Shimano Tourney SL-RS45 3x8 Speed Revo Shifter Set Black-Silver
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SHIMANO TOURNEY Left Shift Lever 3x7/6-speed | SHIMANO BIKE-EU
PAIR SL-RS40 GENUINE SHIMANO REVO SHIFT 3 x 7, 21 SPEED TWIST GRIP IND
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