I've been using the Vantrue Falcon 1 motorcycle dashcam setup for several years now and I just bought my third one for my new motorcycle. It's 4k front camera and 1080 resolution in the rear camera, it takes excellent video. I noticed when I bought it last week that its 100 dollars off at Amazon, if anyone is interested. Here's a short clip showing the high resolution of the cameras.
I recommend this system very highly for anyone who wants the security of a full time dash cam.