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A bit of quick searching says there are already head tracking mods for GTA V, but don't think anyone has tried with GTA Bike V.
I'm not actually sure why it needs a mod at all - I would have thought the head tracking input just emulates control inputs, e.g. A and D keys or controller left-right axis?
I do need to do a bit more tweaking though - as you can see from screenshots, first person view is looking too much at the road and not enough at scenery, apparently that can be fixed.
I'm using an Xbox controller for steering. Quite good fun to steer offroad courses (there's one round a gravel mine which is really good) but a bit tedious on long routes where I have to keep tweaking the controller to stay on a straight road, so I turn auto-steer on. Although it can glitch a bit sometimes.
Probably feels more natural with 'proper' steering device though.
Just did a loop of the whole island, took just over an hour at easy pace. Note I'm in primary position, amusingly when you do that the cars treat you like a car and only overtake you if it's safe, but you get close-passed if you ride in the gutter ;-)