Crank Arm Material – 6061 Aluminum

Spindle Material – Aluminum

Spindle Diameter – 30mm

Weight – 775 grams (175mm). 820 grams w/ included spider

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

Chainline – 43.2

Q-Factor – 170

Additional Info

Promax EX-2 30mm bottom bracket with wave washer sold separately

Use of a wave washer recommended for proper bottom bracket spacing and bearing preload

104mm BCD spider included, 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

HF-3 Cranks are not compatible with CK-1 spiders

Pedal washers included (required)

Spindle Bolt Installation Torque: 35-40Nm

Spider/Chainring Installation Torque: 6-9Nm

Part Numbers

170mm • CK21-030HF170-BK

172.5mm • CK21-030HF172-BK

175mm • CK21-030HF175-BK



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