Reply to 86m1028 -
In 1985 I ordered a brand new K-30 civi Chevy SRW 6.2 diesel. I raised the truck 5" and had my machine-shop buddy build the 20" rims. I was undecided which type of tire to use, however I had access to some new 11.00/20 NDT military tires, so I decided to mount them and run them a few weeks until I could decide on other tires. The first thing I noticed was how smooth and easy the truck rolled and turned. Then after driving it across town to work and back every day for a couple weeks I realized that I had not purchased any fuel, so my mileage had indeed improved. I kinda got to liking the things and decided to leave them on for a while.
Now fast forward to 1989. After 125,000 miles, I purchased my second set of 11.00/20 NDT tires. These were on the truck when I sold it to my neighbor in 1995. That second set of tires were almost worn out, and the truck had 225,000 miles. 10 years, 225,000 miles, and only 2 sets of tires.
2 years ago I purchased my M1028, which was an Arizona National Guard vehicle with only 12,338 miles. I knew that my neighbor had sold the '85 K-30 years ago, however I did not know any details. I ran into him at the grocery store and told him about my new M1028. I almost fainted when he asked me if I wanted those wheels back! He had lowered the '85 back to stock and installed factory wheels and tires in order to sell it easier. He said the wheels, all 5 of 'em, were stored in his barn and I was welcome to them!
So to try to answer your question, I believe the NDT tread pattern provides outstanding traction, economy and value. At 44" tall, axle ground clearance is far greater than smaller tires. The narrow width (12") and rounded profile allows fender clearance with normal trimming. I am running BalanceMasters behind each wheel, which automatically balances the entire wheel assembly without wheel weights. I am completely happy with the truck, wheels, and tires, and will run the NDT's from now on.
Mike Gresham