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Archive for October, 2009
Rotation
Posted by Rand from Springfield, OH, US on October 26, 2009
We put your tires on Fire Trucks. We have been quizzed about rotation. Any recommendations reguarding swapping fronts side to side or duals between each other or sided to side? Thanks
Sample tires:
FRONT 315/80 r 22.5 G291
REAR 12R22.5 LRH G124
Thanks
It is a good idea to rotate tires around the truck to even out wear. Obviously, in your case, the steer axle tires can be switched left to right. For the drive axle tires, switching side to side AND from axle to axle is fine as long as the tires are within 1/4 inch in diameter.
Tire pressure 1
Posted by Bill from Atlanta, GA, US on October 26, 2009
EPA says that 1 PSI loss is equal to .3% reduction in MPG. Good year charts show that 1 PSI loss for commercial truck tires is equal to .1% loss in MPG. Assuming the EPA rating is for Passenger cars, What is the difference between this and commercial truck tires? As an example for the following Goodyear tires;
G947 RSS - LT235/85R16
G647 RSS - 225/70R19.5
G149 RSA - 9R22.5
If your question is why the difference I would say it is a matter of the recommended inflation pressure for passenger tires vs the commercial tires you give as examples. A typical passenger tires would have an inflation pressure around 30 psi. The tires you mention are 80 psi up to 110 psi. As a percent of the recommended pressure, 1 psi for a passenger tire is about the same as 3 psi for a commercial truck tire.
goodyear 338
Posted by Richard from Shelbyville, TN, US on October 23, 2009
My goodyear man say the company does not recomend using the 338 on a dual axle tractor but does not know why. I would like to know why.
The G338 1AD is intended for a single drive axle tractor. It is an agressive tread pattern and would wear faster than a tire designed for a tandem drive axle tractor, like our G372A LHD.
Rotating Tires
Posted by John from La Grange, TX, US on October 16, 2009
Can/should any of the tractor tires be rotated ?
If you are asking about a tandem axle tractor and you wish to event out the tire wear between the two axles, I suggest you determine what you consider to be about 1/4 of the total tread life of the tires and move tires from the forward axle to the rearward axle (and visa versa) at that stage of wear. I would also be good to reverse the direction of rotation (left side tires on the right and visa versa). Then, rotate when half worn and 3/4 worn.
Commercial Tire Life
Posted by Tim from Cisco, TX, US on October 15, 2009
What is the recommened tire replacement period for commercial tires used in the oil field operations?
Typically, our trucks are low miles however, exposed to the off road and weather elements.
Tires should be replaced when the tread is worn out, there is damage to the tread or sidewall that may result in a tire failure or if the tire is weathered to the point that it could fail. Only a tire expert could determine the second two conditions. Have a reputable local tire dealer inspect your tires and determine when/if they need to be replaced. Using time of usage or mileage is just too difficult to predict.