Geeky question about front axles & weight

I have a 4 axel 379 double frame.
I have a 16 k steer axel
Alot of states will still only allow 12k on the steer with 315-80's x 22.5
I have been told that if I move up to a larger tire and rim some states in the west will allow more than 12k

 

If you are looking for axle weight limits for heavy haul or permit loads the best thing I can tell ya is to buy the oversize load book at the truckstops. It has a lot of the info you might be looking for, like axle spacing and weight ratings for each state, max GVWR for each state, and many others. As for normal wieghts its 12,000 steer, 34,000 drives, and 34,000 trailer (unless you have a spread axle over I think it is 10' then you are allowed 40,000) but your gross weight can not be over 80,000. Some states do allow high steer axle weights, but the vehicle needs to be equipped with the higher rated steer axle and tires. All the states are usually different (or at least prettly close) when it comes to the weight/axle regs.

 

really all depends on the state..

Here in MI, log trucks, and dump trucks run 445/65's on the front, and can be 18K.
heavy haul tractors usualy run 385's up front, can be 16K on the steers