03-12-2014, 03:38 AM
You would have to upgrade the full drivetrain to 9 or 10 speeds. This is (economically seen) usually a stupid idea, unless it is a really nice frame or you really, really, love the way the bike handles, or have some deep, sentimental attachment to it.
Although... as you already have an 8 spd drive train you could get away with just a new shifter and a new rear dérailleur (plus cassette and chain, cables, housing, basically consumables), keeping crank set and FD (and its shifter) would likely work. Since the shifter is the most expensive part (maybe apart from the crank set) and you need it anyway you could do justify it.
Although... as you already have an 8 spd drive train you could get away with just a new shifter and a new rear dérailleur (plus cassette and chain, cables, housing, basically consumables), keeping crank set and FD (and its shifter) would likely work. Since the shifter is the most expensive part (maybe apart from the crank set) and you need it anyway you could do justify it.
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