How To Replace Rear Derailleur Pulleys. Ad Outside Bundles VeloNews With 30 Other Leading Titles and Services. Oversized pulleys do not require a new chain - Since the added length in the chain is only about 2 teeth typically you can run oversized pulleys without having to replace your chain.
Linkage system on a rear derailleur called a parallelogram. I created this short derailleur pulley buyers guide to help so lets have a look at what fits best on which derailleur. For the best performance position the guide pulley roughly 6 to 7mm away from the cogs.
It is called the tension pulley or T pulley for short.
If you hear abnormal noise as a result of looseness in a pulley you should replace the pulley. Remove the derailleur cable by loosening the hex bolt on the cable retaining clamp. Now youll need to remove the chain from the derailleur. Oversized pulleys do not require a new chain - Since the added length in the chain is only about 2 teeth typically you can run oversized pulleys without having to replace your chain.
