GX – Compatible with Shimano Dyna-Sys and SRAM MTB Deraileurs – Gevenalle
2Pcs 3 x7 21 Speed MTB Mountain Road Bicycle Shifter Bike Thumb Gear Shift Set | eBay
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Mountain bike handlebar with 8-speed shifter. Close-up. Green grass on the background Stock Photo - Alamy
Amazon.com: SOONHUA Bike Speed Shifter,TX-30 Right Thumb Gear Shifter,1 Pair Mountain Bicycle Gear Shifters 3X7 Speed Shift Lever and Set with Gear Indicator for Road Bike,MTB : Sports & Outdoors