Question

What are the distances in a triathlon?

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A triathlon is a swim, then a bike ride, then a run, completed in that order without a break — the clock runs through the transitions. There are several standard distances.

Super sprint — 400m swim, 10km bike, 2.5km run. Common entry point.

Sprint — 750m swim, 20km bike, 5km run.

Standard (Olympic) — 1.5km swim, 40km bike, 10km run. This is the distance raced at the Olympic Games.

Middle distance (Half Ironman, 70.3) — 1.9km swim, 90km bike, 21.1km run. The 70.3 refers to the total in miles.

Long distance (Ironman) — 3.8km swim, 180km bike, 42.2km run. The run is a full marathon, and it comes last.

The two changeovers are called transitions, T1 from swim to bike and T2 from bike to run, and they are timed as part of the race. Triathletes train for them specifically; minutes are routinely lost there.

Drafting — riding close behind another cyclist to save energy — is banned in most age-group racing, and races are set up with marshals to enforce it. Elite short-course racing generally allows it, which changes the tactics substantially.

The Ironman name is a trademark of one race organiser, which is why other events use long distance or full distance for the same distances.

The swim is usually open water, and wetsuit rules depend on water temperature, with an upper limit above which they are banned to prevent overheating.

A duathlon is run-bike-run, and an aquathlon is swim-run.

The swim is almost always the shortest leg by time as well as distance, and the bike the longest. A rough split for a standard-distance race is around 20 minutes swimming, an hour on the bike and 40 minutes running — which is why cycling ability tends to dominate results at that distance.

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