Cmore12 wrote:
After reading here, I went to the Tiffin forum. There is a 3-page EXTENSIVE post/responses set on this. Here's a "short?" bullet point summary:
1. 4-corner weighing is the best info. Done at rallies, etc. Must be level.
2. Weighing left side/right side & do the math at a CAT scale is NOT OK.
3. If just weighing axles, add 5% weight, then consult the manufacturer's chart and add 5 psi. This is conservative enough to make up for unbalanced sides.
4. Each axle MUST have same pressure side to side. Use heaviest.
5. This changes my numbers to 81 psi front & 86 psi rear. That's 25+ BELOW what the dealer put in.
6. Over pressure a bit is OK.
7. Under pressure is dangerous.
Smarter folks than me have beat this to death, but this is in line with the consensus of posts here.
Cheers,
Me, my Honey, & two dogs cuter than yours
ezgoin wrote:
The Yellow capacities sticker in my 31' MH lists cold Max PSI at 85 lbs. for all tires, but the Ford chasis sticker lists max PSI at 82 lbs., at the same load capacities. I know it's not much difference, but I was considering lowering the PSI slightly as I'm a little under max GVWR. Which numbers should I use? Any suggestions?
Thanks for all your help.
Executive wrote:
There should be a sticky that doesn't allow one to ask these questions until their rig is weighed...I cannot believe how many people do not know the weights of their equipment.
PSI is based on axle weights...period...with a small buffer if you wish. It's a fact that almost ALL blowouts are the result of underinflation of the tires. All tire manufacturers advise to use their tire inflation tables NOT what's printed on the sidewall.....it's certainly not rocket science....weigh your rig, consult the inflation tables, air up the tires and enjoy the trip.....:).....Dennis
wa8yxm wrote:So it's fords fault that people dont check there tires. I dont agree thats your job if you drive it
FORD likes to run tires low so as to give a softer ride, Never mind that this leads to sidewall failure (Remember the Ford Roll-a-matic,er, explorer fiasco that Ford blamed Firestone for... Well it was FORD's fault). so I'd go with the tire maker's suggestions.
And second, Get the thing weighed, 4 corner weights (Instructions for that all over every forum) and inflate to the tire maker's chart, optionally plus 5 PSI, This is the proper inflation for maximum tire life and control.. Inflating to the max is almost never the proper pressure.
The ford roll-a-matic.
Ford said to run 'em 5 PSI low.. So people did, and since a NEW TIRE does not leak (much) They never checked them,, The technician at the last oil change was in a hurry so he did not either, Thus instead of being 5 PSI low, they are closer to 5 PSI.
Now driving down the road they hit one of our nations' most popular freeway features (Voice of doom mode on) THE POT HOLE (Voice of doom mode cancel) and when they hit the far edge, what happened,,, The rim slided that sidewall like it was hot butter Cause there was no pressure to protect it.
So what did Mr. Yuppie who has never driven a truck in his life do? Stand on the brakes with both feet of course.. Whats #1 on the list of thigns to NEVER do when you get a flat tire.. You guessed it, Stand on the brakes with both feet.
What's #2..... Roll over and die.
Cmore12 wrote:
The local dealer says they always set the max listed on the sidewall (110psi). I weighed & consulted the Michelin chart. 71psi front & 76 rear. That's a HUGE difference. It's time to check a different reliable source.
