I thought the only thing that mattered when replacing a bottom bracket was the thread size (68mm) and the spindle length. - unsavory
Me too. I had thought that the things to consider are:
- Thread specification e.g BC 1.37 x 24, English or Italian
- Thread width: 68 or 73mm
- Cranks interface
- Spindle length e.g. 113mm
And now it turns out the axis offset matters. How do I determine this before purchase. E.g. in this datasheet there is no mention if the axis is symmetrical or offset.
When should I be worried about unsymmetrical BB spindles and where should I check to ensure compatibility?