flat bars did that to me on my commuter/utiliyt...more wrist than hand..........I got relief with cane creek ergo bar ends
http://www.jensonusa.com/store/produ...s.aspx?sc=FRGL
long term I switched to north style bars...but that was fiitting with my upright "english 3 speed" look/set up.
In the past on long commutes, i used road bike withh drop bars.
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Life is too short not to ride the best bike you have, as much as you can.