Originally Posted by
shelbyfv
I need to store a bike with Shimano GRX brakes. It's most convenient to hang it vertically by the rear wheel. Is this likely to mess up the brakes? I think I've read you shouldn't turn the bike upside down but otherwise I haven't a clue. Thanks.
Some have reported the need to bleed hydraulic brakes after storing inverted due to air bubbles in the system.
This will vary greatly on manufacturer and model.