Can confirm the purple stripe Contacts work good and the price is awesome. I don't think I am a good enough driver to truly tell if they are about same as the CRC purple stripe. Need more run time.
The purple strip is exactly the same as the crc ones.
I had the prototype ones, almost three years ago and we tested them back to back with the crc's lap times were consistant. I gave a couple of sets to the bigger Northwest 12th scale drivers to take home and try. Slapmaster had a set or 2. He confirmed our testing we did here in Canada. The only difference was the rim softer at the time.
Update just rechecked Brian's email he whished the wheel was a little softer then it was.