Quote:
Originally Posted by wdb
Not incorrect at all. Perhaps it is the valve stem on a car that is rated lower, but I assure you that valve inside the stem can take 100 psi without blinking. I've done it for years as have millions of other cyclists.
|
I'm with you. testing thousands of tires on street and on track as well as run to destruct tests never had a tire stem failure. Many of these tires went well beyond 200 psi before failing, usually around the rim. but not at the stem.
The force exerted on a quarter inch area of a valve stem by 200 psi is only 50 pounds. A tire installer needs a lever and considerable force to remove an old but good stem.
The force exerted on a 15" sidewall of about 1200 lb per inch of rim so you would expect the tire to fail at the weakest point on the rim. And so you do.