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Notice the thick blocks on the side tread. These tires were good for over 5-mph improvements in various turns at Willow Springs. After about an hour's worth of track time, the RA1s still looked really good, and this included my 120-mile trek up there.
Project BMW M3 Part 6: Track Testing

 Notice the thick blocks on the side tread. These tires were good for over 5-mph improvements in various turns at Willow Springs. After about an hour's worth of track time, the RA1s still looked really good, and this included my 120-mile trek up there.  View Related Article

 

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