The outside circumference of the tyres will progressively reduce as you wear down the tread pattern.
Thus, the more you drive the slower you go, ergo , one day you'll be doing "60kmph" down the road and wondering why grandpa in his motorised wheelchair is racing you off at the lights and beating you! ;-)
G
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"...'cause the only decent things that come in 2 litres are milk & orange juice"
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