It is unreal how much better these are than the SUR4. After driving the two back-to-back, the Sport R feels glued to the road, like it is actively spreading out and squeezing itself into every surface detail at the contact patch. It is so much more responsive and delivers better steering feel than the tire it replaces. The sidewall feels stiffer and transmits more information from the road, although this and other impressions could be caused by stepping down to a 275/35R18 from a 275/40R18. During the ~150 miles or so I have driven on them so far, they went through rain without any issue, as well as 40-50F temperatures. They are slick when cold, but so are other tires in this wear category. They seem to warm up and gain grip quickly. I look forward to trying them on the track soon for a full comparison. My one request would be a 275/40R18 and/or more sizes around that width and diameter, please! Shout out to True Performance Motorsport for excellent service installing the tires and their expert advice.

i HAVE USED THESE NOW FOR TWO FULL WEEKENDS , SATURDAY AND SUNDAY , ALL DAY, EXCELLENT GRIP AND WEAR AND YOU CAN CROSS ROTATE THEM i HAVE A 2004 Z06 WITH ONY 32K MILES..