Hi guys, first post here! Got a chinese bike (i know ), had a lot of fun over the past few years with it. Problem is, the chain just broke today. Was thinking of getting a different sprocket set to go with a new chain. Currently i have 15t front and 54 (i think) rear. I feel like 1st and 2nd gear are way too low for my needs, and that most of the time im in 5th revving the nuts off. What sprockets would you recommend? I also am having a hard time finding sprockets that will actually fit! Inner diameter is 64mm, bolt center is 80mm i think. Ive attached a pic. Anyone know where to get a set, and what tooth ratio to recommend? Cheapest is best btw, dont use the bike that much!