Originally Posted by
rideone
thanks. what could this imply for interchangeability? sutherlands handbook says that french won't work because the thread pitch is too different, even though the diamater looks pretty close. anyone ever try this?
It implies that a slightly smaller diamter French freehwel may be used a British threaded hub. If the French freewheel is slightly oversized and the hub slightly undersized it could thread on all the way. Sometimes it takes a little working and back and forth with well lubed threads. On the other hand if you have slightly oversized British freewheel with a slightly undersized French hub the freewheel may not even thread tightly which results in stripped threads.
And yes, I've tried it. Its not recommended.
Pic of 'groove':
