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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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maintenance - Searching model number of Shimano shifting lever - Bicycles Stack Exchange
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