Edge programmer tire size help please!!

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Old Apr 13, 2014 | 09:37 PM
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dlegit's Avatar
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Edge programmer tire size help please!!

I have a 2006 f-150 fx4 i just put 20" wheels and some open country togo mt tires size is 33x12.50xr20 i can't for the life of me figure out the MM circomfrence that edge is asking for I'm horrible at math please help me !
 
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Old Apr 14, 2014 | 03:47 PM
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From: Among javelinas and scorpions in Zoniestan
The math is simple: 33 x pi x 25.4 = circumference without weight on the tires.

Multiply that result by 0.97 to account for the "squish" caused by weight which will give you a good starting point. For your tires, start with a value of 2554mm, and make adjustments from there.

Make sure your Gear Ratio is correct whenever you open the custom options menu! It might need to be changed.

- Jack
 
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Old Apr 15, 2014 | 01:19 PM
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From: Joplin MO
Fine tune it till the Edge speed (not the speedometer) agrees with a GPS.
 
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Old Apr 15, 2014 | 05:00 PM
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From: Among javelinas and scorpions in Zoniestan
Originally Posted by glc
Fine tune it till the Edge speed (not the speedometer) agrees with a GPS.
Thanks, I should have said that myself! These old brain cells just keep drifting off....

- Jack
 
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