found out why my front tires leak.

[08quadram]

Topped off my tires last fall and have had no problem keeping them up before. We just got our first snow where I can use the bx (first winter). Front tire was flat. Apparently when its cold the valve stem shrinks enough to allow it to spin easily in the rim. Wiggle it and it leaks also. I think I'm heading for tubes.

 

[North Idaho Wolfman]

I've had a few with problems like that, go to an auto motive store and get the steams with the nuts that you can tighten.

 

[olthumpa]

What Wolfman said. I have 5 on different things and several spares. They work great. They cost more but worth every penny to not have a flat tire when you need to use something.