XX1 Boost and non-boost Power m Spider must be combined with a XX1 Eagle DUB 8-hole crankset and a 104BCD X-Sync 2 chainring Magic Zero - Automatic calibration while driving. It is not necessary to press back the pedal or manually calibrate via the main unit Bolt Circle Diameter: 104mm Bolts: [chainring] 4, [power meter spider] 8 BB Type: SRAM DUB
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