Rpm/mph calculator

Is there a ready built rpm/mph calculator for the M35? I guess that you take the diff ratio times any xfer ratio times the number of inches circ of the tires.

But I am bad at math and want it done for me. BTW what is the circumfrence of the "stock" tires? And how are they designated vis a vis 16x20 etc.

Sorry for the lame description, Im new at this.

Regards
Zeke Duge

Or

Take a piece of string and wrap it around the tire and then lay the string out and measure it. That is the easiest if you are bad at math to get the circumference.

swbradley1 said:

Or

Take a piece of string and wrap it around the tire and then lay the string out and measure it. That is the easiest if you are bad at math to get the circumference.

Click to expand...

Or if the wife sews she should have a cloth tape measure , she won't mind a little road dirt and grease on it

I was going to suggest that but.........

swbradley1 said:

I was going to suggest that but.........

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But the wife was standing behind you as you were typing .

One guy might be already in trouble with his Wife today, we don't need another one. I've only been yelled at twice by the Bosslady, once for dropping cookie crumbs on the floor (homemad choclate chip cookies), and for not putting the broiler pan back where it belongs.

Thanks a lot. Choose A for sincerity B for sarcasm.....

steelandcanvas said:

One guy might be already in trouble with his Wife today, we don't need another one. I've only been yelled at twice by the Bosslady, once for dropping cookie crumbs on the floor (homemad choclate chip cookies), and for not putting the broiler pan back where it belongs.

Click to expand...

Problem is I dont have a Deuce yet, and therefore no tires, unless one of you guys wants to drop by the ranch in central Oregon, I do have string, and Beer.
The other thing I dont have is a wife.....She left after 26 years, and i want the Deuce cause its too quiet around here.
Thanks for the info, and the offer of the Beer still stands.

Zeke

clinto said:

http://www.bgsoflex.com/rpmmph.html

Click to expand...

You know the next question will be, what goes in box ____ ?

So for a deuce and a half (Multifuel, OD transmssion)...

Final Gear Ratio: 6.72

Transmission Gearing Ratio: .79

Tire Diameter in Inches: 41" for 9.00's, 43" for 11.00's, or 46" for 395's.

WOW, now that is a cool calculator. Thanks!

Thanks indeed......

Very helpful, thanks for botht he calculator and the data.


Regards
Zeke

it seems that using the loaded radius is more accurate, i don't really understand why, but that is what the michelin tire site gives. i have also read this several places.
the math is really quite simple:

rpm = (168 * mph * ratio ) / radius
mph = ( rpm * radius) / ( 168 * ratio)