Sound advice from all. While the vibrations might be one concern, it would seem that a fall with a blow to the helmet could be a real problem. Most of the gravel we do is on fairly hilly routes with steep twisty descents. For me, I’d be so concerned about falling it would take most of the enjoyment out of riding. I could even see myself toppling over from riding so conservatively versus just letting the bike roll over the rough stuff. Just my two cents.
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Ride your Ride!!