O.K. I never go to the track. Only use my 02 998 for the streets/canyons. Came stock with 120/70 in front and 190/50 in rear. However, I have several people saying I need to change to 190/55(better performance), and others saying my (stock)rim is the wrong size for that change and would do more harm than good. If this is a repost can you direct me to the original post since I couldn't find it? Otherwise, educate me please because I don't want to buy tires that are wrong for what I have and how I ride. Thanks guys.