Edge EVo program question
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Senior Member
Joined: Jan 2007
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From: Morrisville,NC.
Edge EVo program question
I just bought the Edge and I was reading in the manual that I can change it to reflect the tire size I have, although it was a little confusing. The manual had numbers for all different tire sizes from a 15 inch rim to a 18 inch rim. I am running 35/12.50/ on the factory 18's. What is the millimeter setting I should be using? -Thanks in advance!
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Joined: Sep 2003
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From: Doylestown, Pa.
The Edge manual gives numbers of typical circumferences of given tire sizes and are merely numbers that will get you close to actual.....but not really!
Example: Edge manual states that my tire size, 285/75R-17, will have a circumference of 2698mm, which was not even close to actual. It is best, and more accurate, to measure the circumference of your tire by placing a mark with chalk or other means on the tire and pavement where tire and pavement meet the ground and then drive slowly until that tire has rotated one revolution. The mark on the tire should now meet the ground in the same area as before. Now, make another mark on the pavement where it lines up with the mark on the tire and measure between those two marks. This will give you your true tire circumference based on diameter, weight of vehicle and tire pressure.
That is only the first step.
Example: My tire measurements for the 285/75R-17 came out to 2520mm with 40psi tire pressure. That is the number, 2520, that I programmed into the Edge device. That number caused the speedometer/odometer to clock to slow and I used a slightly higher number to compensate for tire growth as you drive. Ever see drag racers tires get twice as big when the leap from the starting line? Same thing here.
My final tire circumference number turned out to be 2551 and with the proper gear ratio programmed into the Edge, I was able to get exact speedometer/odometer readings that are only off by a .10 of a mile after driving 100 miles. It doesn’t get any better than that!
Example: Edge manual states that my tire size, 285/75R-17, will have a circumference of 2698mm, which was not even close to actual. It is best, and more accurate, to measure the circumference of your tire by placing a mark with chalk or other means on the tire and pavement where tire and pavement meet the ground and then drive slowly until that tire has rotated one revolution. The mark on the tire should now meet the ground in the same area as before. Now, make another mark on the pavement where it lines up with the mark on the tire and measure between those two marks. This will give you your true tire circumference based on diameter, weight of vehicle and tire pressure.
That is only the first step.
Example: My tire measurements for the 285/75R-17 came out to 2520mm with 40psi tire pressure. That is the number, 2520, that I programmed into the Edge device. That number caused the speedometer/odometer to clock to slow and I used a slightly higher number to compensate for tire growth as you drive. Ever see drag racers tires get twice as big when the leap from the starting line? Same thing here.
My final tire circumference number turned out to be 2551 and with the proper gear ratio programmed into the Edge, I was able to get exact speedometer/odometer readings that are only off by a .10 of a mile after driving 100 miles. It doesn’t get any better than that!
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Joined: Mar 2005
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From: Texas in the heart
I also had to use the rolling measurement method. It's far more accurate than any other method.
I also have a couple of gps units that I use to check mph. once you have a ball park figure on the mm, you can use a gps to fine tune your settings.
But you must start by measuring your tire and getting a good baseline from there.
I also have a couple of gps units that I use to check mph. once you have a ball park figure on the mm, you can use a gps to fine tune your settings.
But you must start by measuring your tire and getting a good baseline from there.