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Has the guide pulley in your bike's derailleur been dislodged, broken, or lost? Here's a guide on how to replace it.

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  1. How to Replace a Bicycle Guide Pulley, Bicycle Guide Pulley: step 1, image 1 of 1
    • Set your bike upside down by letting it stand on its handlebars and seat.

  2. How to Replace a Bicycle Guide Pulley: step 2, image 1 of 3 How to Replace a Bicycle Guide Pulley: step 2, image 2 of 3 How to Replace a Bicycle Guide Pulley: step 2, image 3 of 3
    • If the pulley is still in place, unscrew it from the arm with the allen wrench.

    • Using the towel with the alcohol or degreaser, clean the pulley and check for cracks or broken teeth.

    • If any extensive damage is present, discard the pulley.

    • Be sure to clean and check the pulley's condition if it has fallen out of the arm.

  3. How to Replace a Bicycle Guide Pulley: step 3, image 1 of 2 How to Replace a Bicycle Guide Pulley: step 3, image 2 of 2
    • The replacement pulley should come with a bearing. Remove the bearing.

    • Grease the pulley and bearing thoroughly.

  4. How to Replace a Bicycle Guide Pulley: step 4, image 1 of 2 How to Replace a Bicycle Guide Pulley: step 4, image 2 of 2
    • Push the bearing back into the pulley.

  5. How to Replace a Bicycle Guide Pulley: step 5, image 1 of 3 How to Replace a Bicycle Guide Pulley: step 5, image 2 of 3 How to Replace a Bicycle Guide Pulley: step 5, image 3 of 3
    • Place the teeth of the pulley against the chain, then push it with the chain into the derailleur arm.

  6. How to Replace a Bicycle Guide Pulley: step 6, image 1 of 2 How to Replace a Bicycle Guide Pulley: step 6, image 2 of 2
    • Grease the screw that holds the pulley in place.

    • Screw the pulley back into the derailleur with the allen wrench.

  7. How to Replace a Bicycle Guide Pulley: step 7, image 1 of 1
    • While temporarily lifting the chain off the pulley, check to see if the pulley rotates freely.

  8. How to Replace a Bicycle Guide Pulley: step 8, image 1 of 1
    • Push on the pedals to see if the derailleur is back in working order.

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To remove your pulley, see Step 2.

Kayla Bru

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CPSU-GREEN-F15S10G6

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