BarryG20
Castle Rock, Colorado
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Well I may be reading to much into it but yes I think the table applies to your tires. Why would they provide a load inflation table and have a specific set of tires listed and the load inflation table not be for them. It appears on the second chart that all the tires in that chart are for their "S" series of tires(I have no idea if Sumitomo has other lines of tires that are not part of their "S" series)
Many of the load inflation tables I have seen encompass multiple tires. I have seen them broken out by specific type tires, or under specific categories ie rv tires, or truck and bus tires before or just by size for their entire line. The Tire and Rim Association I think and I may be wrong has set standards that size and load rating and psi requirements for that are standard across all tires regardless of brand. Load range A, B, C, D, E, F, G, H in a specific size should have the same load inflation pressures. I mean what good would the rating be if a load range E tire didn't mean the same thing across different tires in the same load range and in the same size. Are there exceptions probably there seems to be in everything else but they certainly aren't going to be way different.
Remember the tables are a starting point. I would not go under the recommended inflation for a given weight but you can certainly go higher as you may find handling, wear and or performance is better on a specific vehicle at a higher pressure than stated due to specific characteristics of that vehicle. A perfect example would be the highly likely situation where an rv is not really properly balanced from one side to the other. Yes you get an axle weigh of say 7000lbs so you divide by two to get 3500lbs a tire. That works as long as the axle weight is evenly split between the two tires but it is not that uncommon for an rv to have one side heavier than the other. In which case it could be enough to increase the inflation pressure on both tires to cover the lopsided weight.
Sorry, getting longwinded bottom line is I would have no issue whatsoever in using that load inflation table for your tires based on what I read in that link.
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kahoona
North Palm Beach, FL
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Joined: 09/27/2007
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CA Traveler wrote:The inflation tables are designed (hopefully) to provide the optimal conditions for a given weight. More pressure up to the max can cause more tire rounding and less traction and center wear for example. Inflation for all tires on a axle is the same and based on the heavest side.
Tires aren't always what they should be and I remain negative on Michelin and Goodyear due to my experience with cracking and other issues.
Having apologized for not figuring out the information offered on the website I was going to shut up but you made three good points which I agree with. . As you mentioned too many psi for the load does make the tire wear in the center and also reduces traction. That is why I always (as you also suggested) find and use the manufacturers load and inflation for that tire.
I also share your mistrust of Michelin and Goodyear. I had a set of Michelin RV tires begin to crack in the sidewalls as they hit five years and had to replace them. I also had a set of Goodyear RV tires that began blowing out at around five years. I an anal about tire pressure and I also check temps with an IF thermometer at every stop. Thus the Sumitomo's.
Thanks all for the help.
Kahoona
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CapriRacer
Somewhere in the US
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Joined: 01/27/2012
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And just to be clear:
The tables are MINIMUMS, not recommendations.
Plus, inflation pressure doesn't have as much effect on wear as alignment or even position on the vehicle. In passenger cars, the steer tires wear in the shoulders and the drive tires wear in the center, at about the same rate.
That means that in passenger cars, tires on a RWD wear differently, but at the same rate, so tire rotation gets more miles out of a set.
In FWD, the steer tires and the drive tires are the same, so generally the wear is even, but more rapid than the rears. Tire rotation is so the tires wear out at the same time.
I suspect the same is true of trucks and buses, although you don't find many FWD trucks or buses.
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CapriRacer
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4x4van
California
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Joined: 02/19/2010
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As has been said, Load tables for tires are standardized and should be consistent across all brands, assuming the same size/load range. In the absence of having those tables and your actual axle weights (4-corner weights are best), you can use the Federal Tire Info label on your RV (on or near the drivers side door/position) that actually lists your max GAWRs and the pressure needed for those weights using stock size tires.
I can pretty much guarantee that the tire sidewall max is too high for your application, and should not be used. The dealer who sold you the tires should have checked that Federal Tire Info label, NOT simply gone with the max pressure listed on the tire. That's not only lazy, but could even be dangerous.
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