Updated Tiagra groupset features improved braking and chainset options

Shimano has updated Tiagra level disc brakes and chainset to boost performance

Often seen as the first 'proper' groupset in Shimano's road component range, the ten speed Tiagra 4700 groupset has seen a raft of trickle-down updates to see it brought even further in line with higher level Data-Ace, Ultegra and 105 systems.

Slimmer and more sculpted Tiagra levers.

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