Shimano's road bike groupsets are the most commonly specced on complete bikes. They top out with Dura-Ace Di2, a 12-speed electronic groupset that's the most used in the pro peloton.

Rather than overhauling the system, Shimano has brought updated tech from its electronic road groups over to its 2x12 gravel-specific platform. The announcement came just in time for next weekend ...

It turns out that’s not the whole story: GRX is compatible only if your existing parts didn’t exist before 2016, the year in which Shimano tweaked its one remaining 10-speed road group to shift like ...