Re: Running an oddball size spare on a 4x4
Got me thinking, so I did some math. If you drove in a 300' diameter circle (typical diameter of a 40 to 45 mph cloverleaf) for one mile, you would go around it 5.6 times. Inside tire would travel 5280 ft (1 mile) and the outside tire would travel 5403 ft, or 123 ft more. If a 315/75-16 tire shows 601 revolutions/mile, then the inside would do 601 revolutions and the outside would do 615. Obviously the tighter the circle the greater the difference traveled between the two tires. On a 100 ft circle (tight mountain road) the difference is 42 revolutions per mile - 370 ft.
Does any of this really matter.
If you have a mismatched spare - best to run it on the front in 2-Wheel Drive, or on the rear in 4-Wheel Drive, keep your speeds down - and get the flat repaired or replaced as soon as possible.
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Four time Baja 1000 winner, four time Baja 500 winner. Solo'ed the Baja 1000 to LaPaz/Cabo twice.
4-Wheeling since 1972, Desert Racing since 1989.
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