Thanks, i wont be spending that kind of money though, i got lucky with an upgraded llama for £250 when visiting london before that i was touring with a chinese 7 speed mountain bike from a scrap heap until it fell apart... The brompton seems much more durable than the bf frame was which is why im gonna use it but this will be as cheap as possible upgrades... Right now im in australia so limited availability on parts... Why cant a different type of bb go in brompton to allow more choice of cranks?