Originally Posted by
oilman_15106
OP - you may inadvertently unscrewing the valve body(core) when you are airing up the tires. If the valve core is not all the way screwed down you may have a very slow leak. This only applies if the tubes you are using have a removable core. If so take a set of needle nose pliers and screw in the valve body real tight.
Damn....the washer that holds the stem comes loose routinely too. I hope it is that simple. These issues always come down to something obvious.
So before my next ride I should tighten the valve stem washer with pliers, inflate and hope for the best ?