This is the answer to all of us who want electronic shifting but can't afford it. Shimano takes the next step and announces a lower cost version with the Ultegra Di2. It allows fora 28 tooth gear in the rear which is good. It has the sizes we want:
- standard Ultegra with chainset options of 52/39, 53/39 and 50/34
- arm lengths of 165,170,172.5 and 175mm.
- Weight-wise its 790g including the bottom bracket (788g for the compact 50/34)
- Shimano cassette choice is from 11-23,12-23,11-25,11-28\
So this is a great choice for gearing (53/34 and 11-28 combination).