Truck tires
I have a choice of replacing my stocks 265-75-R16 tires with 235-85-R16 or 315-75-R16. Heres' the relevant data for BF Goodrich tires
315 68 pounds 601 revolutions per mile 3.42 (effective) axle ratio 265 54 pounds 656 revolutions per mile 3.73 axle ratio 235 47 pounds 654 revolutions per mile 3.72 (effective) axle ratio The big 315 tires lower the axle ratio, but they will add 56 pounds of rotating mass to the truck; and they increase the frontal area of four tires by about 2 square feet. The narrow 235 tires lower the axle ratio a fraction (almost no effect); they remove 28 pounds of rotating mass from the truck; and they reduce the frontal area by 1 square foot. Will the 315's lower axle ratio make up for their added mass and frontal area, or would the 235's tires get better mielage? |
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I'm thinking hte 315's will hurt mileage, they are a rather large amount wider than the 235's this will not only hurt frontal area, but disrupt more of the flow under the vehicle. The higher vehicle will have slightly more drag, not to mention i'm guessing the 315's will have more rolling resistance. |
What kind of BFG do you plan on running?
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Never heard of Douglas tires
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I'm about to drive 500 miles in a blizzard tonight, so I went out and got new tries for the F350. I replaced the stock Goodrich Long Trail 265/75-R16 with Michelin LTX M/S 235/75-R16. They're skinnier and lighter, but have nearly the same diameter (Michelins are ~0.1 inch taller)
Although driving in snow tonight is not a fair test, in a few weeks I'll be able to see whether there's a mileage improvement. |
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Narrow tires
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