How to Measure Side Pull Brakes on a Bike

The function of a side-pull system is implied by its name. A brake cable is attached to one side of the rear arm of a bike, which is joined to the front arm with a central mounting bolt. When the brake lever is depressed, the upward pull of the cable causes both arms to pivot and close tightly around the rim. If you're in the market for a new side-pull braking system, you'll need to measure your old system to ensure it is compatible with your bicycle.

Things You'll Need

  • Millimeter ruler
  • Adjustable spanner wrench
  • Allen key set (optional)
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Instructions

    • 1

      Flip up the quick-release tab, located to one side of the brake arms. Remove the brake cable from the slot in the rear brake arm.

    • 2

      Loosen and remove the mounting bolt with an adjustable spanner wrench. Some newer side-pull brake systems use an Allen-style mounting nut, so use an appropriately sized Allen key if this is the case.

    • 3

      Pull the brake system away from the bicycle frame and set it aside.

    • 4

      Place one end of the millimeter ruler at the inside center of the brake arms. Note the measurement from the center of the arms to the bottom of the brake pad adjustment slots; this is the maximum reach of your side-pull system.

    • 5

      Place the millimeter ruler straight across the brake arms and note the measurement from the inside of one arm to the other. This is the maximum width of your side-pull system.

    • 6

      Record these measurements and use them for reference purposes when selecting a new side-pull brake system for your bicycle.