Originally Posted by 85MH325
That's exactly what happens... the valve stem has a crack, lets air leak out, the tire overheats and either blows out or just comes apart as a high-speed flat. Unfortunately, there's usually not enough left of the tire to tell what actually occurred... and when they replace the tire, the tire buster just pulls the old stem and pitches it... so very few of them are diagnosed.
That's what happened to me, except for the blowout part (thanks to the PressurePro tire monitor), on a recent trip to Florida. I was doing under 55 MPH when the monitor alerted. I pulled over and confirmed the pressure drop, which had dropped to 36 PSI, with a tire gauge. After I got it changed, I noticed the tire had stopped deflating at 27 PSI. After inspecting the valve stem, I found it was cracked at the base, and audibly leaked when flexed. Easy fix... this time.
I plan to replace the 4 year old tires and get metal valve stems all around. After reading some of the horror stories on some of the tire threads, I'm still pondering which tires to buy. Since I'm only riding on two, I'd like them to be the best available.
BTW- Congrats on your Airstream, Chief.