Wayne hit it on the head. This is old news, but from some of the comments it needs to be revisited. There was a massive recall of valve stems around a year ago. Made in China (surprise) stems rot extremely fast, sometimes within a year. TM has used these stems. There is no way to find out if you have the bad ones without removing your tires. Best to just bite the bullet and change them to metal. NOW!!! I personally feel that many of the tire problems blamed on the Goodyear Marathons should actually be laid at the doorstep of the stems...
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