I would definitely go PN for tires. They make both RCP radial and slick tires for most applications and racing styles. I've used mostly the rough side in the past but am now favoring the smooth for reasons others have posted above. One quick tip, it is useful to take a very lightly dampened mop to the top surface of the smooth side of the tiles, once in the morning or once before you use the track. It helps to take the dust off the surface of the smooth side that has collected over night.
Personally I would avoid any tire offering from PN at all costs. Historically the issues with them dissolving in the unopened bags, the inconsistency from batch to batch as well as bag to bag within a batch, the less than ideal wear characteristics coupled with the handling changes that can be experienced during a single run would keep me from even considering them. They can make you go fast but the side effects aren't worth it to me. I prefer a chassis dependent set up as opposed to a tire dependent set up that will change during the course of a run based on tire temp or debris accumulation caused by an overheating tire.
These comments are likely to bring out some haters that believe that the PN flavor of Kool-Aid is the only one out there. Don't get me wrong. I feel that PN makes some of the best kibble and bits out there but I just don't feel that way about their tires. Just don't get caught in the "if you want to be the fastest you must have this or that" Don't eat it Elmer, it's caca.
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