Ok...thanks to marioG, I now know what size/weight my stock rollers are for my Like 200i (18x14, 13.5g, and there are 6 of them). My next question is what weight should I change to? I am looking to get a few more mph at the top end. I am pretty happy with my take off and acceleration as it is. I know you are supposed to go up in weight to gain top end, but how much should I go up...and should I increase the weight of all the rollers, or do some sort of combination of weights? Also, what is the max speed increase I should expect by just changing the rollers? My current top speed is around 60 bone stock. I have researched this on the web, but have seen too many different takes on the subject. I am just looking for some good sound advice to get me headed in the right direction.