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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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Shimano Tourney SL-RS35 Revoshift Grip Bike Twist Shifter Lever 3 * 6s 3 * 7s 18S 21s Bicycle Comb With Grips Bicycle Spare Parts (Color : 3x7 Speed a pair): Buy Online
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shimano - Why are trigger shifters so widely used, instead of the twisting grip shifters(revoshift)? - Bicycles Stack Exchange
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