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> Bicycling Catalog > Parts > BMX > Promax > CF-2 Two Piece Crank Sets
Promax CF-2 Two Piece Crank Sets
  • Color: Red
  • Color: Gold
  • Color: Blue
  • Color: Black

Promax CF-2 Two Piece Crank Sets


Product Details

Promax CF-2 Two Piece Crank Sets

Cold forged from 6061-T6 aluminum to be strong yet lightweight, CF-2 cranks feature a two-piece design that incorporates a beefy 24-millimeter spindle permanently fitted into the drive-side arm.

With a 104-millimeter BCD four-bolt spider, they come in anodized red, blue, gold and black with laser-etched graphics in 160-, 165- and 170-millimeter lengths. Includes a sealed bottom bracket. Meets or exceeds ENBMX standards.

Chainline: 43
Q-Factor: 167

160-PX-CK132P160: 705 grams/24.9 ounces
165-PX-CK132P165: 720 grams/25.4 ounces
170-PX-CK132P170: 728 grams/25.7 ounces

Bottom Bracket only: 115 grams/4.05 ounces

Tech Tip:
When using Promax HF-2 or CF-2 cranks, DO NOT use any spacers between the BB shell and and the BB cups. This will effectively shorten the spindle length.

Our cranks are BMX-specific and have a single-speed BB spindle designed to work with standard 68mm BSA BB shells. The spindle width is standard and should fit any and all 68mm BSA BB shells with external BBs without any additional BB spacers between the bearing cups and BB shell while maintaining a 43mm chainline and 167mm Q-Factor.

The spacers are meant to be used only when using an MTB-style crankset meant for a 73mm wide BB shell with a our BB and a 68mm BB shell BMX frame. Make sense? For example, if you were using an XTR crankset with a standard BMX frame and our BB.

Our cranks are designed to fit 68mm BB frames. The spindle length was determined for this, too.

Using the spacers with our cranks on a standard 68mm BB shell can do several things.

1. Create incorrect chainline/alignment.

2. Prevent the left arm from clamping correctly to the spindle as the spacers effectively “shorten” the spindle length.

We do not recommend the use of spacers with our cranks when used on BMX or other frames with a standard 68mm wide BB shell. However, I have seen many riders do this, with no apparent problems. I also have seen problems.

Some BBs made by other companies are wider than standard and cause similar fit issues.

  • Part Numbers close open

    Option Manufacturer's Part Number Store SKU
    Red / 160mm PX-CK132P160-RD PACR0768004
    Gold / 160mm PX-CK132P160-GD PACR0768003
    Gold / 165mm PX-CK132P165-GD PACR0769003
    Blue / 160mm PX-CK132P160-BL PACR0768002
    Blue / 165mm PX-CK132P165-BL PACR0769002
    Black / 160mm PX-CK132P160-BK PACR0768001
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