Originally Posted by chktm
I think this would be a great grass or really grippy track tyre setup.
The ''glaswegian insert'' on the M5 seems to do very well on grass with an even and smooth surface.I'll bet any Arx450 owner will concur. As Gartenzweg was speculating about hard inserts being the best way on road, so I suspect nice flat grassed ground (eg Millenium Stadium, Cardiff) would be best with a rock hard insert.
The problem of course is all the little stones, that scaled up, become huge monsters! That's where this thread belongs. Finding what works in less than Savile Row Pressed surfaces.