Shimano Tiagra 4700
Surprisingly, Shimano has kept Tiagra 4700 as a 10-speed group, despite all its more expensive groupsets now offering 11-speed. Beyond the number of rear gears, it appears a substantial overhaul has been given to the budget group.
The biggest change is a move to internal cable routing at the shifters, keeping the cables hidden beneath the bartape. Until now, Tiagra used external gear cable housing from the edge of the hood to the nearest cable stop on the frame.
The new shift/brake lever looks to share the compact shape of Dura-Ace, Ultegra and 105. 105 and above features adjustable lever reach via a simple plastic screw, and we expect a similar feature to exist in Tiagra – but it's to be confirmed.