Many thanks to forum members for sharing the knowledge. I have learned so much just reading through past posts. I am now running in my second build, 66cc china girl on 28" MB frame. It is identical to the first bike I built for my son to get to and from work on. He thinks its awesome fun and now that I have one of my own I have to agree. I am 50 and having a blast on this bike and its not even run in yet! Have got my next build on the bench already, managed to get hold of a chopper frame so cant wait to get to work on that! Will take some photos and post up soon. Anyway for now..... Hello to all!