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Old 06-14-2021, 07:00 PM   #1
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Tire Pressure

Iím a little confused over tire pressure. My 2012 Allegro Open Road 32SC has specs showing tire size at 235/80 22.5. Can someone tell me the normal recommended tire pressure? Iím dealing with a virtually unloaded vehicle weight wise. Thanks.
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Old 06-14-2021, 07:16 PM   #2
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I think I would start with the specifications on the placard on your RV, see what the recommended tire pressure is (assuming the tires on the vehicle match the placard specs in terms of size).

Then you should also look at the maximum cold tire pressure on the sidewall of your tires. Then you;ll know what pressure you should not exceed cold.

Many tire manufacturers post a table online to tell you what pressure to run in your size tire at what weight.

Of course that would require you to go to a CAT scale and learn exactly how much weight each tire is carrying "empty." Your GCWR seems to be about 22,000 lbs., assumedly less if you are pretty empty. You would divide the front axle by 2 (tires) and the rear axle by four (tires) assuming you have dually tires in the rear.

Of course your RV is heavy enough "empty" so you will have a significant load right there. But a CAT scale will really help you to know what load each tire is carrying.
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Old 06-15-2021, 04:19 PM   #3
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Thank you for the information. I was hoping for just a simple idea as to what the tire pressure being used by owners of an 2012 Allegro 32SC was. I have TOYO tires (245/75 22.5) that take a maximum of 110PSI but which are pressurized to 100PSI. The original Michelin's were the 235/80 22.5 and but were only being pressurized to 90PSI by the previous owner. I think it makes a ride difference, but not sure. I don't load down my RV with weight so it's rather close to the manufactured weight on the road.
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Old 06-15-2021, 10:04 PM   #4
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For a simple answer, I run 80 psi in my tires.
Wade & Debby Griffin
2018 Tiffin Allegro Open Road 32SA, Ford F53 24K Chassis
2012 Jeep Liberty
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Old 06-16-2021, 05:09 AM   #5
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Sparkr, I think the challenge you have in asking folks with a similar RV what pressures they run is that there can be variations in tires: manufacturer, size and load carried for each vhicle which might make a simple answer like "I run my tires at 95psi" less applicable to your situation than you might think. Then, as you mention, there could be certain driver's preferences for a softer or harder ride.

I do think you are always smart to get a CAT scale weight and see what load your tires are actually carrying. There is usally a surprise there in that information somewhere. We usually think we are "lighter" than we are.

One more thing: I previously wrote "Your GCWR seems to be about 22,000 lbs..." I made a typo here and meant GVWR. Sorry for any confusion.
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Old 06-16-2021, 07:00 AM   #6
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Hi I second getting to a scale. After you get the axel weights, go to the Toyo pressure chart and inflate/ deflate to correct pressure. We run different pressure in the front and rear. Stan
Stan & Mary, and Lucy a Canine Princess in Training....

2021 Tiffin Allegro Bus 35cp, 2014 Cadillac SRX toad
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tire, tire pressure

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