Heavy Duty Trucking

DEC 2014

The Fleet Business Authority

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76 HDT • DECEMBER 2014 www.truckinginfo.com ago, but it's not enough anymore," Decker says. "In most cases today a 22.5-inch low-profile, load-range G tire will get you to only 11,600 pounds at 100 psi. A tall '22-G' will give you about 11,900 pounds of load carrying capacity. That's still not enough." According to various manufac- turers' load and inflation tables, a inflate their tires to 100 psi? Curtis Decker, manager of product development at Continental Tire North America, says the num- ber has been around a long time, and its origins befit tires that were in service 20 years ago. "The truth is inflating tires on 12,000-pound steer axle to 100 psi may have been okay 20 years Jim Park • Equipment Editor M ost fleet maintenance managers know exactly why they spec a certain drive-axle ratio. That number is one part of a series of inputs that will get them to a cer- tain engine speed at a certain cruise speed with an eye toward maximiz- ing fuel economy. But can they tell you why they If you are not running at least 105 psi in your steer tires, you're running underinflated. In some cases, those tires may be in run-flat condition. Are you putting enough air in your steer tires? Tires&Wheels Steer tires run at or close to their maximum load all the time, even when the truck is empty. Normal loads demand more than 100 psi. PHOTO: JIM PARK

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