Shimano GRX RD-RX717 Wireless Di2 12 Speed Rear Derailleur cassons Optimally balanced hydraulic brake system

Optimally balanced hydraulic brake system for racing

Super wide gear range-a perfect fit for any ride

The right bottom bracket for SRAM DUB MTB-Wide cranks for mountain bike frames with BB89

the wind jacket is constructed from a featherweight 55gsm Italian-milled micro-ripstop with superior abrasion and snag resistance

Material: plastic

Shimano GRX RD-RX717 Wireless Di2 12 Speed Rear Derailleur cassons Optimally balanced hydraulic brake systemThe Shimano GRX RD RX717 Wireless Di2 Rear Derailleur is designed to give gravel riders the durability and gear range to pursue any off road exploration that tickles their fancy. This derailleurs wedge shaped body is filled with a low profile Shadow ES stabiliser that produces excellent chain retention and reduced chain slap over rough terrain, and the lower profile construction produces excellent clearance over trail obstacles. Because it is