Shimano Alivio RD-M3100 Shadow 9 Speed Rear Derailleur gsforcee1 The upper layer is a

The upper layer is a lower density foam suitable for cushioning but with excellent resilience

Compatible with 16" to 29"+ wheels (ISO/ETRTO rim sizes from 317 to 630+)

or anything in between is a must

The only way to get the best out of your chain and its running efficiency is to make sure it’s regularly and properly cleaned and lubed

2 threaded cups with CeramicSpeed bearings installed

Shimano Alivio RD-M3100 Shadow 9 Speed Rear Derailleur gsforcee1 The upper layer is aThe SHIMANO ALIVIO M3100 rear derailleur delivers a low profile design that lets you ride aggressively with fewer interruptions thanks to its SHIMANO SHADOW design. Specifications Low profile design Adjustment barrel Compatible chain: Chain 9 Speeds Min. top sprocket: 12T Max. low sprocket: 36T Total capacity: 45T Cage: SGS long Gears: 9 speed Mfr Claimed Weight TBC