Cruisineasy
Hayward
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Joined: 08/07/2011
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way2roll wrote:Grit dog wrote:way2roll wrote:Cruisineasy wrote:I have a 2011 31' Jayco Greyhawk. I used to set the tire pressure at 80psi all around. The front always felt like it was drifting. Not much fun to drive. I lowered the front to 75psi. Made a world of difference.
Was this adjustment made on any determining facts or just from the hip? Without weighing the rig and comparing against the tire manufacturers charts, it's just a guess. Personally I find advice based on a guess is a bad idea.
Or think about it the old fashioned practical way. What % of passenger vehicles or even commercial vehicles are out there pounding the pavement every day with totally unknown tire pressures? The answer is a shat load of them. And aside from the extremes like driving on a half flat tire, how many end up on the side of the road with a low pressure blowout? Objectively, very very few. A very minuscule fraction of 1% at best.
Given that TPMS has been mandatory on all vehicles (including commercial buses) for over 20 years I doubt there are many vehicles at all where the car doesn't at least know it's own psi and issues warnings if it's too far out of a safe range. The car won't let you guess. On my wife's CRV that range is very narrow as a drop in ambient temp usually trips the low psi warning. Oddly enough and to the point, RV's are one of the few vehicles on the road that are not required to have a TPMS and thereby must be managed manually. So adjusting on the fly in a MH really is a guess and there's no system to tell you you're wrong. Unless you have an after market TPMS, And if you are diligent enough to have one of those, you probably take the time to set the psi properly.
I ride a Harley and saw a truck tire blow out and it was pretty violent. Needless to say, I don't ride next to trucks.
Not that scientific. I check the tires and the pressure every time I roll out. I lowered the front tires 2psi and drove the rig and it felt better. Dropped it another 2psi and it was great!
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pianotuna
Regina, SK, Canada
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Joined: 12/18/2004
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I run the maximum (80) on the rear. Front feels much better at 65 lb
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.
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PatJ
Eastern WA
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Joined: 05/03/2005
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My personal opinion you have two good options: 1) Weigh each corner fully loaded for a trip and inflate accordingly per the tire manufacturer's inflation tables (personally I add 5psi as was previously mentioned.) 2) Inflate to max, which is 80 psi for 16" LRE tires.
I use option 1 which lined up with the "yellow tag," then added 5 psi for my own neurosis. I use option 2 when I am towing with no ill effects. When in doubt, always go with the higher pressure. For LRE tires you can't go wrong with 80 psi all around (ride/handling may be affected, but load safety will not.) Again my opinion
Patrick
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4x4van
California
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Joined: 02/19/2010
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Obviously the best option is to weigh the coach, preferably 4 corner, but at least each axle. Then use the tire manufacturer's load tables to set your pressure. The 2nd best option is to use the Federally mandated sticker on the driver's door that specifies tire pressures needed for the chassis's max GVWR. NEVER should you simply use the max psi listed on the tire (which is likely what the young "tire tech" was going by); it has no relevance to any specific rig.
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