Load Range H Steer Tires

Your atlas will list every states steer axle rules, some have straight weight, some go by inches of tire. I.e. 660 lbs/inch, 11R's are (obviously) 11 inches wide, X 2 = 22 = 14520 lbs.

 

I only put 11R 24.5's on the steer axle, still have the LP 24.5's on the drives, since I pull a 13'6" van, and didn't want to have to mess with ride height, and I am never heavy on the drives like I was with the steer axle. I have 3.58 rears.

 

I'm running 3.58 drives also, I like the power but the rpms too high at 70mph with 22.5's. What's your revs at with those 24.5 lo-pros at 70? I appreciate the info, still trying to decide how long it'll take me to swap to tall rubber.

Good call on the 11R steers, wasn't sure you could mix and match the steer tires and the drives. I'm still trying to learn what's a no-go with the ABS and all the fanciness on the "new" truck (new to me). If I could take a few steps back, I would buy my drives in 11R's - but too late now! With the hopper trailer, the only thing I have to worry about is the sleeper clearing - the trailer is only about 10' tall.

Thanks for the tips - good to know I'm not the only Volvo/ISX out there - I like my truck and I hope she runs forever.

 

HP, If you want to figure your rpm's google an rpm calculator. plug in final drive ratio for the trans (your's is .73) , gear ratio, tire height and speed.

Exact height will vary from manufacturer but you can use these numbers to play with.
22.5LP---41"
22.5x11--42.5"
24.5LP---42.5"
24.5x11--44"

with 3.55 gears I calculated 98rpm difference from LP22 to 24 talls.

 

I'm right about 1500 rpm at 70 mph.

 

Anyone ran the BF Goodrich ST 230? Some sizes are load range H, someone mentioned them the other day elsewhere just curious if they are worth the money?

 

Have the caster and camber checked...If the truck is pulling one way or another (usually to the right) and cupping tires, That is the problem.

Mine was doing the same thing in the first year after I got it and it was the caster and camber...It was way off.

 

Almost all states will allow 12,500 lbs on steer axle if you run "H" rated tires but absolutely no more.
Additionally 80,000lbs is the max allowed in all states regardless of tire rating so if you are running
12,500 lbs on your steer you better be running light on 1 or both of your drivers.

 

Let's see some regulations that back up your claim. I have a 13,300 steer axle with H rated tires. I've had them come out and check my tires and wave me on. Been well over 12,500 in many states and never had any trouble.