How to Fix a Gyro on a Haro Bike

Written by jonathan d. septer
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How to Fix a Gyro on a Haro Bike
The gyro mechanism rests between the frame and the stem on the front of a bicycle. (bicycle wheel image by Wendi Evans from Fotolia.com)

Gyros--or brake detanglers--come installed on a variety of bicycles, such as Haro bikes, yet most every design is essentially the same. According to the Park Tool website, a gyro "is a linkage system used [in] BMX Freestyle bikes that allow(s) the front wheel and bars to rotate 360-degrees without the brake cables tangling or wrapping around the stem."

Frequently, the gyro brake cables stretch and come out of adjustment, and the gyro develops flop (side-to-side movement) when the handlebars are spun. The only adjustments, and thus the only way to fix a gyro, are via the four barrel adjusters at the points of brake cable attachment on the two interlocking plates, the single brake lever barrel adjuster and the brake cable fixing bolt on the brake caliper.

Skill level:
Moderately Easy

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Things you need

  • 5mm hex head wrench or 10mm box end wrench

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Instructions

    Fixing or Adjusting a Gyro

  1. 1

    Turn the brake lever barrel adjuster--a small turning cylinder where the cable enters the brake lever--counterclockwise a few turns to remove some slack from the upper gyro cable. When the lever is pulled, the cable should not move, but should stay seated in the barrel adjuster.

  2. 2

    Turn both upper gyro cable barrel adjusters until the threads of the adjusters stick 1mm out of the bottom of the plate threads.

  3. 3

    Turn both lower gyro cable barrel adjusters until the threads of the adjusters stick 1mm out of the bottom of the plate threads.

  4. 4

    Loosen the cable attachment bolt at the brake caliper, turning counterclockwise with the hex wrench or box end wrench.

  5. 5

    Pull any slack out of the cable, and tighten the cable attachment bolt, turning clockwise with the appropriate wrench.

Tips and warnings

  • The key to fixing or adjusting a gyro is proper cable tension. The steps define how to achieve proper cable tension with most gyros. If the gyro needing fixing is an uncommon design, merely achieve cable tension to fix the gyro.
  • Gyro flop may indicate a more serious problem going beyond the gyro itself. If the steps are followed and gyro adjustment is not optimal, seek out professional help at the local bicycle shop.
  • Improper bicycle gyro cable adjustment may render the rear brake caliper inoperable.

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