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Tires & Wheels Forum Discussion of Tires and Wheels...pretty obvious, eh?
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03-26-2008, 02:57 PM
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#1 (permalink) |
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Diesel Freak
Join Date: Jun 2007
Location: Baltimore, MD
Posts: 898
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Need help on conversion
If my odometer says I ran 518 miles on a tank of gas with 315/70/17 tires... How many miles did I actually travel? Thanks
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2005 2500 QC, 4x4, Short Bed, SB 3600 DD, NV5600 6 Spd, 35/12.5/17, Amsoil 6080, straight pipe, boost fooler, Smarty TNT setting 5, Dipricol Pyro, Boost, & Fuel Press, Straight pipe, weatherguard truck box, silencer ring gone, HID's, Cobra 29 WX NW ST |
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03-26-2008, 03:58 PM
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#2 (permalink) | |
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Cummins Enthusiast
Join Date: Oct 2006
Location: Houston, TX
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Quote:
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03-26-2008, 04:03 PM
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#3 (permalink) |
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Diesel Freak
Join Date: Jun 2007
Location: Baltimore, MD
Posts: 898
Thanks: 2
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265/70/17 are stock tires on a 3rd gen?
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2005 2500 QC, 4x4, Short Bed, SB 3600 DD, NV5600 6 Spd, 35/12.5/17, Amsoil 6080, straight pipe, boost fooler, Smarty TNT setting 5, Dipricol Pyro, Boost, & Fuel Press, Straight pipe, weatherguard truck box, silencer ring gone, HID's, Cobra 29 WX NW ST |
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03-26-2008, 04:10 PM
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#5 (permalink) |
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Cummins Fanatic
Join Date: Sep 2006
Location: Huntington Beach, CA
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Okay, put your thinkin' caps on... You would first have to determine what size tire your speedo is calibrated to. Then, determine the circumference of each size tire (C1 and C2). Circumference = Tire diamater(in inches) X 3.14159 Divide 1691712 by each tire circumference (in inches) to convert to miles (C3 & C4), this should be a tiny decimal. C3 = 1691712 / C1 C4 = 1691712 / C2 Next, Divide the mileage on your ODO (M1) by the "calibrated" tire circumference (C3, NOT C1). This will give you the number of rotations that the axle made over the trip (Call this R) M1 / C3 = R Now, Multiply the number of rotations (R) by the new tire cirumference (C4, NOT C2) and you will have the number of MILES that you actually traveled. Kinda long, hopefully not confusing. Just write down your numbers and follow the formulas. :thumbsup
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