Triathlon - What was I thinking....

"A triathlon is an endurance sports event consisting of swimming, cycling and running over various distances. "

Standard race distances
The International Triathlon Union (ITU) accepts a 5% margin of error in the cycle and run course distances.

Name: Sprint
Swim: 750 m(0.5 mi)
Bicycle: 20 km(12.4 mi)
Run: 5 km(3.1 mi)
Notes: A 500 m swim is also common. The Sprint Distance is the fastest growing triathlon race distance in the United States

Name: Olympic
Swim: 1.5 km(0.93 mi)
Bicycle: 40 km(24.8 mi)
Run: 10 km(6.2 mi)
Notes: Also known as "international distance", "standard course", or "short course".

Name: Full
Swim: 3.8 km(2.4 mi)
Bicycle: 180 km(112 mi)
Run: 42.2 km(26.2 mi) marathon
Notes: Also known as "long distance" or "Ironman triathlon".[2]

The Chicago Triathlon is an Olympic standard.