Try those wrister gloves I got 4 rides on em & my wrists are pain free. My right would get pain from riding or using it a lot at work. I used to swing a hammer for a living & my right is a bit weak. But with those gloves I never feel a thing.

wrist problems
 

glad it helps you LINK. Others should try too.

I know this is an old thread but i thought i would put my two pence worth in,

I started riding off road just over a year ago, when i first started my wrists used to really cripple me, it felt like the bones were rubbing together, for days after riding it was the same,
I had some boxing wraps and thought i would try them wrapping up right around my hand and wrist they worked a treat, I used them every ride for around six months then stopped, I have no trouble now,

I can only assume that my wrists became stronger.

Its a cheap option.

What is a boxing wrap?

Basically like a cloth tape which you wrap around your wrist and hand to help support your wrist and hand when boxing,They give heaps of support if wound correctly.
Cheers Mark

The only problem they do restrict movement a little,

Try ace elastic bandages. They work very well for me. I can wrap them as tight or loose as I want. They provide great wrist support without resticting range of movement.