Go shopping for a caliper so you can measure things , they are cheap..

Measuring things answers many questions like this..

want faster , do like the Pros do Tubular rims and tires, but the biggest drag is You.

you are sitting up, which is good , you can see better .. up there, but your chest is a larger surface area

than your shoulders when you are really bent over, like in a Racer's tuck .. for more air-Resistance..


May I suggest you are over stressing 'fast' .. or just pop out a Grand for a decent road bike .. the N+1 solution..