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What you most likely have is an old-fashioned coaster brake, along with a hand brake. In reality the coaster brake is probably more "natural" for someone learning -- the hand brake is mostly an affectation designed to make the bike appeal more to boys (of all ages). But it is possible to disassemble the rear hub and disable the brake in most cases. There ...


2

You should only need to replace the sprocket, nothing else. If you put on a smaller sprocket to get higher gearing/slower pedalling you need a smaller sprocket, not a larger one. You may need to remove a chain link. Those parts should be standard, the same as on an adult bike, and any bike shop should be able to make the switch. Coaster brakes are common in ...


1

There are many sites on the web for calculating spoke lengths. Some of them have pre-filled settings for hubs and wheels, http://leonard.io/edd/ others ask for exact dimensions. The old adage of measure twice and cut once applies here so I would say go for at least 3 sites and check that they tally up! Not forgetting Sheldon Brown's page, ...



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