SHIMANO 105 RD-R7150 Rear Derailleur 12-Speed Small Parts – Pit Crew Cycles
Installing a Shimano 105 RD-R7150 rear derailleur onto a 2019 Checkpoint SL5 and I'm having trouble determining whether or not I need the mounting piece circled. Googling only made me more confused.
Shimano Tiagra vs 105: Which One Should I Buy? - Sportive Cyclist