Tire Recommendation?

[Geronimo John]

On 6/22/2024 at 5:10 PM, MAX Burner said:

FYI, after upgrading to the Alcan 5-spring leafs, new shocks, and D52 axles, we increased our tire pressure from 40PSI to 45cold -

Why?

[jd1923]

3 hours ago, Geronimo John said:

Why?

I run 45 PSI highway and when boondocking on local washboard roads I reduce to 38 PSI. I was just testing our new suspension over speed bumps at 45 PSI and I could see the tires nicely compress while taking in the speed bump. 40 PSI is enough however since we are certainly running less than 7K LBS GTW.

Some have written they will lower the tire PSI because of the stiffer springs. PSI should be determined on trailer weight. This upgrade has likely added about 150 LBS in heavier parts. Running D52 axles and Alcan springs going a little over the 7K GTWR should not be a big deal. With axles, springs, wheels and tires that can handle over 10K LBS, only the Oliver frame is the limiting factor. We know a member with multiple upgrades, upgraded suspension with disc brakes, my guess is he is well over 8K LBS actual GTW.

45 PSI is a good MAX number for most. I do not believe in adding PSI as a buffer allowing notification time using a TPMS. The PSI should be adjusted for actual GTW only. On the Michelin Agilis 40 PSI gives you 7,180 LBS and 45 allows up to 7,800. 50 PSI allows for 8,360 LBS GTW. Do you need more pressure?

Edited 20 hours ago by jd1923