Einleitung
Has the guide pulley in your bike's derailleur been dislodged, broken, or lost? Here's a guide on how to replace it.
Was du brauchst
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Set your bike upside down by letting it stand on its handlebars and seat.
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If the pulley is still in place, unscrew it from the arm with the allen wrench.
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Using the towel with the alcohol or degreaser, clean the pulley and check for cracks or broken teeth.
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If any extensive damage is present, discard the pulley.
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The replacement pulley should come with a bearing. Remove the bearing.
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Grease the pulley and bearing thoroughly.
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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.
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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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To remove your pulley, see Step 2.
To remove your pulley, see Step 2.