Join Date: Apr 2009
Location: Denver, CO
Bikes: 1981 Univega Viva Sport
I'm no expert on the matter but I've been there too. Here's how it all worked out for me:
I compressed the ulnar nerve in my left hand and ended up with a half numb hand for several days.
I took my bike to a LBS and one of the techs there went over everything with me. The handle bars were too low, not by the 'accepted standard' mind you, but in that I was putting way too much weight on my hands while riding. He suggested a good pair of riding gloves and a rewrap with some added padding (a couple extra strips of gel bar tape) strategically placed under some fresh gel handle bar tape.... he told me to forget the stem and bar that I was going to buy which would have made them a whole lot more money. Oh, and he suggested that I wasn't moving my hands around enough. Needless to say, that guy impressed me and definitely earned my respect.
I'm at about 250miles in the past month and I've only experienced a minor tingle after a couple 40 mile rides... I'm sure a little more tweaking will help sort that out.
Synopsis: For me it was a matter of raising my handlebar, adding some good padded gloves, re-wrapping and padding the bars, and getting in the habit of moving my hands around.
Keep in mind too that if the numbness shows back up after you make some adjustments it may be a matter of needing more time to heal and recover and doesn't necessarily mean that the changes you have made aren't going to help or aren't enough.