Well I'm kinda torn, I'll give you some nubers.........I'm 220 suited, last year the bike was stock, the best I ran was 10.27 1.62 60f. Now have Brock Meg, PC, and 62" wb. I do not want to put an air shifer on, maybe I'm thinking into this too much, worse case, I buy another rear sprocket. Thanks for all of your help.