bonj said:don't believe anyone who claims that their average is over 20mph. They're bullshitting. Either they're Lance Armstrong, or they live in a velodrome. What they mean is, they often glance at their speedo and it's saying their current speed is over 20mph. So while it could be possible at a push that their modal speed is 20mph, there's no way that the mean is that.
I've never been overtaken, and I average 12mph, on a road bike, but I overtake everyone else.
Judging by the speed these people do, I'd say the national average was less than 10mph.