I know road bikes tend to have a trail measurement of about 60mm and MTB's often have trail measurements in the 70mm range. Pavement and singletrack are the extremes but what are your thoughts on trail measurements for gravel grinding and cyclo-cross? I'm assuming neither is done on terrain that would be considered "technical". Is road geometry too twitchy for gravel and hard packed dirt? Does MTB geometry provide too much stability for gravel and dirt? Is splitting the difference (ie, Cross Check's trails is 66mm) the answer?
I would be interested in hearing people's experience with a trail measurement that you liked on gravel/dirt and trail measurements you didn't like.