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Old 10-16-2007, 04:56 PM
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14" to 16" tires gear ratio change?

im going from 14" tires to 16" tires, ive got a stock 3.00 rear gears how much will the 16" change my ratio? lower higher? thanks. probably common sense but i cant do the math.

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Old 10-16-2007, 05:04 PM
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What is the outside diameter of the tires? Some 15 inch tires have the same diameter as 16 's do....measure and see how tall the tires are...if they are the same then nothing has changed...if one is a lot taller then it will give the effect of a higher gear ratio.
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Old 10-16-2007, 05:36 PM
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This will help you chose a tire to maintain the same final drive ratio. http://www.miata.net/garage/tirecalc.html

Shane
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Old 10-16-2007, 07:57 PM
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If you increase the height of the tires, say from 25 inches tall to 26 inches tall, the effective gear ratio will be lower numerically.

For instance if your gear is 3.08 and you go from 25 to 26 inch tires, the effective gear ratio becomes 3.08 multipled by 25 and this result then divided by 26, which equals 2.96.

For any change first multiply by the original tire height then divide by the new tire height.

John
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