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Old 06-17-2011, 09:11 PM   #1
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tire inflation

okay here goes, I weighed our coach today on all four corners and am trying to figure proper tire pressures. Tire size is 295/80R22.5 Goodyear G670RV. The weights are as follows:

left frt. rt frtf. total
7300. 7560. 14,860

left rear. rt rear. total
6750. 7120. 13,870

lt tag. rt tag. total. total. ready to roll
4250. 4300. 8,550. 37,280


I'm thinking 120 in fronts
115 in the rears
85 in the tags


any thoughts would be greatly appreciated. I think I'm reading the charts correctly. Thanks
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Old 06-18-2011, 12:36 AM   #2
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Existing post on this subject, MH General Discussion; Comprehensive tire info. These post have links to the Tire Manufacturers web pages and inflation charts. Goodyear and Michelin.
Sorry I didn't read the last line of your post. They say the mind is the second thing to go ; and you can't remember what the first one was !
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Old 06-18-2011, 08:07 AM   #3
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Try here; www.goodyeartires.com/rv/tirecare
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Old 06-18-2011, 11:21 AM   #4
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Thanks for the info. Does it seem right that the tag tires would only have 90lbs of air based on the weights of 4850 when the drivers have 120 ?I'm concerned about running that low of pressure even though chart says Anyone else doing this?
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Old 06-18-2011, 12:25 PM   #5
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Sparky on my Monaco Signature I run 115 in the front, 105 on the drive axle tires and 85 on the tag.

Something wrong in your drive axle weights. So how much do you figure your total weight on the drive axle is? How much are you computing for the weight on each tire?

Also, I believe you are overweight on your front axle. What tag axle pressure are you using?

Look at the decal on the wall by the drivers chair and see what you GAWR (Gross Axle Weight Rating) is for each of your axles.

My Signature has around 13,000 on the Steer axle, around 22,000 on the drive axle, and around 5000 on the tag. The weight on the steer axle can be adjusted by the air pressure regulator for the tag axle in the engine compartment. I run mine at 40 psi. It seems like your tags is heavy as is your steer and your drive is lights which can mean your tag air pressure is way too high.
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Old 06-18-2011, 02:54 PM   #6
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80 psi is the minimum for your tires, so that's what you need for the tags.

Ditto for the rear duals, which are only carrying 7120 for a pair of tires - hardly any weight at all.

The fronts need max capacity or 125 psi. 120 is good for a max of 7580, only 20 lbs over what those tires are carrying (7560). Use 125 psi to get a bit of margin - 7830 capacity. I would consider changing the fronts to 315/80 next time around. That would let you run a bit softer (about 110) and get a smoother ride.

My data comes from the GY Tire Guide dated 2007.
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Old 06-18-2011, 02:57 PM   #7
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Gary, he is over GAWR on the front axle!!!!!! He cannot run like that, that is not the way the MH is designed. Something is wrong.
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Old 06-18-2011, 08:03 PM   #8
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Mike, My front gawr is a spicer rated at 15,160. I'm running 45 psi in the tag air bags.I just was concerned with such low air pressure in tag tires
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Old 06-18-2011, 08:15 PM   #9
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Mike , Lost track of where I was, the frt axle is 15,160 , rear axle is 20,000 , tag is rated at 10,000. Having read garys reply I think I'm on track. I'm going to reduce tag pressures to 40 and air the tires the way Gary stated, which is pretty much the way I interpreted the tire charts. Again thanks for everyones input. Leaving on 2,500 mile trip tomorrow, will let you know how it goes.
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Old 06-18-2011, 08:16 PM   #10
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I will not go lower than 85 lbs on my tag. But your drive axle total weight doesn't make sense because it is too lite. I find that amazing that your steer axle on the same Roadmaster chassis has a larger GAWR that my Signature steer axle which is a Spicer 14600 lb axle. The must have changed them in the four years.
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Old 06-18-2011, 08:21 PM   #11
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Mike, Mine is road master chassis with GVWR 45,160 ,and gcwr 55,160 . 08HR Imperial @44' 11". Thanks for your input
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Old 06-19-2011, 08:55 AM   #12
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The rear (drive) axle is light because the tag is carrying a lot of the weight. If Sparky reduces pressure in the tag air bags, the weight on the rear axle will increase and the tag axle will decrease even further.

295/80 tires are insufficient in load capacity for a 15,600 lb front axle. The really need to be upgraded.

But I agree that those weights seem awful light for a coach built on such a heavy duty chassis. I think I would head back to the scale for a re-weigh.

However, at 85 psi those tires will carry 5100 bs each (dual) and 5750 (single), so even if the weights are off there is plenty of capacity for both rear axle and tag.
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Old 06-19-2011, 09:18 AM   #13
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It would worry me carring that much weight on the front and that little on the drive axle. If correct that will make for perculiar handling. I run 40 psi in my tag airbags and it seems to be OK. At 28 psi (factory) my drive axle tires were too hot. Bumping the tag to 40 psi cooled them down about 18* even with the correct pressures in the tires.
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Old 06-20-2011, 07:20 AM   #14
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Gary and Mike, First leg of the trip was flawless, I can honestly say this coach has never ridden or driven as good as it does right now! I'm sure I could tweak the pressures, but for now I'm pretty satisfied with ride and handling . Thanks Gary
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