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GPS Speeds vs Speedo
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[quote][i]Originally posted by AlexW[/i] [quote][i]Originally posted by 3CorsaMeal[/i] i wonder if tyre wear accounts for anything, i don't know how much tread depth a tyre comes with, but your losing the few mm's twice on the overall diameter of wheel [/quote] From what ive seen yes, our van speedo is fairly accurate on new tyres, and gradually starts overreading as the tyres wear. Mind you, the tread is fairly deep on those tyres. Also, its not about the size of the wheels, its the rolling radius, so if you had some 13inch wheels with massive tyres and then fitted 15inch wheels with tiny sidewall tyres, (Just an example, ive no idea if they are the same) then the rolling radius would stay similar and cause the speedo to read the same as it did on the 13s. [/quote]
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