"Ken Bessler" wrote in
:
Herin lies the problem - I'm running out of gear - I mean
on a slight downhill or with a tailwind I top out at
about 23-25 mph and I feel like I need more gearing.
I'm in 10th gear and peddaling like mad and my legs
feel like I'm in 5th gear or so.

Learn to pedal faster and more smoothly. A 52-13 gear is pleanty fast enough
to get you up to 40mph if you pedal at a good cadence. Serious recreational
riders should be able to get up to 200 rpm for short sprints. Even pro
racers use only slightly faster gears than what you have (maybe 1 more tooth
in front and 1 less in back).