In this case, Shimano went off book with their DI2 groupset, leaving [kwakeham] with a reverse engineering job on his hands. [kwakeham] gives us a great example of how to approach reverse engineering.

A full charge lasts roughly 750-1,000 kilometers, about the same as Shimano's claims for its Di2 system. SRAM claims around ...

The R872 Disc comes in three different trim levels: Sport ... because despite Shimano's ageing 105 now seen as a fairly tried and tested groupset, there are much better systems on the market.

Argon 18 Equation $3,200 The Argon 18 Equation is an entry-level carbon road bike that delivers a high-quality endurance ride ...