Noel":21zhkhth said:
I disagree. Erm... a "standing" bike is supported by two rims and two tyres over a relatively large area whereas a hanging bike is supported by a very small area on the inside of one rim. Not good for the headset either. There are also issues with hydraulic components, suspension and headsets when hanging MTBs by a single wheel. Personally I would only every hang a bike by it's frame. Just because you haven't noticed or experienced any problems with your particular bikes does not mean my opinion is incorrect, if indeed opinions can be right or wrong.
Aren't you worried that hanging a bike by it's frame might make the frame sag?
That is as likely, or probably less likely, than hanging the bike by its wheels is to make the rims go out of shape.
In fact neither will damage either frame or wheels. A correctly tensioned wheel can have a force of around half a ton acting around the rim and if the rim is strong enough to cope with that it is not going to get pulled out of shape by hanging the 20lb weight of the bike on it. Bear in mind that any force acting upon the wheel is distributed throughout the wheel by the spokes and not concentrated in one area.
When you ride the bike the rim is constantly deforming minute amounts as it rotates and the tension in the spokes continually changes.
Frames too are extremely strong, as you may know you can put all your weight in the centre of the top-tube with no ill effect (other than to your own undercarriage :mrgreen: ).
Leaving a bike standing on its wheels for a long period is quite likely to damage the tyres as they lose pressure and the sidewalls distort. They will gain a permanent flat spot or bulge.
As far as the headset is concerned its bearings might actually benefit from having the forces acted upon it reversed compared to normal (as when the bike is standing on the ground or being ridden). If you you hang a bike upside down by both wheels the fork then pulls down on the bearing whereas when the bike is ridden the fork pushes up on the bearing.
So I think your fears are unfounded and that you needn't worry that your bike might suffer if it is hung up by its wheel or wheels.