Pete, I don't know. I test drove 2 430's and they rode like commercial trucks! The 320's that I test drove(4 or 5) were much smoother and pliant(sp?). If the 320's had Generals on them, they rode harder. The Dunlops were sweet. Now my info is dated. Maybe things have changed. Either way,that's why different models and different colors are offered. We can make our own choices. Have a nice day.
