I just upgraded several parts on my mountain bike. I got a new seat post and stem which has changed my position on the bike. I noticed that about twenty minutes into both rides this week that my hands (left one more so than the right) start to hurt terribly. It's almost like the muscles in my hands are cramping. I am trying to figure out what to change. My thoughts are:

1. Rotate the handlebars down slightly.

2. Get the bikeshop to put old stem back on.

3. Change seat height (I hate to do this because it helped make my pedaling better)

4. Change seat position forward back. (I hate to do this because I feel pretty comfortable on it as is.

Please if you have any advice or have had similar problem, post here. Thanks!!