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Message: <blockquote data-quote="GDTrumbo" data-source="post: 481612" data-attributes="member: 10665">Well, they are a new tire so, for the track.... ??? What is the treadwear rating for the Nitto's?, That's a good place to start. If the Nitto's have a rating down around the 200-250 range, the Nitto's grip on the track is obviously going to be a little better. The Raptor ZR's I bought have a "Z" speed rating with a "W" suffix. They keep their shape up to about 168 mph. The only higher speed rating is a "Z" rating with a "Y" suffix. That's good to about 186 mph. So it's got a pretty stout carcass to it. Mine is a DD so I try to get a high speed rated tire with a little harder compound for longevity. By all means..... shop around. Good Luck.GT</blockquote>