GX Type 2.1 Rear Derailleur 10 Speed Medium Cage Black bidon It features a pre-molded shape

It features a pre-molded shape that matches the curve of your saddle

so it fits close to the body without being constricting

Computational Fluid Dynamic design integrates the maximum volume of internal channeling for optimal airflow through the helmet drawing heat away from the head

and with Kindbeam to keep light on the trail and out of oncoming riders' eyes

weight-cheating grip that provides the comfort and support to keep accelerating for as long as necessary

GX Type 2.1 Rear Derailleur 10 Speed Medium Cage Black bidon It features a pre-molded shapeGX Type 2. 1 Rear Derailleur 10 Speed Medium Cage Black. Sram Part Number 00. 7518. 080. 001