these do mention using a fixie gear on the crank arm. i think this could be an option. i like to use a micro sized sprocket and that is supprising to me how hard it is to find a crank that is 160mm or shorter and will be compatable with a 20t or smaller sprocket. the fixie gears are cheap and easy to get a hold ove. these remind me of the st martin hollow flat cranks but in a 3 piece form factor. and yes the price is right even with shipping from the uk to the us