Now on kickstarter-a RH-1 Performance Cycling Helmet with integrated video camera.
Arenberg have created the world's first performance cycling helmet with an integrated camera and live video streaming capabilities.
www.kickstarter.com
I don't care about live streaming, but having a front and rear camera on rides would be nice to have, especially if you were hit by a vehicle.
Had some additional thoughts on this helmet cam...
If you just want something to record for security purposes, I'd skip the helmet cam, and consider dedicated cameras.
In the sub $100 range, the one I pointed out in my earlier post is an option, and if you don't care about seeing a live stream on your phone, there are even cheaper options (about $40 US) that will still get you a couple of hours or more of recording time, especially if you're capturing in 720p vs 1080p. Whatever resolution, the video quality will be sub par compared to the RH-1, but many of these cameras come with multiple mounts, so you can use it anywhere.
Stepping up in price a bit, cheaper action cams, like the Akaso Brave 7 LE (about $140 US) will give you a better quality image than the RH-1 (judging by the scant samples on the RH-1 page), but you also have more flexibility in mounting, as they'll come with a number of mounts, and are compatible with GoPro style mounts.
If you want to rival GoPro quality, but don't have the budget for the latest one, the DJI Osmo Action is probably better than any GoPro except the Hero9, just from a picture quality POV, and can be found for about $250, often bundled with a memory card or spare battery. I'd say that if you want quality footage to actually mess around with in post, the Osmo Action is better than the Hero 9 Black, but I work in post production, so color grading and editing is second nature to me.
One thing I'll mention from my experience is that even the GoPro Hero9 can suffer from jittery footage caused by micro vibrations, when mounted directly on the bike and riding on rougher asphalt. I haven't experimented with using thicker foam/rubber as a buffer to compensate for these jitters.
* This is all based on the fact that I haven't seen any full resolution footage from the RH-1, but their example looks pretty blown out in the highlights, and pretty muddy shadows.
** I'm also of the mindset of letting a thing "be its thing" as opposed to compromising something to make it serve multiple purposes, at least when it comes to helmets and cameras, but that's just my taste.
*** if you go with something compatible with GoPro style mounts, super cheap mounting kits like the $22 (Canadian) Neweer 50 in 1 are a great deal. Wrist, helmet, head, chest straps, floaty handle, selfie stick, multiple clips, extenders, tripods, and adapters. Much better than ordering any single piece even at 1/3 the price.