Surly Mr. Whirly Pugsley Specific CrankBottom Brackets Sets have a longer spindle for use with 100mm BB shells. Triple cranks come with aluminum rings, MTB chainline Complete crankset, assembled. Comes with spindle and bearings Forged and machined AL7075 9speed compatible All armsets utilize 58mm BCD to mount spiders. This BCD remains the granny ring size regardless of spider's larger ring BCD Pugsley version has longer spindle for use with 100mm BB
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