Shimano BMR1 and BRM2 Di2 External Battery Mount Base Unit A CheckoutSpec= and Bushing Assembly Kit Rim Internal Width 20mm Rim

Rim Internal Width 20mm Rim Tape Material Rubber Wheel Diameter 26 Wheel Diameter 26'' Rim Internal Width 20Mm

grip color black clamp color silver length 85mm diameter -

Works great under helmets

High grade polymer pulley wheels (12T upper 14T lower) allow for smooth chain running and secure retention

50mm reach with 6

Shimano BMR1 and BRM2 Di2 External Battery Mount Base Unit A CheckoutSpec= and Bushing Assembly Kit Rim Internal Width 20mm RimShimano Di2 External Battery MountsAll Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions Use Di2 system checker to update component firmware from http: e tubeproject. shimano. com