Flat tire

[openorice]

My right rear tire goes flat when I get into deep snow and spin the tires. I can ride on it all day with no problem but when I get into a situation where it spins it goes flat. And if it just sits it will hold pressure for weeks. Any ideas?

[Macgyver55]

Just a thought......check your valve stem right where it comes out of the rim. Could be a small cut that is opening up when the pressure of the snow is against when it is spinning. Fill the tire, wiggle the stem and listen for a leak.

[Black_Bay]

I wonder if your rim is spinning inside the tire.