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Yup - c.4% faster.
I'll keep the tyres for the time being because they're too good to trash and also
taking into account that the 997 set up will mean you're travelling 2.5mph faster than an indicated 60mph.
However, at 60mph your true speed is around 5% less, so by accident, I have a pretty accurate speedo till I change to 986 sized tyres.
Is my logic sound?
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