Join Date: Jul 2005
Bikes: 1984 Trek 520; 1990s Peugeot (Canadian-made) rigid mountain bike; 2007 Bike Friday NWT; misc others
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It's possible you've moved your seat the wrong way. One problem with moving your seat forward is that it moves your centre of gravity in front of your feet, causing you to tip forward off your seat onto your hands, putting too much weight on them. It's like a guy bowing forward at the waist without letting his butt move backwards to counterbalance - he'll fall on his face.
Try raising the handlebars, and moving your seat back to where it should be. The classic advice on seat position is that the front of your knee should be directly above the centre of the pedal when your foot is in the farthest forward position, but Sheldon Brown
says recreational riders can move their seat a bit farther back, and should move their handlebars up and/or back to go along with it. As others have said, you may need a shorter stem, but try just raising the handlebars first, if you can.