Joined: Aug 2008
Posts: 13,140
Likes: 2,162
From: Ann Arbor, MI
Bikes: 15 Kinesis Racelight 4S, 76 Motebecane Gran Jubilée, 17 Dedacciai Gladiatore2, 12 Breezer Venturi, 09 Dahon Mariner, 12 Mercier Nano, 95 DeKerf Team SL, 19 Tern Rally, 21 Breezer Doppler Cafe+, 19 T-Lab X3, 91 Serotta CII, 23 3T Strada
The only dash cams for bikes I can think of are the Cycliq Fly12, the Garmin Varia Vue, and the Insta360 X5. I think the X5 battery will only go about 3hr in dash cam mode, which is probably tight for a 40mi ride, but the batteries are small and quickly swappable, and the 360° coverage is obviously vastly superior to jist a forward facing cam. Even a dash cam and a rear cam combo would lose out to X5 in terms of cost, ease of use, and completeness of coverage (assuming helmet or seatpost pole mounted X5).