Planning class 4/5 rig. Am I nuts to use LT tires (dually) ?

[klahanie]

What do y'all figure ? Even if the tire load index covers the weight would LTs be just wrong ?

 

[rruff]

Sounds good to me! I would expect a sway problem since you should be well under the weight rating of the tires.

You can fit 12.5s as well, I assume?

 

[LikeABoss]

I briefly had a 4500 on those 37x11.5 nittos. Worked great with my camper setup at about 16k. I had stazworks wheels. 98” wide in the rear.

 

[HMT]

It’s a shame these tires aren’t available in a 20” wheel.

Super Single — Founders MT Radial

www.foundersmtradial.com

 

[rruff]

Say a 295/70R19.5 (40").

Those are < 36".

If you are worried about fuel consumption, stick with your original idea of LT... and get tires with low rolling resistance. Size has nothing to do with it.

 

[rruff]

So, if I put on a tall pizza cutter with a long haul highway tread I shouldn't see much of a mileage hit.

I expect a heavy duty tire with high psi and load, and low speed rating, to have high rolling resistance and high fuel consumption. That's why I thought the LT would be better, not worse! The commercial tires are made to haul a lot more weight than you need... that's the issue. Maybe that is something you can find data on... ?

Contrary to popular belief, larger tires with the same construction and compounds tend to have lower, not higher Crr. Larger diameter, greater width, lower profile are good for Crr. Hysteresis is the problem; how much internal friction is generated as the casing distorts and springs back. Speed ratings are temperature limited so that can give you an indication.