Pure resolution isn't everything as dynamic range plays a very important role in producing clear and crisp footage. This is the ability of a camera sensor to capture the broadest possible detail in a scene, between its brightest and darkest tones.
The human eye has much better dynamic ability than any camera, which is why you can drop from an exposed trail in direct sunlight to gloomy forest singletrack and not struggle to see where you’re going.
A camera would struggle to capture all the detail of a scene in dappled light, with sharp drops of sunlight and deep shadows.
For a MTB action camera, dynamic range is crucial – not resolution. You don’t need the most pixels, but rather the best ones.