Question about average speeds

[Eden]

OK, this is truly a stupid question. But what is the steepest grade road a person can actually ride?

There is a street in Pittsburgh called Canton Ave. that's been unofficially measured at 37% There is a race there called the "Dirty Dozen", which is 12 hill climbs (climb hill get a time, ride to the next hill, climb hill, etc. etc.) and Canton is on the route. There is some tounge and cheek rhetoric about the race not continuing until all riders make it to the top of Canton Ave.(judges reserve the right to go temporarily blind....), but at very least the winner always does - so I guess you can do 37% if you are fit enough! There is a hill around here that comes in at 26% - the last time I tried that one I was lifting my front wheel off of the ground and had to get off. Sometime I need to get out and try that one again with my new bike.