The design of the medium cage gear lever is compatible with the different sizes of chainrings from the four cassette shifting options, ranging from 9-36 to 10-48, making it ideal for all gravel riding requirements.2D parallelogram path - precision mechanical movement specific to 13 sprockets.Special surface treatment to ensure long-term strength and resilience in the toughest conditions.Carbon fibre reinforced polyamide and anodised 7075 and 6082 alloys.Steel screws with special surface treatment.