Introduction

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

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Image 1/3: Using the towel with the alcohol or degreaser, clean the pulley and check for cracks or broken teeth. Image 2/3: If any extensive damage is present, discard the pulley. Image 3/3: Be sure to clean and check the pulley's condition if it has fallen out of the arm.
  • 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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Image 1/2: Grease the pulley and bearing thoroughly. Image 2/2: Grease the pulley and bearing thoroughly.
  • The replacement pulley should come with a bearing. Remove the bearing.

  • Grease the pulley and bearing thoroughly.

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Image 1/2: Image 2/2:
  • Push the bearing back into the pulley.

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Image 1/3: Image 2/3: Image 3/3:
  • Place the teeth of the pulley against the chain, then push it with the chain into the derailleur arm.

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Image 1/2: Screw the pulley back into the derailleur with the allen wrench. Image 2/2: Screw the pulley back into the derailleur with the allen wrench.
  • 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

110 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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