Surly Mr. Whirly Crank/Bottom Brackets Sets.
- Complete crankset, assembled; Comes with spindle, bearings and all parts required for installation
- All armsets utilize 58mm BCD to mount spiders. This BCD remains the granny ring size regardless of spider's larger ring BCD
- Triple cranks come with aluminum rings, MTB chainline; singlespeed cranks come with Surly stainless steel chainring
- Pugsley version inlcudes longer spindle for use with 100mm BB shells; for use with 65mm rims only (larger rims cause chain/tire rub - use Surly MWOD crankset instead)
- Forged and machined AL-7075; 9-speed compatible