Originally Posted by
Bassmanbob
At what age did you have to start decreasing your endurance riding distances?
Indeterminate, and it's certainly well beyond 70.
The 70+ 4-man team completed Race Across America at an average just over 19 mph. That's 19 mph over abut 3000 miles.
They rode in a relay of 2 riders each, so each rider completed about 1500 miles, or ~230 miles every day.