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some good pearls of wisdom there - thanks to all
we used thin sheets of acetate under the tyres but what has been said makes me wonder whether something stiffer would give better feel and therefore better repeatability (just re-read that - sounds like Clare Rayner....)
also, being a road legal hillclimber rather than a trailer queen racer there's a lot of droop on our car and the tyres are quite high profile
another point - the chap we did this with reminded me that the floor we used was level but not perfectly flat as it had zillions of tiny dimples
time to have another go!!
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