Shimano Tiagra goes 10 speed for 2012

Shimano Tiagra 4600 2012 10-speed groupset

Next year will see 10-speed gearing trickle further down the hierarchy of Shimano componentry with the recently announced 2012 Tiagra 4600 groupset.

The mid-range gruppo gets a massive facelift, gaining the newer STI lever shape, matching everything from 105 upwards.

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