Amazon.com : SHIMANO RD 5701 105 30T Max Rear Derailleur, Black, Medium Cage : Rear Bike Derailleurs : Sports & Outdoors
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.
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