At the end of the day...there really is not a whole lot of difference. If I'm not mistaken, the difference between the headtube height of a race/endurance geometry bike is less than an inch. This is not earth shattering stuff...
Ok, I couldn't help myself..looked up specs on a 56cm Synapse and a 56cm Supersix
Stack / Reach
Synapse 59cm / 38.6cm
Suypersix 56.7cm /39.3cm
Those differences are within a few spacers or swapping out a stem. Essentially the same bike, depending on setup.
Last edited by Abe_Froman; 10-09-17 at 01:06 PM.