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Pilot Super Sport durometer readings

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Does anyone here know what the durometer reading is for a set of new Michelin Pilot Super Sports? Also, at what reading are the tires generally considered too hard for best operation?

My current set is at about 72 on the outside edge of the tread, moving to 75 on the inside (left side). The right side tires start at 75 on the outside edge and graduate to 80 on the inside edge.

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