I have a Cannondale F5 mountain bike that I really enjoy. I recently had back surgery, and when I returned to using my bike, I noticed that my lower back was in an uncomfortable position. In short, I think the current handlebar is too low for me. The guy at the dealer store is suggesting switching out the current one with this curvie one which would involve changing out all the component cables and such. I assume the performance of the bike could potentially change some; could anybody tell me if this would totally ruin the performance of the bike? or any feedback on changing the handlebar. Thanks!