Product Name: bicycle speed control dial
Model: tx30
Diameter: 22.2mm
Origin: China
Suitable for: Mountain Bike / city bike / recreational vehicle / road car / folding bike
Standard configuration: with variable speed wire core, wireless tube
Material: high quality plastic
Color: black, as shown in the picture
Number of gears: front 3 + rear 6 = 18, front 3 + rear 7 = 21
(on the left is fine tuning without numbers, on the right is digital positioning)