Tire pressure question

[jriker63]

New tires installed today. PSI label on new tires say 120 psi. Tire guys said to inflate to 100 psi, rv Manuel says 80 psi. What psi should I run. 2005 fleetwood bounder 34f. Thanks in advance!

 

[AbdRahim]

Look up the tire weight chart. Get coach weight and adjust accordingly. I run 97.100lbs.

 

[jriker63]

Look up the tire weight chart. Get coach weight and adjust accordingly. I run 97.100lbs.

Ok thank you. Also the lug nut torque is all over the place. One says 100 other says 145 and one says 450!!! What would you recommend?

 

[AbdRahim]

That I dońt know.I leave that to the tire shop.

 

[osuallen]

Look up the tire weight chart. Get coach weight and adjust accordingly. I run 97.100lbs.

97.100 - that is pretty precise

 

[osuallen]

Ok thank you. Also the lug nut torque is all over the place. One says 100 other says 145 and one says 450!!! What would you recommend?

It really depends on you coach and rim/tire size

 

[AbdRahim]

97.100 - that is pretty precise

Yup, changes with temp.

 

[Rollin Ollen]

I am looking for a little guidance. I have just purchased a Tire Monitoring System since I recently replaced the tires on the coach. I am a little concerned with what AI is suggesting for a suggested PSI. Here is the info that I hope will shed light on what I should consider.

I have a 2019 Jayco Precept 31U.

GVRW = 22,000 lbs

Front GAWR 8,000 Rear 15,000

I have Michelin 235 80R22.5 load range G Max pressure is 110 PSI

I have not had a chance to have the coach weighed yet. I am just setting the monitor system up.

Jayco recommends a max tire pressure front and rear at 90 PSI.

Since I do not have any actual weights AI recommends running the tires at Max PSI as recommended by the tire manufacturer because an underinflated tire will over heat. To further complicate matters, there are no scales in my neck of the woods that can measure the weight of each corner. Only front and rear axles. So, from what I am reading, pressures will be a "best guess" anyway for now.

I am doing my best to balance the weight side to side. I have two slides on the left (the galley which is large and the bedroom which is small) as well as the Generator. This, to me, makes it the heavy side. The right side has a small slide (dinette) and a large fridge plus two 12 volt wet cell house batteries. I have moved some tools and heavier items to the right side storage bins. Fuel, fresh and holding tanks are center rear so even side to side. Hopefully I have managed to balance the load fairly well.

On the plus side, reorganizing has allowed me to get rid of some stuff that is not important enough to keep.

So, should I go with what Jayco recommends or AI? maybe the safest bet is to split the difference and go 100 PSI. The tire company told me that they always just go with 100 PSI but I don't thrust them. I now have tires with pressures ranging all over the map from 110 and down to 85.

Looking for suggestions (or confirming my thought of 100 PSI).

 

[Holdmybeer]

You can run the tires at the maximum sidewall pressure all day long and they'll be fine. However the ride won't. Download the Michelin load inflation tables, find your specific tire, adjust the psi accordingly and it will all be good. I have a Jayco 32' on Michelins. I run around 82 on the front and 90 on the rear. I set those pressures in accordance with the Cat scale weights and the load inflation table.

 

[osuallen]

@Rollin Ollen -- It's really dependent on your weight. Is what you are calling Jayco's "max" coming from the placard probably located near your drivers seat? If so, those are the pressures for the original tires based on the GVWR capacity for each of the axles. If you are positive you are not over weight, you can use those pressures assuming your OEM tires were same size, manufacturer, and model of the OEM tires, until you can get weighed. If tires are different, use the axle capacities with the charts for your current tires - again assuming you are not over weight. If you suspect you are over weight - that is another story. Suggest you find a CAT scale and get your axle weights. Add 3-5% to each axle before you divide by 2 to account for side to side imbalance and should get you the correct weights to go to the Michelin tire chart.

 

[Rollin Ollen]

@Rollin Ollen -- It's really dependent on your weight. Is what you are calling Jayco's "max" coming from the placard probably located near your drivers seat? If so, those are the pressures for the original tires based on the GVWR capacity for each of the axles. If you are positive you are not over weight, you can use those pressures assuming your OEM tires were same size, manufacturer, and model of the OEM tires, until you can get weighed. If tires are different, use the axle capacities with the charts for your current tires - again assuming you are not over weight. If you suspect you are over weight - that is another story. Suggest you find a CAT scale and get your axle weights. Add 3-5% to each axle before you divide by 2 to account for side to side imbalance and should get you the correct weights to go to the Michelin tire chart.

Thanks for the reply. It came with Michelins and I doubt I will be over weight. Fuel will be full at the beginning of pretty much every trip. Fresh water will be about 1/3, grey and black will be empty. The liquor cabinet may be a little over weight but that's about it. I'll get weighed asap but I wanted to set up the monitor with something reasonable.
Thanks again.

 

[Rollin Ollen]

You can run the tires at the maximum sidewall pressure all day long and they'll be fine. However the ride won't. Download the Michelin load inflation tables, find your specific tire, adjust the psi accordingly and it will all be good. I have a Jayco 32' on Michelins. I run around 82 on the front and 90 on the rear. I set those pressures in accordance with the Cat scale weights and the load inflation table.

Good info. Thanks! I'll start with your recommendations until I can get her weighed but i would not be surprised if I stayed there.

 

[Boat Bum]

Until weighed I would go 90 all around, it's what mine calls for. When purchased it had 110 in all the Michelins and the ride was horrible. I read the owners manual and put them at 90 and have been happy ever since. I replaced them with Toyos and run 90 in them as well, I've never weighed my coach.