Tire Pressure Help - Printable Version

Tire Pressure Help - Printable Version

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+--- Thread: Tire Pressure Help (/showthread.php?tid=4634)

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Tire Pressure Help - jdkskyking - 12-01-2018

Hello,

I’ve never had a coach with a tag so I would appreciate some guidance on weighing it.

No individual scales available in my area so I would use a CatScale.

I’m unsure how to position it on the scale and what configuration the tag should be in.

I’ve attached a CatScale weight I took after topping off the fuel tank and probably 1/2 tank water & 1/2 tank holding. Driver only...

Steer 16520
Drive 32580
Trailer 3000
I’m sure I had tag switch in the center position.

Obviously I’m trying to get a full understanding of what tire pressures I should use.
Using the Michelin charts, based on this info, I’m coming up with:

Fronts - 100 psi for the 365s 16520/8260 (100 psi single 8780)

Rears - 125 psi for each of the 315s (125 psi single 8690 or dual 15820) or (130 psi dual 16540)

If I’m reading this correctly I need to run the rears at 130...???

Slightly confused....

Thanks, JK

RE: Tire Pressure Help - Fulltiming - 12-01-2018

Were you towing a car at the time of the weight?

If the weight is really the front, drive and tag you have WAY too much weight on the drive axle and WAY too little weight on the tag. Your tag axle should have around 10,000 pounds on it which would greatly reduce the weight on your drive axle.

RE: Tire Pressure Help - kyleb - 12-01-2018

The more weight you add to the tag, the more the front has to carry.

My biggest fear is a steer tire blowout, so I try to make sure my steer axle isn't overloaded.

RE: Tire Pressure Help - rheavn - 12-02-2018

"No individual scales available in my area"

FYI-Newell has individual wheel scales.

RE: Tire Pressure Help - Richard - 12-02-2018

The truck stop scales can be tricky. You have to find out which of the dividing lines on the platform dtermines drive from trailer. That line has to be between the drive and tag.

RE: Tire Pressure Help - Chester Stone - 12-02-2018

Looks to me like his drive weight included the tag and the 3000 figure was a trailer. In my 2001 I carried 110 all around.

RE: Tire Pressure Help - bikestuff - 12-02-2018

Kristi & Jeff,

I am thinking that you are running the steer axle a little low. I run at 110-115 on my 365s. Even though the chart says 100....what if you develop a slow leak. You could drop into the danger zone pretty quickly. While I am not worried about blow out on any of the other tires....I am very concerned about the steer axle. So...I run a little more pressure than necessary (and therefore a little harsher ride) but I have more peace of mind.

For what its worth.

Bill

Ps. I agree with Chester’s thought. Mostly because your total weight looks reasonable.

RE: Tire Pressure Help - jdkskyking - 12-03-2018

I will re-weigh the coach today paying close attention to positioning the coach on the different platforms.

At trip to Newell (1:45 mins away) will be on the list.

(12-03-2018, 06:32 AM)jdkskyking Wrote: I will re-weigh the coach today paying close attention to positioning the coach on the different platforms.

At trip to Newell (1:45 mins away) will be on the list.

I’m also adding a TPMS from my Winnebago.

(12-01-2018, 10:24 AM)Fulltiming Wrote: Were you towing a car at the time of the weight?

If the weight is really the front, drive and tag you have WAY too much weight on the drive axle and WAY too little weight on the tag. Your tag axle should have around 10,000 pounds on it which would greatly reduce the weight on your drive axle.

I must not have had the coach on the scales properly.

RE: Tire Pressure Help - jdkskyking - 05-06-2019

Newell gave me weighing numbers for 744 with full fuel and water.

Steer 8470/8390 = 16,860

Drive 11,440/11,350 = 22,790

Tag. 7440/7200 = 14,640

Total 54,290

Tire pressures from Michelin:

Steer 100psi

Drive 85psi ??

Tag 110psi

Am I reading the chart correctly for the 315/80R 22.5 Dual ? 85psi for 11,680lbs.

RE: Tire Pressure Help - jdkskyking - 05-06-2019

I’ve got the following:
Steers @ 115psi
Drive/Tag @ 110psi