Surly Mr. Whirly Crank Arm Sets are sold without spider or spindle for complete customization.
- Armsets include non-drive side bearing adjust cap, drive side PTO bolt & cap, and two sets of spider mounting bolts (one short for spider mounting only, and one long for mounting spider with granny ring)
- Chainrings, and chainring mounting bolts sold separately
- Outboard-style bearings sold separately; use Shimano Mtn, Race Face X Type or FSA MegaEXO
- Build it to be the crank you want: single, double, triple, or trials
- Forged and machined 7075 aluminum
- Weight: 605g