Jackie Treehorn wrote:
Winnebago suggests 70 psi for my front tires and 75 psi for the dual tires in the rear. The tire company has the fronts rated at 110 and the rears at 90. Which is the right way to air the rig up?
The 70/75 from Winnebago is based on the originally installed tires and with your rig weighing the maximum amount that the axles are rated for.
The 110/90 is the maximum you should inflate the tire to. On the tire sidewall it will tell you that the tire will hold xxxx pounds at this pressure.
You would be perfectly safe at either of these inflation points, but your ride would probably be a bit harsh, especially using the tire sidewall pressures.
Instead go to the tire manufacturers web site and search for an inflation chart. Some of them only put this into the brochure for the tire, so you may have download that. A Google search will sometimes be faster than digging around the web site.
The chart from the tire manufacturer will tell you what the inflation pressure should be for a given weight on a tire. So, you have to get at least axle weights, like you would get at a truckstop, or better yet, corner weights. If you use axle weights, then divide that number by 2 to get the weight for a particular tire.
If your weight per tire is way down at the bottom of the chart, use the lowest inflation that they list to avoid going too low.
