Radial Tires air pressure

wolfman · Oct 19, 2011

I have a pair of radial 16.9-28's. With 12 PSI of air, they mashed a lot carrying a rotary mower, etc. So I tried 15 lbs. What is the recommended pressure for these radials?

Dell (WA) · Oct 19, 2011

wolfie.......unlike bias ply tires, ALL radial tires look like they's squished out on the sides even with excessive pressure. It ain't the size of the tire ittza LOAD they's carry. 12psi is just fine on 19.9-28's. .......the tired Dell

buickanddeere · Oct 19, 2011

How much weight on the rear axle? The tire manual states the tire psi to match the load. Sometimes as low as 6psi.

JDseller · Oct 20, 2011

I have a JD 5210 with 16.9 x 28 tires. They are Bias. I run 18-20 psi in them to keep them from cheeking too bad. You are not worrying about compaction with a small tractor so why under inflate the tires??? They can be run up to 30 PSI according to the operator manual.

bruster · Oct 20, 2011

One the tire side wall somewhere there will be a RECOMMENDED tire inflation. Typically, radials will have a higher PSI than bias.

RodinNS · Oct 20, 2011

Go to the tire manufacturer's website or your operators manual and look for a tire inflation chart. The website will have that somewhere with their tire spec/data.
You need to know the weight (approximate) that the tire is carrying, then inflate to chart specs for that weight.
I've run as low as 12 and as high as 20 on mine depending on what I'm carrying.
You also need to remember that radials with tubes are VERY sensitive to low pressure, particularly with high torque loads. Run it too low... even for an hour. Buh bye ole tube. I've sheared so many valve stems off that I've flat out quit installing tubes. Every one of mine... as the tubes fail... goes on tubeless without ballast. Funny thing is... in most situations they pull just as much or more than they did WITH ballast.

Rod

hd6gtom · Oct 20, 2011

Wolf man That is the way they are supposed to run, at least thats what the Michlin/Firestone/Goodyear/Titan farm tire represenatives told me.

hd6gtom · Oct 20, 2011

NOT trying to hijack this post, Rod were you using the heavy duty radial tubes, there is no comparrison between them and a standard duty radial tube.

RodinNS · Oct 20, 2011

Yep. The Firestone natural rubber tubes last somewhat better... but not that much. I'd still lose a tube a year per wheel...
I find the Michelins are worse because they flex so much in the sidewall. If you air them up you can keep a tube in them... but the way I see it... if you air them up THAT much you may just as well have a bias at half the price.
If the tires are dry then there is no problem with tubes. It's just the combo of tubes and loaded radials...

Rod

Radial Tires air pressure

wolfman

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Dell (WA)

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buickanddeere

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JDseller

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bruster

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RodinNS

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hd6gtom

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hd6gtom

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RodinNS

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