I have calculated my tires 10 time and come up with numbers that is not even close. I have a edge programmer in a 02 screw. I have 315x70x17 tires can someone tell me the size in mm to enter into my programmer?

 

Your width of rim will affect the revolutions per mile. I put in the generic number for mine and adjusted from there. Now my speedometer matches the gps mph. 605 would be a starting point. If your speedometer reads fast change it to 610 or so, if slow change to 600. Continue adjusting till it is dead on. Here is the link.
http://www.1010tires.com/tiresizecalculator.asp

 

Based on your number Jerry, I think the OP needs to post more information, which is what programmer he has and the required input. My programer ask for tire circumference in mm, so I enter 2651 into my gryphon - which is a completely different range than what you posted.

 

He says he has an Edge and he asks for mm, which is correct. Revolutions does not help him. 2660 allows for a 3% squish, so I would start with that and use a GPS to get it perfect. The 2651 will work as a starting point as well.

 

LOL, thanks I don't know how I overlooked "Edge" in his OP.

 

And I just flatout misread. Mine asks for revs per mile. The tire calculator will tell you mm as well. But that will just be a starting point as both squish and rim width will slightly affect the overall size of the tire.

 

Thanks for the help all. I had it written down somewhere but cant remember where i put it. I returned my truck back to stock because i am getting a new motor put in it and will need that number again. Thanks again for the help!