Technical specifications:

Material: aluminum, stainless steel, glass fiber reinforced plastic
Version: 11-speed
Compatibility: 11-speed Shimano shift / brake lever
Total capacity: 31 teeth
Max. Front difference: 17 teeth (difference between the smallest and the largest chainring)
Max. largest sprocket: 42 teeth
minute largest sprocket: 40 teeth
Max. smallest pinion: 11 teeth
minute smallest pinion: 11 teeth
Fixing: direct mounting
Color: black / silver