I get pins and needles in my hands after racing or during a long (1-2 hours) training ride)

Mine is caused by either;

- gripping the bars tight with no change in position (trying to chase down a break or in a TT where I only move at the turn-around)

- forgetting to shift my arms/hands for a long period of time (a flat training ride)

Usually I can fix it by shaking my hands out (like shaking water off my hand) but if i leave it too long, the sensation crawls up my arms and i can't really "shake" it til I stop riding...

I'm not too concerned by my "symptoms" - I know what causes it, and how to fix it.

There is something called handle-bar palsy and it might be worth doing a search here and in google for that - there is an easy-to-read article in the latest Bicycling Australia mag on handlebar palsy...