Shimano EW-SD300-I Di2 Electric Wire 750mm Built-In Routing AI Patented lightweight aero spokes and

Patented lightweight aero spokes and 22mm deep/19mm wide rims keep inertia low and control high

For more comfort

Reduced friction - less noise

8 fine adjustment hex keys

The light mounts to the rear of the helmet via a velcro strap system and is compatible with almost every helmet type

Shimano EW-SD300-I Di2 Electric Wire 750mm Built-In Routing AI Patented lightweight aero spokes andShimano Ew Sd300 I Electric Wire DI2 750mm Built in Routing Features More compact design makes new electric components smaller and lighter Will potentially expand the future capabilities of DI2 systems For internal routing usage Mfr Claimed Weight TBC