>>1630997Why don't you try it?
I mean, how is this even a doubt?
Take bike
Ride bike tucked down
Ride bike sitting up
Compare
I only feel significant difference above 30 km/h.
Today I got to 55 and only tucked down, if I raised myself I would instantly see the speed lowering a little bit (not pedaling).
If you don't ride that fats than it's pointless.
If you want to ride that fast than it is necessary