![Universal Cycles -- Shimano Rear Derailleur Barrel Adjustment Units [Y5ZR98030, Y5XX98040, Y5X098030, Y3E998030, Y5YC98030, Y3F398030, Y5XG98040, Y5VA98030, Y5V898030] Universal Cycles -- Shimano Rear Derailleur Barrel Adjustment Units [Y5ZR98030, Y5XX98040, Y5X098030, Y3E998030, Y5YC98030, Y3F398030, Y5XG98040, Y5VA98030, Y5V898030]](https://www.universalcycles.com/images//attributes/large/277585.jpg)
Universal Cycles -- Shimano Rear Derailleur Barrel Adjustment Units [Y5ZR98030, Y5XX98040, Y5X098030, Y3E998030, Y5YC98030, Y3F398030, Y5XG98040, Y5VA98030, Y5V898030]
![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. 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.](https://external-preview.redd.it/installing-a-shimano-105-rd-r7150-rear-derailleur-onto-a-v0-wzcYiuIY2HFJ-rsyaa6AR6SZhFLviiPYpQ62raxilEg.jpg?width=640&crop=smart&auto=webp&s=9060c339a593e39846d723fb446ba5f7ecd7b383)
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.
![For Shimano Di2 12s Rear Derailleur Stay Cable Guide 105/Ultegra/Dura Ace 7150/8150/9250 Y3GK51000 - AliExpress For Shimano Di2 12s Rear Derailleur Stay Cable Guide 105/Ultegra/Dura Ace 7150/8150/9250 Y3GK51000 - AliExpress](https://ae01.alicdn.com/kf/S6d9f1e483b7b427a9a500745114a76dfZ.jpg_640x640Q90.jpg_.webp)