My 10 year old son is a bit of a daredevil so I just picked up a SE Bronco Freestyle for him. It is a strong (cheap) entry-level bike but we are finding that he prefers riding slower, doing tricks riding rather than faster like in racing.

The question is where can I get parts to change out the chain-ring from the one piece crank to a smaller one that is more suited to his style of riding? Will I have to change the whole crankset?



Have worked on our mountain bikes for a few years (all have three-piece cranks) but never played with one-piece cranks. And no, I don't want to spend too much money on a beginner bike.
Thanks in advance!