Quoted post said:wouldn't gearing impact this too? I ride a CX bike and I know it is geared differently than true road bike. My road rides are typically 13-15mph over 15-25 miles with highs in the 20s. When I've ridden with others on true road bikes, they can cruise at a higher MPH than I can, even though our fitness levels are similar.
Yeah, gearing will affect your maximum speed. If your bike has lower gear ratios then you won't be able to go as fast. Also, does your CX bike have different tires? I don't know too much about CX bikes but sometimes I see people have knobbier tires than those with road bikes. Knobby tires are slower on paved roads.
Quoted post said:For staying fit, I now average 19 mph on a 36 mile ride that I do every couple of days. Fairly windy area, particularly this time of year (by Lake Michigan, IL, USA).
What are others' averages, since we are on the subject?
It depends on the terrain, wind, and course. On flat terrain I usually go somewhere between 17-20 on my training rides. For something like hill repeats I go down as low as 12 mph...
In terms of fitness I really wouldn't worry about the particular number of the average speed. You should really be focusing more on the improvement over time as a gauge of fitness. For example, if you start out on a course at 14 mph and ride that course regularly, you will notice that you will get faster on that same course gradually over time. Conditions such as wind and traffic, etc., can alter your speed so you won't always go faster each time, but in the long run you will probably see that after several months you've been riding faster than before.