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Simpler as long as you know what lurks inside the gear ratio and radius and "correction factor." More useful for me to know the details and get the right answer and KNOW it's the right answer. Personal preference I s'pose. And if you know what is in the details it's easy to change the...

I would very much like to know more about these wheels! I have a friend in Calgary that can probably help me get some if I just know what I'm looking for. I'm sending email so you have my address. I'm thinking to run 11.00s on a bobbed 4x4 with duals in rear much like the original XM381 2-ton...

You want to use the tire manufacturer's Rev's per Mile value, NOT the circumference based on OD -- especially with Michelin military tires. The revs per mile is often quite different because the loaded radius is much smaller than 1/2 OD. Then take engine rpm and divide out all the gearing...

calculating road speed I have a spreadsheet to calculate these things. I guess .xls extensions aren't allowed. No macros - just formulas. It includes a bunch of tires we've been discussing and several gearboxes including the Spicer. Email me or PM and I 'll send you a copy of the...