>>1539051Kind of a pain in the ass to deal with and you need special tools to take the gears off and stuff. Probably better to take it to a shop to adjust. Hopefully they wouldn't charge you more than $10 or something. Find a shop that looks more "normal people"-y and not "racer"-y.
>>1539106Having a shit bike makes 20mph harder, it doesn't make 200w harder. You won't be "training" any more effectively, you'll just be slower.