WHILE DRIVING THE MOTORCYCLE SPEED 20-25 MPH, FRONT TIRES STARTED TO SHAKE, FRONT END STARTED TO JERK, THE ROAD CURVED LEFT, MOTORCYCLE KEPT PULLING TO THE RIGHT, HIT A CURB, FRONTAL IMPACT AND LOST CONTROL, DEALER CONTACTED ,AND CLAIMED OFFICER, ISLAND CYCLE DID REPAIRS, AND NY HARLEY DAVIDSON MANUFACTURER IS REVTECH TIRES - PROBLEM IS DEFECTIVE TIRE VALVE. ISLAND CYCLE IS AWARE OF THE PROBLEM, VEHICLE REPAIRED AT OWNERS EXPENSE WITH DEDUCTIBLE.