Search Tires
Q/A Archives
October 2009
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| « Sep | Nov » | |||||
| 1 | 2 | 3 | 4 | |||
| 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 19 | 20 | 21 | 22 | 23 | 24 | 25 |
| 26 | 27 | 28 | 29 | 30 | 31 | |
Related Experts
Sign-up for RSS
Archive for October 26th, 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.