On a ride longer than an hour, my left hand becomes numb (my right hand is fine no matter how long I ride). Is this so because of incorrect setup? It doens't feel like I'm holding on too tight, both my hands are always relaxed on the handlebars. One more thing, after rides of 2 hrs or more, my backside and nuts go numb. I've tried changing saddles, but still the same results. What do I do here, do I just have to spend more time in the saddle and get used to it or do I have to check my setup again. Had my bike professionally set up already. Very Confused ZuesZues