05/05/2026
THE 1972 MERCKX HOUR RECORD - One of the most iconic performances in cycling history.
The ride itself
Distance: 30.715 miles in one hour
Location: Agustín Melgar Olympic Velodrome, Mexico City
Date: October 25, 1972
Conditions: High altitude, which helps aerodynamics but makes breathing much harder
Equipment (by today’s standards: brutally simple)
Steel Colnago bike (~12.68 lbs)
Traditional drop bars
Spoked wheels
No aero helmet, skinsuit optimization, or wind-tunnel design
Fixed gear: 52×14 (about 97 gear inches)
Why it stands out
Merckx was at the end of a grueling season—physically and mentally drained
He beat Ole Ritter’s previous mark by 0.48964 miles, a massive margin for an hour record
His pacing was famously relentless—he described it as one of the hardest efforts of his life
Legacy and impact
The record stood for 12 years, until Francesco Moser broke it in 1984 using disc wheels and aerodynamic innovations
That ride marked the beginning of the “technology arms race” in hour records
Eventually, Union Cycliste Internationale split records into:
“Best Human Effort” (anything goes)
“Hour Record” (Merckx-style traditional setup)
Even after rules were unified again in 2014, Merckx’s ride is still widely viewed as the purest benchmark of human power over technology
Bottom line
Merckx’s 30.715 mi isn’t just a number—it’s a reference point for what a rider can do with minimal technological advantage. Even today, when riders surpass it under modern rules, comparisons almost always circle back to that 1972 effort as the gold standard of “athlete-only” performance. Eddy Merckx is estimated to have produced approximately 450–485 watts to set his 1972 World Hour Record.
