Our site shows LIVE INVENTORY. If you can ADD TO CART, the item is IN STOCK.

Promax SQ-1 Aluminum Crank Arms - 1
Promax SQ-1 Aluminum Crank Arms - 2
Promax SQ-1 Aluminum Crank Arms - 3

Promax SQ-1 Aluminum Crank Arms

  • 140mm / Black
  • 140mm / Blue
  • 140mm / Red
  • 145mm / Red
  • 150mm / Red
  • 160mm / Black
  • 160mm / Blue
  • 160mm / Gold
  • 160mm / Red
  • 170mm / Black
  • 170mm / Gold
  • 170mm / Red
Secure Checkout

About This Product: Promax SQ-1 Aluminum Crank Arms

The Promax SQ-1 aluminum crank arms are cold-forged from 6061-T6 aluminum and fit on square spindle type bottom brackets.

SPINDLE FIT: For square spindle bottom brackets only
MATERIAL: Cold-Forged 6061-T6 aluminum
BOTTOM BRACKET: Sold separately (Square spindle type required)
CHAINRING: Standard 5-bolt chainring (110mm bolt pattern)
PEDAL FIT: 9/16" (standard for 3pc cranks)
INCLUDES: Right and Left crank arms

Need a bottom bracket?  CLICK HERE to see all of the square spindle bottom bracket options.

J&R Helpful Hint: Most bikes will require a 113mm length bottom bracket spindle when using these cranks.  You can typically use the standard (short) chromoly or alloy chainring bolts (Profile and some stock gears will require longer chainring bolts).  You will need a crank arm puller that is designed for use with a square bottom bracket.

135mm: 17.5oz/498g
155mm: 18.8oz/534g
165mm: 19.5oz/551g
170mm: 20.2oz/572g

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.