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Wheels & Tires Semi-Tech General discussion of wheels and tires for the Ford Ranger.
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Old 06-09-2011
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Spedo offset

If i am going with 31s or 32s how bad will it set off my spedo if at all
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Old 06-09-2011
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Year and drivetrain please
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Old 06-09-2011
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Indicated Speed x (New diameter/factory diameter) = actual speed with the new tire diameter

Example: 60 MPH indicated x (35"/28") = 75 MPH actual with the larger 35" tires in place of the stock 28's.

You can use a similar calculation for any other speed point or diameter ratio. Be aware that many tires sized in inches like "31" or "32" are often actually 1/4 ~1/2" smaller than the label implies. Don't ask me to explain that.
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