Crank Arm Material – Premium Carbon Fiber

Spindle Material – Aluminum

Spindle Diameter – 30mm

Weight – 448 grams (175mm). 520 grams w/ spider (sold separately)

Bolt Circle Diameter (BCD) – 104mm, or Direct Mount

Chainline – 43.5

Q-Factor – 164

Additional Info

Promax EX-2 30mm bottom bracket sold separately

104mm BCD 4-Bolt spider sold separately, 6061-T6 Aluminum

Compatible Promax Direct Mount Chainrings are sold separately, which allow you to eliminate your spider for ~68 grams of total weight savings

Pedal washers included (required)

Spindle Bolt Installation Torque: 35-40Nm

Spider/Chainring Installation Torque: 6-9Nm

Part Numbers

170mm • CK21-030CK170-BK

175mm • CK21-030CK175-BK



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