Originally Posted by
jdawginsc
Threading in the BB would narrow it down. Maybe something offbeat and Swiss?
The knurling on the lockring may indicate thread spec. While the crank arm is Campagnolo, the lockring is not, as Campagnolo did not knurl their lockrings. If it's a TA lockring, that knurling pattern would indicate English thread. But if it's a Nervar lockring, it would indicate French thread.
From Sutherland's 4th Edition.
