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| Gryphon Programmer (Disabled) Edge Product has discontinued the Edge Evolution 2, but we still provide support and tuning for it. If you have a question or comment relating the Gryphon (or Evolution) programmer, post it here. |
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#1
Thu, March 5th, 2009, 10:44 PM
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In almost all cases for 35" tires, I usually start at 2760mm and work from there. You may also check the manufacturer's website and see if they list a "Rev per Mile" rating for the tires. Take that value and calculate mm using this formula:
1609344 / Rev per Mile = Tire Size in mm Don't forget the "3 roll" method. Mark the tire and ground, roll the tire forward 3 times, mark the ground again and measure. Divide by 3 and there you are. Don't forget to convert inches to mm by multiplying by 25.4. Hope this helps.
__________________
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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#2
Thu, March 5th, 2009, 11:58 PM
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Mahalo to blackfx4ny, Jackand Janet, and Bill for all of the information. I'll use the the figures that you guys provided and go from there. I'll contact my sister-in-law and see if I can borrow her GPS to try and get an accurate tire size. By the way, after I posted the thread, I installed the Gryphon. The instructions very were easy to follow. Went out for a short drive using level 2. All I can say is WOW!!!!
 What a difference. Makes me anxious to know what the custom tune will do to the truck. Corey and Bill, mahalo for the great product and service.
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