You sure about that Tiagra crankset? This one shows 42 teeth on the middle ring. Is there such thing as 10-speed Tiagra? Certainly an older Tiagra FD would work.
http://www.jensonusa.com/store/produ...+Crankset.aspx
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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