Blowout!

[SeaDog]

I took this picture yesterday of my neighbors cargo trailer. this spare has never been on an axle or off this mount. I checked the date code 1802 so the tire is about 16 years old, surprising the sidewalls look great.

[doc73]

I have read on here of people's tires "exploding" while sitting at storage or where ever, including their spares.

[Paulie1138]

Years ago my brother in law and I ran a test. We set an old tire out in the Arizona sun in the summer. Set pressure at 65psi. In a couple of hours, it was up to over 100psi. It blew itself up sometime during the week.

Garden hoses here will do the same if you leave the sprayer off and shut the water off at the tap. As the water heats it really expands. Assuming no leaks. Amazing how hot the water gets in a hose around here in the summer! I open the nozzle a bit whenever I am done with the hose to bleed off any pressure buildup.

Any shade here in the desert is your friend! The only part of my trailer not in shade is the back with the spare. It gets about 2-3 hours of early morning sun. Spare has a tire cover, as well as an open plywood topper I made that gets removed before heading out to keep off the sun.