Gearing formula question


Ozwynn

Ozwynn

If you didn’t bleed for it you don’t deserve it

U.S. Military - Veteran
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this is for you math wizzes. my tire size is 295/75/22.5 (39.4"). I am turning 1700 rpms @ 55 mph in what should be my direct drive gear. what are my gear ratios?
 
Last edited:
would you verify that tyre size again as it works out to fourty inches, also 1700 rpm at what speed?
 
I edited, I checked it with the tire size calulator, I got 39.4"...... 55mph ..... this is for my new freightliner.... no axle tag and i need to know the gear ratio.
 
3.55ish, it would be a bit more accurate if you measure the tires with a tape, they usually never measure out to what they're supposed to...
 
ok thanks, that would be 3.58's (common in a freightliner).
 
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