Hi, I have this SSR Professor sp1 19x8.5 with +55 offset.

I want to change it to a 20" rims, but how do I know the best width and the best offset for my car, can I get a 4-6 inches in my wheel's dish?

Couldn't tell you the best width and th best offset for the car dude, but aslong as u get clearance turning then u should be ok..... may i ask why u wan to slam it with 20's? why not use a lowering kit or coilovers ?

I'd keep that SSR personally, I'm on 19's too. Lowered about 2" 20's are a bit excessive and quite a bit more uncomfortable. When you have a 30lbs wheel on 25-30lbs tires on a suspension made to wear around 40lbs at the corner your car will tell you.

You can't get any wider without issues unless you ruin the camber. So look for the same offset.

did the 19"s make your car slower?

o yea they lost probably as much as 7 hp with those 19s on there..


lightshow

but..... they didnt loose any top speed though. the rate of acceleration was reduced