R71 are a great tire but they are soft and sticky. Time attack guys will run them only for one session because they go away that fast and there times start to drop off. There are a number of cheaper tires that are just a tad slower but last longer. I highly recommend going g to 18" wheel setup to bring down the cost of tires and increase the number of tire choices. I am running Nitto nt01. They are probably not any slower than r71 at my stage of driving right now but they last many sessions more than the r71s. They also get better as they wear down. Many go fast guys swear by them. Other offerings are Nexgen and Maxxis as I have heard good things about them.
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