All bikes should have -1+2 IMO. Its a sportbike its supposed to be loud and fast. U will have to change gears more,but thats how u go fast. Get 1 new chain and put the biggest sprocket u plan on usin on and cut the chain so that the axle spacers are all the way to front or close. Then u can always go down on teeth from there. On my race bike i can put 3 diff rear sprockets on the same chain,but it does affect handleing with the diff WB.