Quote Originally Posted by Trek420 View Post
Most posting 15 mph+ are on road bikes ...
The saddle to cranks geometry of a comfort bike is meant for ... comfort, not efficiency. The cranks are probably further forward than a road bike. This means you can't use gravity (your body weight) to help push the pedals.

Quote Originally Posted by Trek420 View Post
8 mph on dirt with a comfort bike?

You rock!
Ditto!