I am looking to put 20's on my 02 camaro. what width and size tire can I use on all 4's. Any that will work without mods?

 

No. Camaros have a built in anti-20" wheelstop that will make those not work.

 

Depending on the size of the rim, most with narrower 20s run 255s, but the wider ones require a 275 or 285. the problem is wider you go, the harder to find tires that are car tires, basicly once you get past 285, most of them are truck tires

 

check out my ss

235 35 r 20 in front
245 35 r 20 out back