Proprietary dimensions and spline for use only with Surly Mr. Whirly cranks
3 types:
- Short; to fit 68 and 73mm BB shells :BBSUWA68
- Long; to fit 100mm BB shells e.g. Pugsley with 17.5mm offset: BBSUWA10
- XL; to fit 100mm BB shells but for Moonlander with 28mm Offset, spindle length 171mm: BBSUWA71
Specifications:
- Material: 100% CroMoly steel





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