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I can say how long they last or how well they ride on the street, but on the track, they have plenty of grip.
A coupe of months ago I did a couple of hours at the "introduction to BMW" type event at the performance driving center at Thermal and I was surprised how well the Extreme Contacts gripped. This was kind of a 2 hour, just drive the shit out of their M cars type of event, and they tires I can say did pretty well.
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