How to Check a Chain Stabilizer Assembly

Chain stabilizers, also known as chain guides or bash guards, are found on downhill and freeride mountain bicycles. Designed to keep the chain firmly in line with the drive train and geared teeth, a chain stabilizer is necessary for the grueling downhill riding conditions found in down-hilling and freeriding. Include a check of the chain stabilizer prior to each ride to ensure the chain staying on. With the high speeds and jumps of this stye of riding, a chain coming off the gears has potential to cause major damage to bike and body.

Things You'll Need

  • Hex wrenches
  • Cone wrench
  • Chain lubricant
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Instructions

    • 1

      Lift the rear end of the bicycle up and hand turn the cranks and pedals. Watch the chain and how it moves through the stabilizer and shift through the full range of gears on the bicycle. With each shift, check the chain stays squarely between the stabilizer's ends and the chain stays under and meshed through the stabilizers teeth.

    • 2

      Tighten the three retaining screws holding the chain stabilizer to the frame. Depending on the stabilizer, use a 4mm or 5mm hex wrench; different makers use different screws so have a selection of the hex wrenches available.

    • 3

      Check the bottom bracket shell on the bicycle if your chain stabilizer attaches at the bracket. Some models of stabilizer attach at this point which is in the direct center of the bicycle's bottom, right-side. Ensure the stabilizer is tight against the bracket. If loose, tighten with a cone wrench.

    • 4

      Turn the bicycle upside down and set it on the seat and handlebars. Turn the chain and squirt lubricant over the chain, making sure some of the lubricant penetrates the chain stabilizer.

    • 5

      Flip the bike back right-side up. Hop on and go for a short pedal on flat ground, shifting through the gears to make sure the stabilizer works under pressure-weight. Once done, go ride, the stabilizer is ready.