Figuring the correct tire pressure
Recently had our coach weighed. We are at 6,700 lbs (3350 per tire) front and 12,180 lbs (3350 per tire) rear when fully loaded. Tires are Goodyear G670. Using the tire pressure chart from Goodyear it...
Forum Discussion
Go with the what Goodyear recommends but also add a few PSI to compensate for potential increases in loading or temperature changes.
The coach chart is based on the listed size and load class of the tires that were installed by the chassis builder. If the tires you have now does not match what is listed the chart numbers should not be used.
If you cross reference the chart numbers you'll find the pressure listed for the tire listed will be slightly over the axle maximum capacity. In other words the chart is the pressure for the tires listed if you load the coach to the axle maximum. If your current weight is less than chassis maximum that would be the reason why the pressures don't match and why your ride is rather harsh.
Also if you're off the bottom of the chart, as I am, don't try and extrapolate what the pressure could be. Best to stay at or above the minimum pressure listed on the OEM chart.
The coach chart is based on the listed size and load class of the tires that were installed by the chassis builder. If the tires you have now does not match what is listed the chart numbers should not be used.
If you cross reference the chart numbers you'll find the pressure listed for the tire listed will be slightly over the axle maximum capacity. In other words the chart is the pressure for the tires listed if you load the coach to the axle maximum. If your current weight is less than chassis maximum that would be the reason why the pressures don't match and why your ride is rather harsh.
Also if you're off the bottom of the chart, as I am, don't try and extrapolate what the pressure could be. Best to stay at or above the minimum pressure listed on the OEM chart.
