knowing the top tube's measurement isn't enough to base comparisons on. the prescribed and/or resultant angles are going to dictate whether two similar tt lengths are 'truly' equal. for the confente in that size (61c-c) to also have a one meter wheelbase, the head angle would be quite steep or the seat angle shallow... as such, the top tube measurement would result in quite a long 'reach' once all the parts were installed. e-RICHIE Richard Sachs Cycles No.9, North Main Street Chester, CT 06412 USA http://www.richardsachs.com Tel. 860.526.2059