I'll beat the dead horse and repeat what everyone else is saying, make sure you get tires that are specific to supermoto.....
Reason is that I know alot of guys that will run slicks ment for road race bikes and they have problems getting their tires up to proper operating temperature. This is because of 2 main reasons..... #1, your typical supermoto bike will weigh anywere from 150-200 lbs less than a typical road bike, and #2 your typical supermoto bike is putting out about 1/3 to 1/2 the power that your typical road bike puts out so the tires will have different compounds and construction characteristics.