depends on the race you are using the tires for, for the special events or something like that(the gold stadium, bottom left corner) use the R5, awesome grip and there is no tire wear in those races. For any other race use R3. I'm going to PM you the gear ratios right now.
wat r u goin to pm me on? u want my email adress? or u got msn?
baseballnut, can you send me some gear ratios?
i will send you some when i get the game back from my neighbor