Aresvns Bike Speed Shifter, 3x7 21 Speed Bicycle Derailleur Shifter Lever with Twist Grip Gear Transmission for Mountain Bike Bicycle

• 【Experience 7-Level 21-Speed】: Specifically designed for 7-level 21-speed mountain bikes, featuring a 0.9-inch inner diameter for accurate and fluid gear shifts.
• 【Premium Quality Material】: Crafted from high-grade rubber, these handles offer a soft, comfortable, and anti-slip grip, elevating your riding comfort.
• 【Enhanced Performance】: Improve your mountain biking with this complete 21-speed transmission set, including shifter and handle grips for both left and right sides, ensuring effortless gear changes.
• 【Simple Installation】: Enjoy an easy setup process and a swift learning curve, enriching your cycling adventures without delay.
• 【Satisfaction Guaranteed】: With our 180-day unconditional return and refund policy, rest assured of your purchase. Our attentive customer service team is just an email away for any assistance, ensuring a joyful and confident riding experience.

7 LEVEL 21 SPEED: The inner diameter of this bicycle transmission cycle shifter is 0.9inch, which is very suitable for 7 level 21 speed mountain bike or bicycle.