Quote:
Originally Posted by Tannaton
As said above, if the larger tyres are on the front it will make your speedometer read less.
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My understanding is that this would be illegal. Speedometers may over-read (ie indicate you are going faster than you actually are) by something like 5% (might even be 10%, I'm not certain) but may not under-read at all (ie indicate you are at the speed limit, whereas you are actually speeding). That is one reason why so often you see cars driving at a few mph below the speed limit - car manufacturers err on the safe side, and routinely slightly over-read, so the driver often assumes incorrectly that he/she is driving at the limit whereas in fact is driving below it (easily checkable with a GPS on a straight and level road). You should ensure the tyres on the front are no larger than whatever the car is meant to have per the owners handbook.