I wonder what a wheel upgrade would do to the 'slightly slower/dead' feel. I'm sure you have nicer wheels on your Tarmac? Or are you mostly comparing with other's stock wheelsets as well?
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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