On September 19, 1999, about 1830 Eastern Daylight Time, a Piper PA-22-150, N5959D, was substantially damaged while landing at the Minerva Airport, Minerva, Ohio. The certificated private pilot and two passengers were not injured. Visual meteorological conditions prevailed and no flight plan was filed for the local flight conducted under 14 CFR Part 91. According to the pilot, he had landed on Runway 19, a 2,500-foot long grass runway. During the rollout, at about 25-mph, as the brakes were applied, the airplane veered sharply to the left side of the runway. The pilot attempted to respond by adding left rudder, but the airplane nosed over. A Federal Aviation Administration Safety Inspector examined the wreckage on September 20, 1999, and revealed that the right main wheel and tire exhibited grass and mud on the outboard side. Evidence of grass and dirt were also jammed into the tire bead area of the tire. All tires on the airplane were inflated. No defects with the tires, wheels, or brakes, were noted. The winds reported by a nearby airport, at 1851, were from 190 degrees at 5 knots.