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Split Ring Tire Question

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I should not but will share another.

Working in Tacoma WA, one of our top tire salesmen got a call, his son (ran a service truck) was down the road and just had a accident.

He (father) was the first on the scene, grabbed his son by the legs and pulled him out from under the service truck ... he (son) was decapitated.

 

The goal was to put the tire under the truck, air it up and if it exploded it was contained, the trucks had no cage on them.

The tire exploded while he was under the truck to remove it.

No clue what type of wheel it was.

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Some real horror stories here.  My '49 has (3) original rims with the split rings, and (1) true widowmaker split rim.  I had a local place put new tires on the rims very recently and all went well, but the guy who did it was definitely wary of the widowmaker.  He only filled it up with 40 psi at the shop and recommended that I use it for the inside tire of the dual tires in back, have it fully mounted with the other tire in front of it, and to then fill it up all the way to 100 psi.  No problems at all with the tire, but it was definitely in the back of my mind.  Whenever I'm going to take one of those tires off, I plan to take the air out of it before I remove the lug nuts and take it off the truck.

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I don’t know about “Seating” a bead at 100PSI, but I would think your head stands a good chance of being “Unseated” from the rest of your body at that pressure with a split ring wheel. Ouch!!!!!!!

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Max PSI is for Max load. Unless you are using your truck as it was used "back in the day" you could run with a lower pressure and improve the ride quality. Bring the pressure down until you see the tire start to squat a bit, then add 5 lbs.

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35-40 in my 1 ton (all new tires and tubes)   
,  40-45 in the 2.5 ton on the front (near new)  and 35 in the rears.

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My work van had 10 ply tires on it, max pressure was 80 pounds.

I typically ran with 40 in the front and 45 in the rear, unless going to haul a load I would pump them up to 70 or so.

 

Max air pressure was explained to me as max load rating.

If you have a chain hoist rated max load of 2k pounds, you do not want to go over 2k pounds.

But you can use that hoist all day long lifting smaller loads.

 

Same with tire air pressure, Max on the sidewall is what you do not want to exceed, you also do not want to run under inflated.

5 hours ago, Merle Coggins said:

Bring the pressure down until you see the tire start to squat a bit, then add 5 lbs.

This is excellent advice.

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I'm running 45psi in my one ton.....that is what the tire store set them at and I like the bouncy ride, it keeps me humble and keeps me awake :)

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The 10 plies on my daily run at 60, rated at 80.  I'm not a fan of sidewall flex especially when towing.  I used to tow a lot of farm equipment with it and I maxed the psi out when I was in the business.  It doesn't get heavy loads now but the 60 psi helps a bit with the gas mileage.  45 makes the truck feel a bit squirrelly when cornering or with a load.. 

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The new tires I bought are heavy duty tires.  The fronts are 8R22.5, basically semi tires, very heavy duty radials and solid 1-piece rims. They’re rated for 120 psi max.  I don’t know if I’d want to run them below 100 psi.

 

The back tires are 7.5x20’s with tubes on a combination of lock-ring rims and widow-makers.  Tires are bias ply and rated for 110 psi.  Although I was very careful mounting and inflating them, I didn’t give much thought to whether the original rims could handle today’s tire pressures.  It’s a great point that I need to noodle on a little.  I may take a little air out of the rears.

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