The Beave
Georgetown TX USA
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Joined: 08/07/2002
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Just curious, the correct tire pressure for the TOYO tires on our rig based on the tire size and weight at all 4 corners is at the extreme low end of the tire pressure chart for both front and rear.
The recommended pressure for our 255/70/22.5 tires is only 75 lb front and 85 lb rear, although I add an extra 5 lb as a safety margin. This is WAY under the max inflation pressure on the tire sidewall.
Question. Will such a tire have a longer life than a tire running at its max pressure?
The Beave
30' 1997 Beaver Monterey
(The shortest DP we could find)
2005 Honda CR-V
Remco surge brake
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jauguston
Bellingham, WA
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Virtually all Class A motorhome tires age out way before they wear out.
2005 Coachman Sportscoach Elite 402 40'
350hp Cat C-7 w/MP-8
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DanTheRVMan
fl
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Joined: 10/15/2011
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jauguston wrote:Virtually all Class A motorhome tires age out way before they wear out.
"Age out" is an unknown even if estimates are 5, 7 or 10 years
It is based on temperature, uv, usage, tire pressure, etc.
It is a reasonable question even if there are no simple answers.
Dan
Allegro Red 36ft
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1995brave
San Antonio, TX
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Quick answer, YES.
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Chuck&Gail
In the Colorado Mountains
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I know it isn't a MH, but I've ALWAYS run our TT tires based on weight, then added 5 psi to table numbers for luck. No problems so far except repairable punctures in over 200,000 miles.
On our CARGO trailer I need to replace the tires soon as they are 7 years old (my time limit setting). I run those ST205/75R15's, rated at 1820# at 50 psi, or 3640# for the pair (single axle), at 20 psi. Worked great for 7 years. Trailer GVWR is 2990#. Fully loaded we weigh in at just under 1600#.
Yes I know we should use less pressure per the tables, LOL.
Chuck
Wonderful Wife
Australian Shepherd
2010 Ford Expedition TV
2010 Outback 230RS Toybox, 5390# UVW, 6800# Loaded
Not yet camped in Hawaii, 2 Canada Provinces, & 2 Territories
I can't be lost because I don't care where this lovely road is going
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othertonka
Stockton, CA
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I beleive that if you weighed your RV at all 4 corners and the inflation chart for those tires show that 75 lbs will carry the weight on the front and 85 lbs will carry the weight on the rear, then the only thing you get by inflating to a higher PSI would be a harsher ride and maybe a looser steering feel. As stated above, they will probablly have to be replaced due to age long before the tread wears down, so enjoy the proper pressure and a resulting better ride then if you just inflated them to maximum pressure. Just my opinion and offered as such. I have weighed my RV and use the inflation chart for my tires and the actual weight they carry.
Othertonka
2004 Southwind 32VS 8.1 Workhorse chassis
2002 CRV Toad
U. S. Gear Unified brake system
Retired Fire Captain, SFD
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UltraKen
Ohio
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The Beave wrote:Just curious, the correct tire pressure for the TOYO tires on our rig based on the tire size and weight at all 4 corners is at the extreme low end of the tire pressure chart for both front and rear.
The recommended pressure for our 255/70/22.5 tires is only 75 lb front and 85 lb rear, although I add an extra 5 lb as a safety margin. This is WAY under the max inflation pressure on the tire sidewall.
Question. Will such a tire have a longer life than a tire running at its max pressure?
The Maximum pressure stamped on the tire is for MAXIMUM LOAD. The pressures from the tables are for the load your coach is carrying on the tires. That's the pressure to use.
Many people add 5 to 10 lbs over the table value to give a little leeway for air loss or temperature changes.
UltraKen
Ex - 1968 Ultra Van
NOW - 1996 Safari Sahara 35' - Model 3530 - Cat 300
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My take on replacing tires
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Deetour
Washington
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Joined: 06/01/2011
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UltraKen wrote:Many people add 5 to 10 lbs over the table value to give a little leeway for air loss or temperature changes. I never did understand this.
Isn't it just as likely that your gauge reads 5 to 10 lbs high.
Isn't it just as likely that tire mfgs account for temp changes in their charts.
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Old-Biscuit
Across the USA
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Joined: 06/20/2009
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If tires are wearing evenly across the width of tread then you are going to get the most out of the tire....whatever that may be.
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rgatijnet1
Florida
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Old-Biscuit wrote:If tires are wearing evenly across the width of tread then you are going to get the most out of the tire....whatever that may be.
That is exactly right. Tires that are run with too high or too low pressure will show signs of uneven wear. I will probably wear my tires out(to the point I will replace them) before they age out. I have a little over 30,000 miles now in 20 months and I have worn down 3/32 from the 15/32 of new tread depth. At 60,000 miles, I will change them out, no matter how much tread is left. I will keep one for my spare. The tread wear is easy to check and measure. It is also easy to see if you have alignment problems or balance problems, both of which will affect tread wear. I run approximately 5 PSI over both front and rear tires which puts them at the maximum load carrying pressure for my tires.
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