Introduction

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

  1. Set your bike upside down by letting it stand on its handlebars and seat.
    • Set your bike upside down by letting it stand on its handlebars and seat.

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  2. If the pulley is still in place, unscrew it from the arm with the allen wrench.
    • 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.

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    • The replacement pulley should come with a bearing. Remove the bearing.

    • Grease the pulley and bearing thoroughly.

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    • Push the bearing back into the pulley.

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    • Place the teeth of the pulley against the chain, then push it with the chain into the derailleur arm.

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    • Grease the screw that holds the pulley in place.

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

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    • While temporarily lifting the chain off the pulley, check to see if the pulley rotates freely.

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    • Push on the pedals to see if the derailleur is back in working order.

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Conclusion

To remove your pulley, see Step 2.

Kayla Bru

Member since: 09/29/2015

128 Reputation

1 Guide authored

Team

Cal Poly, Team 10-6, Green Fall 2015 Member of Cal Poly, Team 10-6, Green Fall 2015

CPSU-GREEN-F15S10G6

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