Michelin Load & Inflation Tables

[davidbrady]

Has anyone else noticed that Michelin has changed their Load and Inflation Table numbers for the 315/80R22.5 LRL XZA1 and XZA2 Energy's? For example, if you need a 15220 lb load capability in 2009 you'd have to run 110 psi in your steer tire, whereas in 2013 you'd only have to run 104 psi.

The fact that the 2013 curve is linear makes interpolating easy. The formula for the steer axle is: PSI = (Axle Weight - 2740)/120.
I'm at 14227 lbs on my steer, so doing the math puts me at (14227-2740)/120 = 95.7 psi. Which is great for me because I find that if the hot tire stays below 105 psi, the ride is MMMmmm Smooth!

I run 95 psi on the steers and 85 on the drive and tags.

Here's the table from 2009:


Here's the table from 2013:


Here I graphed the two for you: