The MPSC are great tires.. ran them for the last few events this year. They really need at least 2 degrees of camber though to get them working well. The first event we only were able to get 1.8 degrees in and while they did still work, they didn't have as much grip as they could have.
I don't recommend going to an R compound tire unless you are an experienced track driver, as they can cover up a lot of driver errors and slow down the learning experience.
Marc
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