I've been racing stock indoor asphalt and haven't had any problems with purples. But, I tried 19T the other day and 3 minutes in the purple's where heating up fast and starting to over steer mid and exit. So what brand black's (crc or parma's)? I'm going to be racing 19T outdoors at the eXpress Paved Championships in June. I'm going up in May for some practice. I'm okay with setup. Was not sure on tires. I have Parma's, CRC's and Jaco 2 stage all flavors.