Thread: How out are the standard clocks?
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Old Jun 8, 2007 | 07:38 AM
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cossymad
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From: essex
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As a rule it is around 8%, i.e. a reading of 70 on speedo is 64.4mph
I was showing with standard wheels, 161mph on the speedo and 151mph on GPS, then on 19's it read 160 on the speedo and 160 on GPS
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