Got a bike with a PF Shimano BB, a pair of the Hope GXP BB convertors and a spare SRAM crankset.
Is there anything 'special' about Hope bearings that allows this (or Shimano ones that prevent it)?
I'd imagine the bearing width would be key consideration. Since you have to press them in then give it a go. If they don't fit or the is friction then it's a no, otherwise I'd try them with cranks.
Hope bearings have an ID of 24mm & make direct contact with the crank axle.
Shimano bearings have an ID of 25mm & use a plastic tophat spacer between the bearings & the crank axle. The tophat might mess things up. I guess the only way to find out is to try it.
I'll give it a go, if my frame explodes I'll report back.
I'd say no, as the placky tophat nobbles things.
they don't.
The top hat thing wasn't much of an issue but there's so much plastic around the back of the bearing that there's no access to fit the spacer on the there.
the sram clamping mechanism works by clamping a single bb cup and applying any sideways force (in either direction) to that cup. I would suggest a bb cup that hasn't been designed for that force will fail fairly quickly. Surely if you're relying on clamping the top hat (plus an adapter) there's nothing to stop it simply moving outwards away from the frame?