Yeah, I suppose carbon of that era isn't the best route. I just noticed that Shimano 600 group (including early STI's). The OP probably needs more general 'what to look for' advice anyway rather than my list.
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"The older you do get, the more rules they're gonna try to get you to follow. You just gotta keep livin', man, L-I-V-I-N." - Wooderson
'14 carbon Synapse - '12 CAAD 10 5 - '99 Gary Fisher Big Sur