I want to put some fairly durage, streetable knobbies on me GSPD. I've heard there is a german tire out there that might fill the bill, but are expensive. Does Shinko make a set of knobs for the Airhead GS? What tires (50/50 dirt/street) should I consider? Want decent pavement mileage, decent hookup in the wet, good off-road tire. Let me hear from you! I need advice! You can get me at email@example.com, too.