They're the newer ones, I believe. A little lighter than the older ones, and less of a DH only tire. They chew into the ice really well. I went over some VERY nasty overflow from the Chester Creek yesterday, which is about the slickest substance I know of. The river spills its banks, then refreezes with a sheen of wet water coming in over the top layer after layer. There was a little slippage in the back, but I stayed upright and that's the main thing.