I did some asking around at the Birds for tires in 17.5, just trying to find something that worked.
Wiita and Tony Block were on CRC Chrome/GreyLows. Ehrlich was on CRC Black/GreyLow(or at least was after his initial TQ run in Round 1). Stephen Boice was on Jaco Lilac/Orange. I heard Trandell was on Jaco Black/Orange, but do not know for sure. I believe Smyka was on BSR Grey/White(same as CRC Yellow). Robbie Dodge and Craig Xavier were running the Gravity tires... Robbie mentioned he was running Hard fronts/Soft rears. Not sure what Craig was running.