I wear a Nolan so regular helmet locks don't work. I usually clip it to the crash bar on the V-Strom or to a cable mounted to the helmet lock on the Royal Star. At work no one is likely to mess with my helmet.
2007 Yamaha Royal Star Tour Deluxe
2005 Suzuki V-Strom 650
2005 Yamaha XT225
1998 Ural Deco