My only concern with having two different groupsets would be interchangability of the stock of spares I already have. Boreas and the TCR are both similar setups and I know I can swop parts at will. In practice the only bits I do change round are the wheels but in the spares box are Front and rear deraillers that are there just in case I need them.
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How long was I in the army? Five foot seven.
Spike Milligan