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Amazon.com : Shimano SL-TX50 Tourney 7-Speed Right & Left (SIS) Thumb Shifter Set : Bike Shifters And Parts : Sports & Outdoors
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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 SIS SL TX50 Bicycle Shift Lever 3*6s 3*7s 3v Left 6v Right 7v 18 21 Speed pair SL TX50 shifters gear cable|Bicycle Derailleur| - AliExpress
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Amazon.com: Right Thumb Gear Shifter SL-TX30-6R,6 Speed Bike Shift Lever for Mountain City Road Folding Bicycle : Sports & Outdoors
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Amazon.com: Shimano Bike Shifter SL-TX30-7R,7 Speed Mountain Bicycle Right Thumb Gear Shift Lever : Sports & Outdoors
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