Originally Posted by yonderboy
Are they done up like a 1pc crankset with the inner cone tightened against the chainwheel?
Yeah, The chainwhell fits on the crank arm with a splined interface and then a lockring tightens against the chainwheel holding it onto the crank arm splines. I think the cranks would work really well for Single Speed but not for fixed riding - the back pressure from riding fixed helps to gradually loosen the lockring and let play develope between the cranks and chainwheel.