Pendix or bafang bbsd are the two main ones, both fit fine. Maybe the original mk1 frame might not fit as the bb lower tube was very chunky! Grounding out isn't a common thing, centre stand hangs lower and will likely catch first.
Cheers for this and the advice from others. I think I may have a mark one frame. I bought it about 7-8 years ago and it was 2nd hand at the time.
@etcdaman started
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Pendix or bafang bbsd are the two main ones, both fit fine. Maybe the original mk1 frame might not fit as the bb lower tube was very chunky! Grounding out isn't a common thing, centre stand hangs lower and will likely catch first.