GRX RD-RX820 12-Speed Rear Derailleur

The SHIMANO GRX RD - RX820 rear derailleur is a great choice for cyclists. It's compatible with 11 - 34T and 11 - 36T 12 - speed cassettes, offering a broad gear range. This means you can maintain a comfy pedaling rhythm on any terrain. It comes with an integrated chain stabilizer that ensures quieter gear shifts and better chain control on bumpy rides. Also, there's an ON/OFF switch on the chain tensioner for smooth - surface outings.

Using this rear derailleur is easy. Just make sure it's properly installed on your bike according to the instructions. When riding on rough terrains, keep the chain stabilizer on to have a quieter and more stable ride. For smooth surfaces, you can turn off the chain tensioner switch. As for maintenance, regularly clean the derailleur to remove dirt and grime. Check the chain and gears for wear and tear, and lubricate the moving parts from time to time. If you notice any unusual noises or problems, it's best to have it checked by a professional.