Alright, let me start by saying that my mountain bike feels great when I ride, so I don't think this is a fitting issue.

When I ride for any length of time I've noticed that my hands start to get a tingley. Its normally nothing I can't fix by stretching out my hands and just setting the bottoms of my palms on the handlebars til my hands stop tingling.

Well, thats how I fix the right hand.

The left hand however will keep tingling, sometimes taking 2+ days to stop. This is particularly bad in the pinky and ring fingers, not so much the others. Worse, when I hit a significant bump, or something that causes the frame to jolt, I occasionally feel a shock run from my wrist up my arm. This is only in my left arm.

Any idea what's causing this? Any idea how it can be stopped?