I had my truck at the car show at the tire plant in Lexington, SC in October. I took a picture of this earth mover tire that is made there.I am 6 ft. so you can see the size of this tire.

 

There's a beginning to a math problem somewhere in that picture.

 

 

^^^^^^^^^^^^
Yep!

 

That's a big one alright! The mining industry around here uses a LOT of those things (and they're not cheap). They get recycled for all kinds of uses after they wear out. I snapped this pic back in the summer at a local dirt race track. These aren't hardly as big as the one in your pic.

 

Until I switched mines this fall I spent a lot of time in a Cat 793 240 ton overburden truck. It carried up to 280 tons many times. Its six tires were 12 feet in diameter, with a price tag of almost $40,000 a tire. The goal was to get 7-8000 hours, but sinking into soft ground and getting sidewall cuts would shorten that.

 

'Can I get the free rotate with an oil change please?'

 

Finally, a solution to stock rear gears! Can you get them in WWW's?

 

Put 4 of those donut holes on my truck and I could have air ride.

 

Let's see, with 12 foot diameter and 3.92 gears that give me 164 mph at 1500 rpm.
I'll take it....

 

I'll bet our friend "photoshop Bob" could help us find a set.