SRAM Cage Lock- new bike with SRAM XO derailleur, muddy day so was washing things off and this little piece went flying. Discovered it's the cage lock, cool feature but it's ridiculously
Sram XX1/X01 Eagle Type 3 Cage Lock, Black | Bikeinn
Rival 1 Rear Derailleur | RD-RIV-1-A2 | SRAM
2021 New Sram Sx Eagle 1x12 12 Speed Rear Derailleur Cage Lock Mtb Bicycle Bike Part Black - Bicycle Derailleur - AliExpress