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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 Sl-rs35 Tourney REVOSHIFT 3x 7 Right Left Grip Twist Shifter Set Ergo for sale online | eBay
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SHIMANO SIS RevoShift SL RS35 RS45 47 Bicycle Derailleur 3 * 6 / 7 Speed 18/21 Speed MTB Mountain Bike Folding Bike Shifter - Buy cheap in an online store with delivery: price comparison, specifications, photos and customer reviews
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