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My daughter's Trek came with a 6-speed Shimano Revoshift SIS Index. It's a new bike. She can shift to higher gears easily but does not have the grip strength to shift back
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Amazon.com: ZUKKA Revoshift 6 Speed Shimano Right Shift Lever SL-RS35-6R Bicycle Twist Shifter Lever Mountain Bike Commuter Bike Folding Bike : Sports & Outdoors
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Amazon.com : MOHEGIA Revoshift SL-RS35,7-Speed Bike Right Shift Lever for Mountain Bicycle : Sports & Outdoors
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Shimano Sl-rs25 Mountain Bike Revoshift Shifter Clamp Band 3x6 Speed Iamok Bicycle Parts - Bicycle Derailleur - AliExpress
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