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11-10-2017, 01:13 PM
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#1
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Member
Brand: Thor Motor Coach
Model: Four Winds 23U
State: California
Posts: 51
THOR #9748
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Tire pressure - wrong
I weighed my coach and found it fully loaded with gas, water, people and stuff to weigh 11,250 lbs. I also got the weight of both axles. I also got hold of the tire pressure weight chart for my tires.
The bottom line is the door sticker covers the coach as max weight, 12,500 lbs and is not the correct amount for less.
There is also a 5 lb bump for operations at 70mph.
According to the chart I need about 52 lbs to carry the load, add some for safety and the the speed bump, 62 lbs is what is needed.
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11-10-2017, 01:45 PM
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#2
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Senior Member
Brand: Thor Motor Coach
Model: 22FE
State: Washington
Posts: 270
THOR #8606
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Quote:
Originally Posted by groundpounder
I weighed my coach and found it fully loaded with gas, water, people and stuff to weigh 11,250 lbs. I also got the weight of both axles. I also got hold of the tire pressure weight chart for my tires.
The bottom line is the door sticker covers the coach as max weight, 12,500 lbs and is not the correct amount for less.
There is also a 5 lb bump for operations at 70mph.
According to the chart I need about 52 lbs to carry the load, add some for safety and the the speed bump, 62 lbs is what is needed.
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I was running 75 all around on my coach. Finally "looked" at the chart on the door frame, lowered rear to the 65 rating and found yesterday on 70 mile run, handles much better than before. Chart said 75 front, 65 rear. I'm gonna try lowering front 10 lbs. based on your post, see what it does.
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11-10-2017, 02:08 PM
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#3
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 32A
State: Florida
Posts: 1,873
THOR #2829
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Yep.. I need to get my coach re-weighed now that our travel pattern has changed from 3 month+ snowbird trip (carry lots of stuff) to shorter durations... I was close to max - so using the max pressures on the placard.
I certainly am running at a much lower weight now - and should be able to reduce tire pressure.
__________________
Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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11-10-2017, 04:02 PM
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#4
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Member
Brand: Thor Motor Coach
Model: Four Winds 23U
State: California
Posts: 51
THOR #9748
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Now if you want to get even more techy consider the so called "cold" tire pressure is at 68 degrees. Goes up about 2% for every 10 degrees F.
https://en.wikipedia.org/wiki/Cold_inflation_pressure
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11-10-2017, 04:14 PM
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#5
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Senior Member
Brand: Redwood
Model: 36FB
State: Arizona
Posts: 1,766
THOR #3610
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Quote:
Originally Posted by groundpounder
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Then take into consideration elevation changes also. In my opinion find what you like, adjust it cold (means before being driven, 1st thing in the morning), inflate to that & enjoy your trip. You can go nuts jacking pressures up/down for this/that, the tires are designed to handle temperature, elevation changes.
__________________
Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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11-10-2017, 07:11 PM
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#6
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Senior Member
Brand: Still Looking
State: Texas
Posts: 6,187
THOR #2121
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Tables for tire air pressure as a function of load are usually the minimum pressure required, but there are other reasons engineers may specify higher pressures.
In my case 37 PSI is enough for the Michelins to carry the maximum front axle load, but Ford specifies 55 PSI. I usually run them at 50 PSI but won't go lower because it introduces too much sidewall tire flex which adversely affects handling.
Just saying minimums are just that, a minimum requirement. Going higher isn't necessarily bad or wrong.
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11-10-2017, 07:34 PM
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#7
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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__________________
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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