cmkworm
02-23-2007, 08:07 AM
Ok, I have 265/75/16 on my truck. Using a tire calculator on a different site it says they are 31.63" tires. My tuner goes in .25 increments. Is this size correct and should I just go with 31.50 on the tuner?
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ssduramax 02-23-2007, 09:04 AM you are probably right on without adjusting the speedo with the programmer with your tire size. What i found was with the stock tires I was about 3 mph slow with my 285/75/16 tires, i was about 3 mph fast, so, with that logic, 265/75/16 should be right on the money with no adjustment. try it with a gps and see what you come up with. ssduramax 02-23-2007, 09:10 AM check out the pics of my speedo vs GPS when i went from stock to 285/75/16 http://dieselplace.com/forum/showpost.php?p=852574&postcount=5 cmkworm 02-23-2007, 10:19 AM you are saying that I should adjust it with the tuner or not? The tuner goes by inches too, not tire size as in 268, 285, and so on. swisstyphoon 02-23-2007, 01:29 PM your result is correct! :think: 265mm -25% = 178.75mm 2 x 178.75mm = 397.5mm 397.5mm : 25.4 = 15.649" 15.649" + 16" = 31.649" | ||