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Tire air presure

This is a public forum to discuss Eagle related technical issues. If you are having a problem with your Eagle, this is the place to find help.
Re: Tire air presure
Tue Jun 30, 2009 6:37 pm

Dan, What's the reasoning for the lower pressure on the bogies/tags?
Becky & Paul Lawry
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Re: Tire air presure
Tue Jun 30, 2009 6:41 pm

I believe that it caused less drag and wear on the bogie/tag tires and still gave you enough traction for braking.
Daniel Lenz
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Re: Tire air presure
Wed Jul 08, 2009 8:44 pm

I profess to be no expert but the reason I run 105 psig cold inflation on the steering position and 95 psig on the drives and bogies is what I suspect is the difference between cold and hot inflation pressure. The power is being transmitted to the pavement through the drive tires and they run hotter than the steering position. I check things out after I run awhile and I shoot the tire temperature with an infrared thermometer. The drive tires will be warmer than the others as much as 40 degrees F.
I really am looking to make sure that all of the tires are about the same temperature, that is to say that the steering position are within a degree or two of each other, the bogies are with in a degree or two of each other and the same with the drive tires.
I had a front axle alignment problem and the right front tire was 15 to 20 degrees warmer than the left front until the alignment problem got corrected.
A under/over inflation problem can be identified this way real fast also.
I'll have to pay more attention to the exact delta T between all positions now that you've got me thinking about it.

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Re: Tire air presure
Fri Jul 10, 2009 5:09 pm

Hey I like this, It was my thought that some one had changed me 1968 o5 with 12:22.5 sLOL
Now I know that some were set up with 22.5" and others with 24" now as for why ????
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Re: Tire air presure
Wed Nov 09, 2011 8:36 pm

My 73 05 haqs 24.5s and the speedo is dead on.
1973 Silver Eagle Vulcan Coach Conversion #9109
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Re: Tire air presure
Thu Nov 10, 2011 8:17 am

I have Kuhmo's all around. I run 100 on the front and 95 on rear. My techinical reason is that we have a screw compressor and the pressure is set at 120psi at the tank. The lines are set at 100psi, and I'm tooo lazy to change it!! It rides fine and I don't see any funny wear after 3ok miles.
Eric Brown
Spartanburg, SC
1973 05
Series 60 allison 4000MHP
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Re: Tire air presure
Thu Nov 10, 2011 9:03 am

A 1973 model 05 was shipped with 22.5 fwiw ,the GVW drops big time with the 11Rx 24.5 tires

good luck
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Re: Tire air presure
Thu Nov 10, 2011 2:30 pm

I have 24.5s.

I run 100 in the steer and 90 in the bogies and drive.

Tire charts give the inflation ranges according to weight. Mine say I can run 85 in the bogies and drives. I just believe 85 might get too hot in the summer.

The more air - the stiffer the ride.
Joe Laird
'78 05
Sioux Falls, SD
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