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Your speedo will be 9.2% out and will read higher by that proportion (great for bar stories) using the intended font tyres.
The rears will be marginally smaller or 5% smaller. The 50% aspect ratio will affect fuel consumption but I would doubt whether you will notice any accelleration benefit. Besides with the speedo that far out you might even surprise (fool) yourself. If fuel is not a big issue I would stay with the 50% aspect ratio as the slip angles as well as the cars stance will be better balanced front/rear
Clive
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