i'm running the stock rims right now but i'll be running 19s all the way around on a 35. the stock ones are 40s up front and 35s in the back so it evens out. so going 19s all around i'll run a 35, but if you run a 19 front 20 rear you'll have to run a 35 front and a 30 series in the back for your tires. so far no ones having problems with the rims and tires with 20s. i'm putting kw coilovers on so i don't want to go to big for my rims.