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Pinned, what happened to your shoulder/arm? it sounds like me but my numbness is from a blown disc in my neck. blew two discs out a few years ago and the neck one still numbs out my arm and fingers on occasion. only mention in case you don't know what the shoulder/arm pain is from. mine took MRIs to figure out. started in shoulder first.
the other disc was lower causing leg pain. that's why i stopped hitting the MX tracks more regularly. we used to do Crow Hill almost every weekend. woods riding doesn't bother either disc, thankfully. (i do want a lighter helmet though, Airoh)