I've adjusted the seat post up so that my leg is slightly bent when the pedal is at the bottom of the travel. When I ride for more than 30 minutes, my hands start to get numb. I still seem to be putting too much weight on my hands during the ride. Does anyone know if there is a way to move the handle bar further forward from the stock location? Does anyone make such a spacer? My bike is a mostly stock Giant Boulder SE with a 23-inch frame. Only mods so far have been knobbier tires and a spring loaded gel seat.