Patrick Campbell

Where do you make the distinction between the load rating of the tire and when you need to step it up to some real high load high pressure tires...

e.g.

If I took the bed off my truck it'd weigh about 2000# on the rear axle, leaving a whopping 4830# before I reach my tire ratings (3415*2). On a trailer with 25% of the weight on my rear axle, that is over 18,000# towed on regular passenger Load range E 80 PSI tires. Single rear wheel!

When do I say OK, even though that is technically within the tire limits, I *NEED* some real tires, like Load Range H 19.5" tires.

There must be other factors besides load rating, like sidewall flex?

Casey Balvert

If you are exceeding the load rating of the tires that came on the truck you are likely going to be exceeding the load rating of the axle as well. Also going up to a G rated tire at 110 psi may exceed the limits of the rims. In reality you cannot exeed any of tire rating, axle rating or GVWR. And it is the last one that will be the primary limiting factor. By the way, no way you will tow that trailer and be within the GVWR of the truck. Hope that answers your question.

Casey

upersleder

adding to, if i may, why does a tire have two load ratings? and why would a tire used in a dually application have a lesser rating? i bought tires this past week, E rated, they were like 3000 lbs and 2800 or something when used in a dually application.

and i see your point on the tire loads, but like casey said, i would have to say it would be a weakest link scenario, tires may hold, but what will be the first thing to brake? also how you gonna stop it?

59FORD

It's called HEAT

There is less air in motion around each tire to remove the heat with duals.

Patrick Campbell

Interesting - I would've never thought about that. but it's totally logical.