SW-RS801-S

Brand: Shimano

Satellite switch of 12-speed Di2, short-cable version, sold as a pair and taped under the bar tape in the drops — the sprint position. It does not plug into an ordinary SD300 port but into the dedicated satellite port of 12-speed levers, which rules out the 105 Di2 ST-R7170, which has no such port. Shimano quotes 6.4 g per pair. The SW-RS801-T is the long-cable version, for the tops.