" rim but the same combo will more than likely go in my car too so I'd like to know too.