Shimano Claris SL-R2000 Front Flat Bar Road Shifters (Grey) (Right) (8 Speed) - Performance Bicycle
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Universal Cycles -- MicroShift 8 Speed Road Down Tube Shifter Set - 2/3 x 8 Speed [SL-D08]
Shimano Bike Shifter Lever Claris St-2400 Hand Dial Shift 2*8-Speed 16-Speed Road Bike Finger Shift Head Shift Handle Shift Lever - China Finger Shift System, Finger Shift | Made-in-China.com
Shimano Claris SL-R2000 Front Flat Bar Road Shifters (Grey) (Right) (8 Speed) - Performance Bicycle
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Amazon.com : microSHIFT | Bar End Shifter Set | 8-Speed Road | Double/Triple | Shimano Compatible | Black : Sports & Outdoors
Complete guide to rear derailleurs: everything you need to know - BikeRadar