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Promax CK-1 Carbon BMX Race Crank Set - 1
Promax CK-1 Carbon BMX Race Crank Set - 2
Promax CK-1 Carbon BMX Race Crank Set - 3

Promax CK-1 Carbon BMX Race Crank Set

  • 175mm
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About This Product: Promax CK-1 Carbon BMX Race Crank Set

The Promax CK-1 Carbon BMX Race Crank Set blends lightweight carbon arms with a tough 30mm chromoly spindle for extra strength and efficient power transfer. Tailored for SRAM 3-Bolt mount style chainrings (sold separately), it also offers compatibility with the Promax 4-Bolt 104BCD Spider/Adapter. The required pedal washers come included.


  • Premium carbon crank arms are lightweight and extremely strong
  • 30mm chromoly spindle provides increased stiffness and efficient power transfer
  • Designed and optimized for chainrings with SRAM's 3-Bolt mount style (bolts sold separately. SKU number CK2203 recommended)
  • Compatible with Promax 4-Bolt 104BCD Spider/Adapter for CK-1 cranks (sold separately)
  • Pedal washers included and required
  • Bottom bracket sold separately


  • NUMBER OF CHAINRINGS: No Rings, No Spider Included
  • COLOR: Black
  • PEDAL SPINDLE: 9/16"
  • CRANK LENGTH (mm): Available in 170mm and 175mm
  • RINGS: Not Included
  • DRIVETRAIN SPEEDS: Single Speed 3/32"
  • CHAINRING BCD: Direct Mount SRAM, 104

Crank Size Chart

Crank Size Chart
Inseam length Crank Length
Crank Size: Micro, Mini. Junior
Inseam length: 15 - 16 inch Crank length: 130 mm
Inseam length: 16 - 17.5 inch Crank length: 135 mm
Inseam length: 17.5 - 19 inch Crank length: 140 mm
Inseam length: 19 - 20 inch Crank length: 145 mm
Inseam length: 20 - 22 inch Crank length: 150 mm
Crank Size: Junior, Expert, Expert XL
Inseam length: 20 - 22 inch Crank length: 150 mm
Inseam length: 22 - 23 inch Crank length: 155 mm
Inseam length: 23 - 25 inch Crank length: 160 mm
Inseam length: 25 - 26 inch Crank length: 165 mm
Crank Size: Pro and Larger
Inseam length: 26 - 27 inch Crank length: 170 mm
Inseam length: 27 - 28 inch Crank length: 175 mm
Inseam length: 28 - 30 inch Crank length: 177.5 mm
Inseam length: 30 - 31 inch Crank length: 180 mm
Inseam length: 31 - 32 inch Crank length: 185 mm
Inseam length: 33+ inch Crank length: 190 mm

How To Measure Your Inseam

  1. Start with a pair of pants you already have that fit you well and lay them flat on the floor.
  2. Carefully measure the length from the crotch seam to the bottom of the leg.
  3. THIS NUMBER IS YOUR INSEAM. Use this number to help you choose your cranks.