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Old 08-31-2012, 06:15 AM   #1
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Tire pressure verification

Almost ready for our maiden voyage on our new (to us) 2003 Tioga 23e. The dealer put a new set of tires (225/75R16) on it but I've never heard of the brand (Americus) and can't find a web site for them. I had the vehicle weighed at Flying J and the numbers are 3580 front 7560 rear (2002 E450 chassis). The michelin tire chart (I checked another mfr's chart and it was identical) suggests 45 psi front and 60 psi rear. Does this make sense? Won't they run hotter with more contact area at lower pressure? Of course I assume the increased contact area also provides better stability (less wandering). I guess the tread will also wear out faster but that isn't really a concern. They are at 65 front and 80 rear now.
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Old 08-31-2012, 07:27 AM   #2
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the charts are a guide. Michelin suggests 80psi for mine. I run them higher because of the load I carry. Adding 5-10psi wont hurt anything other than the ride quality.
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Old 10-14-2012, 07:36 PM   #3
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Originally Posted by WeatherTodd
the charts are a guide. Michelin suggests 80psi for mine. I run them higher because of the load I carry. Adding 5-10psi wont hurt anything other than the ride quality.
The link below is from the Michelin website. The link provides Michelin's table for tire pressures based on weight and specific tire by size. Hope this helps..


http://www.michelinrvtires.com/miche...ion-tables.jsp
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Old 10-14-2012, 07:57 PM   #4
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Originally Posted by emcee View Post
Almost ready for our maiden voyage on our new (to us) 2003 Tioga 23e. The dealer put a new set of tires (225/75R16) on it but I've never heard of the brand (Americus) and can't find a web site for them. I had the vehicle weighed at Flying J and the numbers are 3580 front 7560 rear (2002 E450 chassis). The michelin tire chart (I checked another mfr's chart and it was identical) suggests 45 psi front and 60 psi rear. Does this make sense? Won't they run hotter with more contact area at lower pressure? Of course I assume the increased contact area also provides better stability (less wandering). I guess the tread will also wear out faster but that isn't really a concern. They are at 65 front and 80 rear now.
The suggested PSI is to help keep the proper contact patch, as well as other things, and is absolutely NOT just a guide. Whil you can go 5-10psi higher, you cannot go lower. And, you cannot go 20-40psi higher either as you have now ruined the contact patch area (made it much smaller) and thus your traction.
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Old 10-14-2012, 08:02 PM   #5
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The best thing to do is drive it up to operating temp, draw a paint or chalk line across the tire tread. Then drive a few revs until the line just starts to wear.
Wearing in the center is too much air.
Wearing on the sides is too little.
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Old 10-14-2012, 08:07 PM   #6
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Originally Posted by Midniteoyl View Post
The suggested PSI is to help keep the proper contact patch, as well as other things, and is absolutely NOT just a guide. Whil you can go 5-10psi higher, you cannot go lower. And, you cannot go 20-40psi higher either as you have now ruined the contact patch area (made it much smaller) and thus your traction.
I agree with Jim, good advise here.
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Old 10-15-2012, 01:03 PM   #7
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The tire pressure charts, are, as said a guide, if you want to run say 5 PSI or 10 Percent high, Go ahead.

The proper pressure casn be determined by chalking the tires, and driving a short distance, then look at the chalk, if it's worn off in the center, but not at the edges, too much pressure

Worn off on the sides (Edges) but not in the center, too LOW pressure

Euqally worn across the width of the tire, Ideal pressure.

The ideal pressure is the highest prssurem where the full tread makes contact with the road. Less tread in contact means less control, Not a good thing.
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