When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
When I'm on my Sporty I just set my helmet and gloves on the seat. I had a pair of gloves swiped at my local HD dealer, but nobody's ever messed with my lid.
I just hang mine on the bars with my gloves in it. I've never had a problem. Of course, I'm in Texas where you can get shot for screwing with other people's stuff. So, most folks here just leave things alone.
I hang my FF helmet chin bar on the rear right turn signal. Then I run a small cable lock through the rear wheel, over the rear fender, and through the chin bar.
Just make sure if you leave it on the seat that it is secure. I was on a ride out west a few years back. After a long riding day and a helmet covered in bug guts I left it on the seat and it must've rolled off. Came back and it was in the grass and covered in ants. they were feasting on the smashed bugs. I didn't think I'd ever get them out.