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Speedometer reads 10% too high

Hi. Since I bought my used 370Z several years ago, it's been bugging me that my speedo is way off from any readings on my GPS. I have checked it

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Old 11-21-2023, 03:50 PM   #1 (permalink)
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Default Speedometer reads 10% too high

Hi. Since I bought my used 370Z several years ago, it's been bugging me that my speedo is way off from any readings on my GPS. I have checked it with Google Maps on three separate mobiles. It's around 10% (maybe a bit less) too high. Speedo shows 100km/h and my GPS shows 92-93km/h. Do these readings happen to other Z owners? What makes gives me a bit of a clue is that the previous owner equipped Z with aftermarket rims (Work). But the tyre profile and rim size is like stock : 275/35ZR/19 on rear and 235/40ZR/19 on front. Could my rims differ (although too 19") so much from stock 19" that it has different diameter, thus false reading?
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