Introduction

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

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.

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.
  • 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.

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

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

Grease the screw that holds the pulley in place. 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.

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

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

Conclusion

To remove your pulley, see Step 2.

Kayla Bru

Member since: 09/29/2015

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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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