Reddit mentions of PROSHOT Helmet cam mounting System (Black)

Dango Designs Gripper Mount
I’ve seen a lot of youtubers promote these and they actually are really good! I made a short vid with my hero7 on YouTube that shows off the camera angle here . I love it!

There is also the Pro Shot
People also really swear by these. The reason the dango is cool is that it clips onto your mouthpiece so there’s no Velcro or anything once you remove it.

Used to do chin, but it blocked the front air vent too much which sucks in my hot climate.

Got a side mount and it works great, I dont feel anything weird even at high speeds.

If you do go chin mount, there are some that are essentially a giant V shape, with the legs of the V being flexible and they stick to the sides of the helmet. That should work on anything imo. Example

If you were looking to spend a little more then the YI Action Camera works pretty good. I personally use it on the trails and it works well.

Along with the camera I would get the Proshot Helmet Mount System if it works with your helmet. I also use this on the trails and it hasn't moved at all since I put it on due to the heavy-duty velcro they use (I've also crashed a couple times while it was on and it hasn't budged). The chin mount also has no wind resistance, so when going fast speeds your head wouldn't get pulled to a side and branches wouldn't knock it off your helmet.

A Sandisk Extreme MicroSD is what I use and it is fast enough to do 1080p 60fps.

Overall this would cost you ~$140 for all three items. The camera also comes with a free battery offer on amazon so you would have two batteries to get you through a couple riding sessions. (Each battery lasts a little more than an hour)

Here is some footage at 1080p 60fps