Bicycle Tire Leaking Valve Stem. I haven t ridden my bike since the end of the summer. The sealant in tubeless ready tires will travel with the escaping air and can seal the gaps around a loose valve.

Didn t have a problem with the front tire but when i got to the back. I m going to threadless to fix that. Schrader valves are more common.
I didn t try any pliers or anything but after trying unsuccessfully for about 15 minutes i went out and got some wd 40.
If the valve stem is leaking you can easily fix it yourself with a valve stem tool. They next tried tightening their valves to stop the leak. Rather than replacing the tire or having a tire or bike shop make this repair do it yourself in only a few. Shraeder valves can be tightened with a valve tightening driver.