I didn't know that he was an enthusiastic biker but his daughter describes him jumping on one of his bikes and going for long rides in the desert. His jacket that sold at auction for 2500.00 and a year later is on eBay for 3500.00
The Clint Eastwood movie was "Coogan's Bluff" (1968), the girl is Susan Clark. Coogan's Bluff is a hill in the upper Manhattan neighborhood Washington Heights, overlooking what used to be the Polo Grounds, former home of the NY Giants. Film took place in Ft. Tryon Park, same area. His character was also named Coogan. http://www.imdb.com/title/tt0062824/