Shimano Sora R3000 9-speed Rear Derailleur

The Shimano Sora R3000 rear derailleur is suitable for 9 rear gears. This 9 speed rear derailleur is compatible with all Shimano 9 speed race group sets, such as the Shimano Sora R3000, Shimano Tiagra 4500, Shimano 105 5500, Shimano Ultegra 6500, Dura Ace 7700. The Short Cage can handle a maximum cassette of 32T and the Long Cage can handle a maximum cassette of 34T descending.

Skew derailleur hanger?
A problem that crops up often is a skew derailleur hanger. It can happen if the derailleur knocked into something, for example in the case of a fall on the bike. Luckily it can be fixed! You can read more here.

Clean the jockey wheels well too!
Just like the chain, the jockey wheels on a derailleur get super dirty. As a result the shifting is not as good and it does the lifespan of your derailleur no good. For that reason, it's a good idea to clean the jockey wheels at the same time when you clean and lube your chain. Do this by running a cloth along the jockey wheel while gently turning the chain. Of course it gets to a point where the jockey wheels are worn out. In this blog post you can find out more about when jockey wheels should be replaced and what you'll need.