[AdamHeard]

My assumption is that the desire to switch the kop frame to direct drive was to make it harder for teams to not finish matches driving from chain failure. Making the outer axles live axle does nothing to benefit this.

So, to do this cleanly Andymark needs a new KOP wheel that's live axle and cheap. No sense in recreating the outer wheels (which are dead axle), so use the HiGrips.

As for the difference in tread, just trying stuff out I'd guess. Maybe the HiGrips will be sold with such tread as well.