Similar tires---vast differences in tire pressure

Messages
1,677
Location
Southwest
Shopping for new tires for truck. Why the vast difference in tire pressure between brands? Kumhos are 51 pounds OEM Hankooks are 35 pounds. Neither very off-roadish. Why the big difference? Sidewall or something?
 
Messages
4,597
Location
Manchester, England
Tyre pressure recommendations from the assume certain driving styles, loadings etc. they don't know which vehicle the tyre will be used with so can only guess. Use whatever pressure you like but be sure to keep notes on driving 'feel' and keep an eye on tread wear to establish a suitable final pressure.
 
Messages
53
Location
AB, CA
Originally Posted By: Johnny2Bad
Same load range? True truck tire or car tire (P-designation, eg P235-16)?
+1. Are you comparing LT Kumho Road Venture AT51 vs P rating DynaPro AT-M?
 
Messages
7,412
Location
North Carolina
There is no pressure difference between brands. The psi listed on the sidewall is irrelevant. Run what your door jamb says, not the tire. Make sure the tire you buy is the correct load range for your vehicle.
 
Messages
10,060
Location
Central Washington
The maximum pressure on the side is just that, the maximum. Either way, if both are P-metric tires the maximum load rating is at 35psi, unless its an extra load tire, then it will be at 41psi. The extra pressure above the maximum load can be used to compensate for high speed and/or high temperature.
 
Messages
7,134
Location
North America
Originally Posted By: rooflessVW
There is no pressure difference between brands. The psi listed on the sidewall is irrelevant. Run what your door jamb says, not the tire. Make sure the tire you buy is the correct load range for your vehicle.
Mmmmm sorry there is a LOT of relevance to the psi listed on the sidewall. If you put a max 35psi tire on a vehicle calling for 50psi, for example. FYI many truck owner's manuals have different pressures depending on estimated or actual load, which may differ from the door placard. From experience, I can say that the 30(IIRC)psi recommended for my 2004 Jeep Grand Cherokee left the outer edges VERY worn compared to the center, and that at 40psi I got nice even wear. Yes, the ride firmed up also.
 
Messages
4,597
Location
Manchester, England
Airing down for more footprint on snow? Airing up for better resistance to hydro planing? Or upping the rears and downing the fronts (or vice versa) foe handling? We need more info
 
Messages
1,047
Location
Indiana (IN)
Can't really say since you didn't give enough information about the tires being compared. In truck tires a load range B tire would normally have MAX inflation of 35psi, a load range C would be about 50 psi. For P metric passenger tires you could have one that is a SL (standard load) and one that is an XL (xtra load) even in the same "load range" Tire Specs Explained: Maximum Load https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=195 Tire Specs Explained: Maximum Inflation Pressure https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=196
 
Messages
7,134
Location
North America
Originally Posted By: CapriRacer
Read this (and pay attention to the *Notes on page 1-34*): Barry's Tire Tech - Load Tables Any questions?
Thanks for the reference....so a heavier vehicle will need a higher pressure than a lighter vehicle with the same tire. A heavily loaded vehicle will need higher tire pressure to support the load than the same vehicle completely unloaded. Your reference said it much better than I did.
 
Messages
3,829
Location
Somewhere in the US
Originally Posted By: Kuato
Originally Posted By: CapriRacer
Read this (and pay attention to the *Notes on page 1-34*): Barry's Tire Tech - Load Tables Any questions?
Thanks for the reference....so a heavier vehicle will need a higher pressure than a lighter vehicle with the same tire. A heavily loaded vehicle will need higher tire pressure to support the load than the same vehicle completely unloaded. Your reference said it much better than I did.
The important point - relative to the original question - is that the selection of the maximum pressure by the tire manufacturer for a passenger car tire is arbitrary and no implication should be made of it.
 
Top