How To Replace Shifter Cable On Shimano Revoshift Shifters - YouTube
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
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
SHIMANO REVOSHIFT Shifter SIS INDEX 7-speed | SHIMANO BIKE-EU