Inflating Tires?

are you sure it's certified, and not certifiable?

 

Christalmighty....

Did the "teacher" let you turn the key yourself at this school?!?

As someone noted, this is likely a hold-over from the split-rim days (decades ago trucks ran on two-piece rims, where you had the rim itself, and a retainer ring) and tube-type tires. If the retainer ring on the split rim didn't seat properly it could fly off the rim with tremendous force while the tire was airing up. This is what tire-cages were invented for. Many tire shops still utilize tire-cages. And before the two-piece split rims there were three-piece split rims (the rim itself was in two pieces along with a retainer ring).

A tubeless tire, which runs on a one-piece rim can become a danger if either the rim is damaged, or the tire is damaged in such a way to cause it to fail, or if the tire is significantly overinflated. Incidentally, most trucks actuate the purge valve on the air-system at 120psi, so, this means, barring the rim or tire being damaged, or your purge valve working incorrectly allowing the air-tanks to overcharge, you won't overinflate a 120-psi tire. Most tires anymore are 120psi, some are 105 and a 110. Watching it with a pressure gauge and periodically popping the chuck off to check the pressure will keep you from overinflating if you use your head.

Two-piece split rims are still legal, though extremely uncommon. The old three-piece split rims are the only type of rim, to my knowledge, that DOT has banned.

 

Pribably after being told to put on hazmat and a bmob squad suit, sure.

...you should probably read the whole thread if you didn't. Just FYI.

 

Yeah split rims about 30 years ago were dangerous! If it was dangerous these days, every business decent enough to have an air hose, would be in a lawsuit.

 

LOL...... It is amazing what gets passed on. Of course it is safe to fill a tire. I wonder if the instructor ever called road side assistance for air.

 

80% of the intermodal chassis on the road use split rims, also still very common in farm country. had a blow out on a chassis one day, rolled up to a tire shop, all 3 tire guys standing front did a great "3 monkeys" routine looking at that thing. All 3 were under 25, the owner, looked to be maybe Christ's younger brother, had to put on coveralls and teach them how to change it.

 

Thanks I thought they were. ...I air them up all the time. I knew there was a danger but not this bad. Maybe if I fill it up to 80psi or 90 it shouldn't be bad

 

He's right, they will not fit on my truck... They are too small!