The private pilot reported he was landing his tailwheel airplane on a hard-surfaced dry runway, which required a correction for a 5 knot right crosswind. The airplane was operated under Title 14, Code of Federal Regulations Part 91 as a personal flight. During the landing roll, the airplane’s tailwheel began to shimmy, and the pilot applied a slight amount of forward elevator to stop the shimmy. He said that the airplane then swerved to the left, and went off the left side of the runway. The airplane subsequently ground looped to the left, and the right main landing gear collapsed, striking the right wing on the gravel-covered shoulder of the runway. The airplane sustained substantial damage to the right wing spar. The pilot indicated that there were no preaccident mechanical problems with the airplane, other than the tailwheel shimmy. On May 29, under the supervision of the NTSB investigator-in-charge, the tailwheel was disassembled and inspected, and no preaccident mechanical anomalies were discovered.