I took my old huffy 18 speed savanah apart, it fits me like a glove but I decided to put a flip flop wheel on he back just make it a single speed. the crank is a basic axle and bearing set up. the chain rings have seen better days for sure . id like to put a three piece on here with a smaller front sprocket. would anyone here use the same set up it has stock or put the kit to make it a seled bottom bracket. what are my options with this single speed conversion