and also the taper ring and crown race are machined from 2014 T6 aluminium

grabbing some shuttles

2 velcro straps

What size bikes (wheel base) can it carry: Any

there is ample room to refine and customise your bike’s feel

Shimano EW-SD50 Ebike Electric Di2 Wire - Black Images Uploaded - Ready for Review and also the taper ringThe SD50 E TUBE wire transmits interactive signals and provides power to E TUBE DI2 drivetrains. It has a compact, waterproof connector and can be easily routed internally in handlebars and frames thanks to its "plug & gap" connection. Available in various lengths. Application: Provides power and interactive signals to E TUBE DI2 drivetrains. Compatibility: E TUBE system Not compatible with Dura Ace 7970 Di2 wiring. E tube connector (QTY): 2 E tube