a Chester post will serve you well

Lightweight design

muddy riding conditions

and any other sliding or pivoting parts that require a super-slick yet mildly tacky grease

Length 50mm (Center-to-Center)

SHIMANO E-Tube Di2 Wireless Unit - Inline wahoopromo a Chester post will serveShimano's EW WU111B D Fly wireless unit connects inline to a Di2 E TUBE system enabling the use and connectivity of ANT+ and Bluetooth LE compatible accessories. It also allows the use of SHIMANO's smartphone and tablet E TUBE PROJECT software for maintenance and system update Compatible with Shimano Road Di2 systems Compatible with Garmin Edge 1000 and PRO SCIO ANT+ cycling computer Powered by Di2 shifting system battery Dimensions: 38mm x 25mm x 12.