this past Sunday was an event at the Lyon Air Museum, Bikers and Bombers, and 2 sidecar equipped bikes that were owned by Steve McQueen were there, one is a Von Dutch restored Panther, also, 2 tank tread bikes were there. Photo galleries soon, here's a preview

 the above Panther was made in 1937, the below Harley was made in 1921

both the above and below are 1943 NSU Kettenkrad HK 101s