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Old 06-05-2011, 12:06 PM   #1 (permalink)
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Been playing around with new wheel choices for my GLS. One of the stats I see all over is speedometer reading difference. Wondering if anyone knows if the different trim levels have different calibration based on wheel size. Is it configured by the car on the assembly line? Is there a separate configuration used for SE's w/ 18"? 17"? How does this work?
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Old 06-05-2011, 12:23 PM   #2 (permalink)
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As long as proper "plus sizing" for the tires is maintained when changing wheel sizes, the rolling circumference of the wheel/tire assembly shouldn't change significantly and no recalibration is required. You can use this calculator to compare tire sizes and determine the change in circumference between them-
http://www.miata.net/garage/tirecalcold.html
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Old 06-05-2011, 01:54 PM   #3 (permalink)
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QUOTE (cash86 @ Jun 5 2011, 09:06 AM)
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Been playing around with new wheel choices for my GLS. One of the stats I see all over is speedometer reading difference. Wondering if anyone knows if the different trim levels have different calibration based on wheel size. Is it configured by the car on the assembly line? Is there a separate configuration used for SE's w/ 18"? 17"? How does this work?
All of the YF tire/wheel packages from the factory are close to the same diameter. I use a ScanGage and GPS to have a secondary speedometer which is pretty accurate. Using it's data I know that the cars speedometer would be most accurate with tires measuring about 26.9 inches in diameter.
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Old 06-05-2011, 07:27 PM   #4 (permalink)
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QUOTE (Scott2011 @ Jun 5 2011, 01:54 PM)
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All of the YF tire/wheel packages from the factory are close to the same diameter. I use a ScanGage and GPS to have a secondary speedometer which is pretty accurate. Using it's data I know that the cars speedometer would be most accurate with tires measuring about 26.9 inches in diameter.
The stock 18" wheel tire size is 225/45/18. The diameter would be 25.97 inches

The plus 18" tire size some forum members are using is 245/45/18. The diameter would be 26.68

Are you saying the larger tire size is actually more accurate than stock?
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Old 06-05-2011, 07:34 PM   #5 (permalink)
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QUOTE (SharkyZiff @ Jun 5 2011, 04:27 PM)
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The stock 18" wheel tire size is 225/45/18. The diameter would be 25.97 inches

The plus 18" tire size some forum members are using is 245/45/18. The diameter would be 26.68

Are you saying the larger tire size is actually more accurate than stock?
My original Limited 17's are 26.3" diameter. My correction factor for speedometer error is + 2.5%. 26.3 x 1.025= 26.9575".
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