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[Too many Kubotas]

Anything heavy can be a biotch in sand, and much more so with duals.

My light Jeep with oversize tires at 1 psi on the other hand...

 

[Renze]

My light Jeep with oversize tires at 1 psi on the other hand...

You better have beadlocks then, or risk spinning the rim in the tire.
10 psi is the lowest i went with tractor pull. Tires on the rims for a decade so they dont slide easy.

And does the middle of the tire still touch the ground or is it running on the sidewall stiffness, instead of air ?

 

[WinterDeere]

Anything heavy can be a biotch in sand, and much more so with duals.

My light Jeep with oversize tires at 1 psi on the other hand...

I don't get it. Duals suck in snow, but for the opposite reason. In sand, you want minimal PSI at the contact area, which is exactly what duals would give you. How could they be worse?

Snow, you want the opposite, maximum PSI so they cut thru and grip the ground beneath. This is why tall skinny tires usually perform best in snow, and duallys are a nightmare.

 

[bcp]

In sand, it isn't so much the duals themselves, but the HEAVY truck they are attached to.

Bruce

 

[Too many Kubotas]

You better have beadlocks then, or risk spinning the rim in the tire.
10 psi is the lowest i went with tractor pull. Tires on the rims for a decade so they dont slide easy.

And does the middle of the tire still touch the ground or is it running on the sidewall stiffness, instead of air ?

No, never did care for beadlock wheels. And yes, the tires would turn on the wheels. Especially the right rear.

At first I repositioned them on the wheel, but then realized that it was much quicker to just swap them side to side and letting them go back to (and a bit past) where they should be.

The tires were marked relative to the valve stems so it was easy to see where they should be.

That was with bias ply tires, usually slightly tuned with a grooving iron for even better conformability, so a rather large contact patch was the result.

 

[Too many Kubotas]

I don't get it. Duals suck in snow, but for the opposite reason. In sand, you want minimal PSI at the contact area, which is exactly what duals would give you. How could they be worse?

Not that I fully understand how it really works, but let's say that you have a pair of duals with 5" wide tread each.

In theory that should equal a single 10" wide tire, but it doesn't. Far from it.

Learned that lesson very quickly the first time hitting the beach with a dually, with the same camper and flat towing the same Jeep as I had been with an otherwise basically identical single wheel GM crew cab.

Yes, now the skinny fronts worked against me, but it was sketchy even in 4WD. The SRW was a 2WD with oversized tires and really didn't give me any problems.

 

[BigBlue1]

I've heard that called out before in off-road discussions that duals make things worse in sand. I don't know the 'why' of it, but it appears to be the case.

 

[WinterDeere]

Yes, now the skinny fronts worked against me, but it was sketchy even in 4WD.

I was thinking this, while posting that prior comment, and it has to be the only valid answer. You want minimal PSI when on sand, your finding lower tire pressure helps is the very proof of that, and duals increase that potential lower range even more than singles, when on sand or snow. It has to be the fact that you've got floating duals in rear, while skinnies digging in up front, that is the confounding factor.

 

[bcp]

Back in the 60's in the Army, there were two versions of 6x6 truck chassis. IIRC, one had dual 9x20 tires and the other had single 11x20 tires. I was told the singles were for better off-road performance.

Bruce

 

[BigBlue1]

I was thinking this, while posting that prior comment, and it has to be the only valid answer. You want minimal PSI when on sand, your finding lower tire pressure helps is the very proof of that, and duals increase that potential lower range even more than singles, when on sand or snow. It has to be the fact that you've got floating duals in rear, while skinnies digging in up front, that is the confounding factor.

From discussions I've heard about it I don't think that's it at all. For some reason duals tend to dig themselves in faster in sand. I'm no expert and all I have to share is hearsay from folks who are 'experts', such as on Matt's Off Road Recovery who operate in those conditions all the time. But what I've heard from those folks contradicts this idea.