@neobiker: Yishun is a really big OEM. If they create new models, those are initially open to OEM customers only, as they take up all the capacity anyway. Only when initial OEM demands die down, do they become open to retail customers.

@ENEP: Yeah, "stopwatch" is just bike computer It's just the standard carbon mount. Works fine, but it's easy to overtighten the little screws that hold in the adapter plate (for switching between Garmin, Wahoo, etc).

Okay so without battery means you will still get the hollow tube shaped holder for actual batteries which are 14500 type. Any idea if the interface/wires are Shimano Di2 compatible, in case someone needs extra or longer ones? From the pictures the port does seem similar to Shimano's.

You can also check out Yishun, which is the OEM behind Light Carbon. They offer a wider selection of frames. I've recently built-up their R086D race frame:

https://www.yishunbike.com/product/r086-daero-road/

Quality was excellent. The only downsides are that it's press-fit only, and they don't do painting on single-set orders, so you'd have to paint it yourself, or find an affordable painting service near you.

If you spec the ERX version to pair with Shimano Ultegra-level components (crank, chain, cassette, rotors) you are looking at around $1500 which is still cheaper than a complete 105 Di2 yet much lighter.

GC Performance latest video shows the ERX being comparable in weight to Sram eTap Red. And in general, Di2 is lighter than eTap.