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#3
Wed, July 29th, 2009, 01:12 AM
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As Jack said... technically a 35" tire would be 2792mm. Compensating for squish, we have found that 2762 works really well for most 35" tires. Of course, the tire manufacturer's specs are the best way to go. If they have a rev/mile value for your tire, that that number and use this formula...
1609344 / Rev per Mile = Circumference in mm Keep in mind that air pressure, tread wear, and ambient temperature can affect tire circumference and revs per mile. If all else fails, GPS it and make minor adjustments until it's right. 
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Bill Cohron - The Mad Doctor   Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997! (678) 890-1110 www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar! Bring back  Windows™ XP and 7.  Windows™ Vista and Windows™ 8 is a pain in my a$$!  Windows™ 10 is only slightly less annoying!  Windows™ 11 is garbage!  Much to my surprise, I'm actually quite enjoying Linux! 
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