Shimano 5603 and 6603 chainsets
just been onto ebay and have seen that both 105 (5603) and Ultegra (6603) chainsets are advertised as being compatible with 8,9 or 10 spd drivetrains. Is this true??? Ideally I'm after a 9 spd chainset but if these 10 spd chainsets really are compatible with 9 spd then I'm very tempted.
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