
It’s been more than a decade since Shimano last gave Tiagra a full overhaul. While the 105, Ultegra and Dura-Ace gruppos surged ahead with extra gears and new tech, Shimano’s workhorse road groupset quietly held the line at 10-speed. That changes for 2026.
The new Tiagra R4000 is a fully refreshed 2x11-speed mechanical groupset that not only adds an extra cog but also reduces system weight by more than 200 grams compared to previous configurations.