My suggestion for parts being stolen while the bike is chained up is...........Red locktight on every bolt possible. If this is done correctly (completely clean and dry threads on both the bolt and what you are threading it to) the only way to take them off is with heat (blow torch) and a wrench with a very large handle for leverage. When I worked as a motorcycle mechanic we used red locktight on every bolt and nut on Harley Davidsons without anything falling off, and if you know anything about H-D that is an IMPRESSIVE feat.