From memory my best 1/4 was 12.2 or so.
That was with the 17 inch road tyres (Kumho Excsta KU36)
Here is a time slip over 1/4 with Goodyear Billboards.
Thats a 1.8 60ft.
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.