Adjusting for 315/70/17
#1
Adjusting for 315/70/17
I went to the dealer today and adjusted my speedo.
Didn't seem to have an actuall tire chart for it so had to do the math.
Measured wheel travel that came to 8 feet.
5280/8 came to 660.
I have seen on here people saying 601.
Why would mine be so different?
Is the math wrong?
Didn't seem to have an actuall tire chart for it so had to do the math.
Measured wheel travel that came to 8 feet.
5280/8 came to 660.
I have seen on here people saying 601.
Why would mine be so different?
Is the math wrong?
#2
Registered User
Because that circumference seems to be incorrect for a 315/70R/17 tire. 601 is the BFG rpm specification for the 315/70R/17. Tire calculator I use says circumference is 107.9 inches (8.9xxx feet). I used the 605 rpm from another owner that verified with GPS. Mine is as close as you can get. Try this link.
http://www.1010tires.com/TireSizeCalculator.asp
BF Goodrich spec sheets
http://www.bfgoodrichtires.com/asset...rain_ta_kd.pdf
http://www.1010tires.com/TireSizeCalculator.asp
BF Goodrich spec sheets
http://www.bfgoodrichtires.com/asset...rain_ta_kd.pdf
#3
Registered User
Originally Posted by sparky3008
I went to the dealer today and adjusted my speedo.
Didn't seem to have an actuall tire chart for it so had to do the math.
Measured wheel travel that came to 8 feet.
5280/8 came to 660.
I have seen on here people saying 601.
Why would mine be so different?
Is the math wrong?
Didn't seem to have an actuall tire chart for it so had to do the math.
Measured wheel travel that came to 8 feet.
5280/8 came to 660.
I have seen on here people saying 601.
Why would mine be so different?
Is the math wrong?
#4
Sorry my memory sucks. Stock was 657 and he set it to 621.
They are arguing with me that I am wrong. I am taking them in the bfgoodrich chart and the calculater results.
Fun Fun
They are arguing with me that I am wrong. I am taking them in the bfgoodrich chart and the calculater results.
Fun Fun
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