Hello, It works on a nickel-ventilated helmet (be careful to choose the place where the camera is raised significantly because we feel its weight on the distance) was the exception that once installed (no need for manual is enough Intuitive on this one), we do not know what to do the excess strap that is not too large (use a rubber?). Since we should not cut (!) I put in the extension of the helmet (90 ° so). This has the effect of hearing tapper on the helmet when riding in windy weather and that turns his head a trifle ... so ... it will therefore better for that piece of webbing :) Oh yes: last advice to not spoil his first outing: tighten the fixing screws as by tapping the camera with a branch, the camera will make a beautiful film from heaven for the rest of the trip ... :)
