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Me.
The average bike *racer* is much fitter than the average person who enters marathons or triathlons. Bike racing isn't inviting for people who aren't in very good shape. If you get dropped from the lead pack it's not fun.
The average marathoner if fitter than the average cyclist and triathlete. The average cyclist just goes for weekend rides bike rides on the bike path. The average triathlete does a few short races per year, and not very fast. At least marathoners are in shape to run a marathon
On top level:
6 watt/kg at lactate threshold for trained cyclists = 60 minute half marathon for trained runners.
How do i calculate: the average professional has an efficiency of 85 watt per 1000 ml oxygen. Now take a 165 pound rider what is very average in tour de france time trialists.
75 kilogram x 6 watt = 450 watt
oxygen requirement per minute would be about 5294 ml
This gives a working vo2 of 70.2 ml/kg/min.
A professional runner will require 200 ml of oxygen per kilometer ran. At 21.1 km hour you run a kilometer in about 2.84 minutes.
200 / 2.84 = 70.4 ml/kg/min
All cyclists pushing over 6 watt/kg at lactate threshold are equivalent fit to 1 hour half marathoners.
As far as i can see there are more cyclists pushing the 6 watt/kg then i can see runners go under 1 hour.
Part is because cyclists can train for hours a day.
Triathletes.
Since a triathlete is a cyclist, marathon runner, and a swimmer, this looks like a trick question.
I thought Lukas Verzbicas' performances would have ended this debate.
Define "fit."