United States

Parts & Accessories

Mr. Whirly Crank Arms

Mr. Whirly Crank Arms
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Mr. Whirly Crank Arms

Surly Mr. Whirly Crank Arm Sets are sold without spider or spindle for complete customization.

  • Chainrings and chainring mounting bolts sold separately
  • Build it to be the crank you want: single, double, triple, or trials
  • Arm sets 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)
  • Outboard-style bearings must be purchased separately; use Shimano Mountain, Race Face X Type, or FSA MegaEXO
  • Forged and machined 7075 aluminum
  • Available Crank Lengths: 165, 170, 175, 180, 185mm

Mr. Whirly Instructions