Hey bro. I will be ordering my carrozzeria wheels in two weeks. But I don't quite understand this sprocket thing. I go to order my sprocket and it asks for all kinds of numbers...520 530 so forth and so on. All I want is for the thing to work without a speedo healer. I want the exact same size sprocket and chain as my stock sprocket and chain. I don't know what numbers to enfer when its time to purchase. A little help please bro. I'm ordering black carrozzeria wheels with a vortex sprocket and compatible chain from 58 cycle, they have the cheapest wheels.