Shimano has officially unveiled electronic shifting for its 12-speed GRX groupset, seeing it draw level ... and you can choose a 1x12-speed Di2 set-up for Deore XT, powered by the e-MTB’s ...

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.

One of those things, crucially, is my Shimano 105 groupset. Every bike has one, every bike needs one, but my bike has 105, 11 ...