Shimano Tiagra is a popular groupset on many entry-level road bikes and sits one notch below 105 in the brand’s groupset hierarchy. Tiagra 4700 looks to be filled with trickle down technology and aesthetics seen in current 11-speed Dura-Ace, Ultegra and 105 groupsets. Also announced is a new 105 level hydraulic disc brake system and Ultegra caliper, the brand’s first road disc brakes to receive official groupset labels.
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.
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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.
Another key change is a move to a stiffer and lighter four-arm 110BCD crank design, enabling easy swapping between 52/36 and 50/34 chairing sizes. A triple option has been pictured too, although it's unclear if this will be a separate crankset to the interchangeable double option.
Shimano 105 hydraulic disc brake
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