A simple effective plastic hook will hold your helmet to your bike. This isn’t meant to be something you lock to your bike. This is meant to be quick access for you when you’re off riding in the woods. Riding in the woods usually means you don’t have mirrors (and if you don’t, they’re flimsy as all get-up), you’ve likely got handguards (and don’t want something hanging off the ends of your bars to clip a tree), and means you likely have crap all over your footpegs (yeah, I want that black peat moss all over the inside of my helmet as much as you).
Simply Zip-Tie one of these hooks anywhere on your bike, and you’re good to go. If zips don’t work, you can run a quick screw through and afix the hook just about anywhere. Panniers, luggage racks…whatever!
Contact for availability.