Re: err... (houstonspeedfreek)
There are some expensive purpose-built fender rollers available. From what I have read, someone experienced in doing so can do the job without cracking the paint. But...how many experts are there that you can trust?
I'm going to roll the fenders on my beater this spring with a baseball bat like stated above. The car got hit this winter and I got enough insurance money to get the damage fixed and have the car repainted, so I'm rolling them before its painted. My Nissan evidently can't handle the big meaty 205/40R16's without chewing up the sidewall on my left rear.