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The R6 drops off real fast when it is done, but the V710 seems to lose a little of its edge and then it stays pretty consistent. Its a great tire for HPDE because it lasts, but for overall grip I think the A6 wins.
The A6 is a great tire for autocross which is what it's designed for, but you need to have deep pockets to run it for HPDE. The 710's fall off gracefully.
I prefer the 710 for HPDE. The one time I tried the A6 they fell off bad after 15-20 minutes, pushed out, and put me in the bushes. 710s never gave up through a 25 minute run like that for me.
I'm confused. TireRack website says: Most sizes of the Ventus Z214 are available in two high-grip tread compounds, with the C51/Medium compound focused on track use and the C71/Soft compound tuned for autocross competition
I prefer the 710 for HPDE. The one time I tried the A6 they fell off bad after 15-20 minutes, pushed out, and put me in the bushes. 710s never gave up through a 25 minute run like that for me.