While cruising through this forum I've seen a lot of folks talking and doing changes to the front and rear gearing on the bike by replacing the 14T with a 13T and sometimes changing the rear of the bike to a 45T or 46 from the stock 44T. I found a website that shows the impact to speed and torque by making these changes along with what you will have to do with a chain. Pretty nice!
http://sprocketcalculator.com/