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Old 09-16-2013, 08:23 PM   #1
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tire pressure

I have a 40dst Monaco Diplomat with new Hankook AH12 275 75R 22.5 tires, the mfg calls out 131lbs max. any suggestions on what I should run for pressure. I know many will ask what is my weight, and I don't know yet.
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Old 09-16-2013, 08:42 PM   #2
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Welcome to the forum.

You already know how to get to the proper PSI for your rig. Until then, most agree that inflating to the PSI listed on either the tire sidewall or the placard mounted inside the coach is a good strategy.

I did that on my 40DP and really felt I had made a mistake by buying this coach. It nearly jarred the fillings out of my teeth bouncing down California interstates.

Once I got it weighed and adjusted the pressure accordingly it was much smoother.

You'll probably get some better technical advice from one of our tire experts more familiar with your brand.

Good luck.

Rick
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Old 09-16-2013, 08:43 PM   #3
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BTW... that 131 PSI sure sounds high to me.
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Old 09-16-2013, 08:51 PM   #4
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I found a 2012 Hankook truck tire inflation table online here: http://wholesale.lindertire.com/asse...TBRCatalog.pdf

On p25-26 the table shows a 275/70R22.5 not a 275/75R22.5 and the pressure at full rated capacity is given as 125 psi. At that pressure the tire has the same 6940 lb load rating as the same size Michelins I have on my MH. You might want to double check your numbers.

I totally agree with those that are telling you to get your MH weighed ASAP. I wouldn't use the placard inside the MH unless you have absolutely nothing of yours inside and even then I wouldn't trust it. I'd use the 125 psi number even though the ride will be unnecessarily harsh.
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Old 10-12-2013, 02:10 PM   #5
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Need Tire Presure Help

I am new to this site and RVing. Got 225/70R/19.5 tires on my Winnebago Vista 26p. Tires say 110 psi, Winnebago plate inside says 85 psi single and dual. They currently had 70-75 in them when I picked up at dealer. Suggestions??
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Old 10-12-2013, 02:28 PM   #6
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You should have a chart listing TPs for varius weights. Your best bet it to weigh the RV and use the chart.
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Old 10-12-2013, 03:31 PM   #7
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Hi 1948boat,
The rear tires are easier to lower the PSI than the front. I have the same size tiers as you. Michelin are on my coach, but the brand is irrelevant. The Michelin chart shows 20K at 90 PSI. Assuming you are not over GAWR one could lower the rear tires to 90-95 PSI and feel comfortable. One can do the front axle the same way. Determine the front axle GAWR. Put the tire PSI to carry that weight. It should be less than the 125 PSI maximum for the tire. Don't forget to check the rims to see what their maximum PSI is. The rims could have a maximum PSI less than the tires!
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Old 10-12-2013, 04:48 PM   #8
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Quote:
Originally Posted by gmar4718 View Post
I am new to this site and RVing. Got 225/70R/19.5 tires on my Winnebago Vista 26p. Tires say 110 psi, Winnebago plate inside says 85 psi single and dual. They currently had 70-75 in them when I picked up at dealer. Suggestions??
Welcome to the forum.

My suggestion would be to get your rig weighed. All four corners would be good but getting axle weights would be OK too. Then go to your tire mfgr's website and look up their PSI tables for your axle weight. That will give you your proper PSI per axle. Many of us will add 5 psi to that as a bit of a safety factor.

Best of luck.

Rick
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Old 10-12-2013, 05:51 PM   #9
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The tire manufacturer should have a weight chart that you can reference to. I have Goodyear 275/70r 22.4 on my 41ft Discovery. I keep my front tires at 105 and my rear tires at 95.
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Old 10-12-2013, 10:05 PM   #10
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i have bf goodrich 12r22.5 tires. on my wall placard, cc specifies 120psi for front and 115psi for rear. i called cc tech adviser and he told me by his tech book 120/110 f/r is correct. now i set 115psi for front and 110psi for rear. driving is smooth and light, a right balance in rolling and comfort.
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Old 10-13-2013, 07:07 AM   #11
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The next time you are fueling at a truck stop, get on the scale on the way out. This will tell you the weight of each axle. Then go to the tire manufacturer's website and look up the proper pressure.
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