Cambiador de empuñadura giratoria Shimano RevoShift SL-RS25 -6 velocidades derecha negra nueva EE. UU. | eBay
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
Genuino SHIMANO Revoshift SL-RS41 Twist Shifter 3*7S 21S caja de cambios de bicicleta RS41 palanca de cambios de agarre - AliExpress
SHIMANO TOURNEY Right Shift Lever 6-speed | SHIMANO BIKE-EU