what size rimes and tires can you run on a first gen pro. I have 15 on it now but would like a little larger 16 17 something like that

 

im running 17x7's on my 323 with a 3-3 1/2" drop.

 

16" or 17" wheels with a proper offset should fit without any problems.

 

ive got 17's with a 40 series tire. i havent lowered yet but sometimes i wonder if the tire is going to tuck under the fender the right way during bumpy conditions. also be careful with a 40 series tire. its like less than two inches of sidewall. i didnt listen to people when i bought mine, now i have dents on two of them. damn potholes.