May B-day (59 now) 5'4" 190lbs. What I consider my normal ride is 16 mile round trip that is mostly hills. We have lots of wind here so my avg. speed varies a lot depending on wind direction & speed. If it is at my back on the return half of the ride, I tend to average a little higher speeds. my best so far this year has been 14mph with near perfect conditions (yesterday) -- 63* and 5mph east wind. I have experienced 20 to 25mph wind in my face at the end and averaged only 12mph. OH well, that's why I geared the bike for wind and hills instead of speed on flat ground in calm conditions.