All the tracks I raced were tight point and shoot course that a 170/60 did fine. Thought I had hit the big time on a 180 sized slick. The longer tracks we ran only got a slightly better tread footprint on maybe 3 of their 10 or 11 corners so not a huge advantage there.
in the end the greater footprint at lean and traction ability of that footprint was largeley determined by setup and that by a fine fine line...
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