i have a 00 cbr929rr and it's time for a new chain and sprocket and would like to upgrade from my stock parts. I have limited experience in this area and would like some imput. I'm looking at a RK racing chain and sprocket kit which includes a 15/43 sprocket set up and a 2.87 ratio (not sure what that means) and a GB520GXW-108 chain. Any input will be helpful...this a good set up for street riding. Thought it would be better to get a package deal instead of ordering a vortex sprocket and rk chain seperate...thanks.