Originally Posted by
wphamilton
I've seen that too, and ignored it telling myself that it must have been the valve not screwed down, but IME it soon goes flat again and there's a tiny hole somewhere. Nowadays, I take it off and check after a flat even if it seems to hold air.
I'm guessing there's a tiny hole and I'm just postponing the inevitable. However my studded tire is such a pain to get on/off the rim that I figure it's worth a chance.
I'm going to run down to the bike parking area in the basement and check it over lunch. I brought a spare tube so if it's flat I'll change it in the comfort of a warm area. However if it's still holding air I'll just say a prayer of thanks and leave it alone.