![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 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](https://preview.redd.it/xbz2kfj9mbx01.jpg?width=640&crop=smart&auto=webp&s=0724aaeb6ddecfbf6e1f3e362abb47c1ce27283e)
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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Shimano Bicycle Derailleur RS35 RevoShift Easy Gear Changing Shift Lever 3*6/7 18/21 Speed MTB Mountain Bike Folding / City Bike|Bicycle Derailleur| - AliExpress
![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 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](https://m.media-amazon.com/images/I/51ZJaavv9AL._AC_UF1000,1000_QL80_.jpg)