slow natural air loss from wheels

[saturnsc2]

everybody knows bicycle tires tend to lose air pretty fast especially if the bike isn't used. i wonder if you can see the air loss from the tires if you hold them underwater. has anyone tried this? any air loss would bubble underwater obviously. it's strange how they lose air if not used faster than if used. it seems to me it should be the opposite..

 

[DiabloScott]

everybody knows bicycle tires tend to lose air pretty fast especially if the bike isn't used. i wonder if you can see the air loss from the tires if you hold them underwater. has anyone tried this? any air loss would bubble underwater obviously. it's strange how they lose air if not used faster than if used. it seems to me it should be the opposite..

Pretty hard to find some pinhole leaks under water - the leak rate is so slow, and that would be about 100 times faster than normal diffusion through a healthy tube.