Shimano, however, has taken a different approach: while its 12-speed mechanical GRX groupset offers a 1x option, the electronic Di2 version remains staunchly 2x-only. At first, it was easy to ...

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.

Recently, Shimano was at the pointy end of this spear ... These could hint at backward compatibility with current-generation 12-speed Di2 GRX groupsets, allowing for 1x12 gravel options.

The new Ultegra RX derailleur comes in mechanical RD-RX800-GS and Di2 RD-RX805-GS models. Both use the company’s Shadow technology and have the same low-profile appearance as the R8000 and R8050 ...