I was impressed with the radical demarcation between the two compounds in the above picture too. Never seen it so well illustrated before. Not sure if that is a good or bad thing.
As for ionbeam's tire wear vs the same model tire above, I wonder if the difference is related to the loading. I can attest that on the ride to and from CFR we were loaded for a week long tour, were two up and I led the group through some fun sporty roads through Vermont and the Adirondack mountains. That said, my own half worn PR2 rear didn't suffer nearly as much wear under nearly the same circumstances (ion's pillion is a bit bigger than mine). Perhaps the GTs are just not cut out for such heavy loads?
As for ionbeam's tire wear vs the same model tire above, I wonder if the difference is related to the loading. I can attest that on the ride to and from CFR we were loaded for a week long tour, were two up and I led the group through some fun sporty roads through Vermont and the Adirondack mountains. That said, my own half worn PR2 rear didn't suffer nearly as much wear under nearly the same circumstances (ion's pillion is a bit bigger than mine). Perhaps the GTs are just not cut out for such heavy loads?