Shimano BT-DN320 Di2 Rear Derailleur Battery POC Material: stainless steel

Material: stainless steel

Improved front shifting performance for crisp

Seatpost: TranzX travel-adjustable dropper

Added protection against contaminants

High-stretch material

Shimano BT-DN320 Di2 Rear Derailleur Battery POC Material: stainless steelFull wireless technology means an all new Battery. The BT DN320 fits snuggly and protected within the new Wireless XTR Rear Derailleur and powers the fast and smooth shifting XTR is known for. Protected Battery Tucked safely inside an enclosed space, the battery wont budge even in rough terrain, while remaining completely removable for charging. Longevity 310 MaH provides for more riding on one charge