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Box Vector Cranks - 1
Box Vector Cranks - 2

Box Vector Cranks

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About This Product: Box Vector Cranks

BOX Vector cranks are the world’s first BMX crankset with a Praxis 35-millimeter external bottom bracket and oversize aluminum spindle, making them about as stiff a BMX race crank as you can get anywhere.

Vector cranks also have hollow-forged arms and a fully CNC-machined 6061-T6 aluminum alloy BB30/PF30 bottom bracket fitted with precision sealed bearings for smooth free-spinning pedaling performance. A precision CNC-machined chromoly/alloy self-extracting crank bolt system makes installation and removal a snap.

They are available in matte black with laser-etched graphics in 175, 177.5 and 180 lengths. Vector cranks only fit frames with PF30 or BB30 bottom bracket shells.


WEIGHT 175-BX-CK1335175: 739 grams/26.7 ounces w/o BB
177.5-BX-CK1335177: 750 grams/26.75 ounces w/o BB
180-BX-CK1335180: 760 grams/26.8 ounces w/o BB
BB: 138 grams/4.5 ounces

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.