Originally Posted by
OUGrad05
My hydro mtn bike has been hanging upside down for 7 years, no issues, sometimes for extended periods of time. That's interesting that you had a brake issue, not sure it was related but maybe it was? You could hang them against the wall like one of the other posters was doing.
Probably the position of the reservoir given the different ergonomics. FWIW, Shimano explicitly states that road hydro bikes shouldn't be put upside down.
edit:
The disc brake is not designed to work with the bicycle upside down. If the bicycle is turned upside down or on its side, the brake may not work correctly
I haven't had any issues whatsoever transporting my bikes on their sides, though, even with 1500+ mile road trips.