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Triathlon and Duathlon
What Are Triathlon and Duathlon?
Triathlon and duathlon belong to the multisport disciplines, in which running and cycling – plus swimming in triathlon – are combined into an overall ranking. For cyclists, this family of disciplines is particularly exciting because the cycling segment often accounts for more than half of the total time, making it the biggest lever for placements.
While classic road races take place exclusively on the bike and are regulated by the UCI, triathlon and duathlon fall under the jurisdiction of World Triathlon (formerly ITU). The rules differ significantly from professional cycling – particularly regarding drafting, equipment choices, and transitions between disciplines.
Triathlon: The Classic Triple Combination
In triathlon, athletes follow three disciplines in a fixed order:
- Swimming – open water or pool
- Cycling – road or closed course
- Running – usually on asphalt or trails
Total time starts with the start signal and only ends at the finish of the run. Every second in the transition zone counts – a difference that pure cyclists often underestimate.
Duathlon: Running and Cycling Without Swimming
Duathlon combines running and cycling, typically in the sequence Run – Bike – Run. For cyclists who avoid swimming or train in cooler regions, duathlon is an attractive entry-level discipline. The cycling courses and rules closely follow triathlon, which is why both sports are covered together here.
Triathlon sequence: Swim → Transition zone Swim-to-Bike Transition → Bike → Transition zone T2 → Run. The bike segment is typically the longest time block (approx. 50–60% of total time), swimming approx. 10–20%, running approx. 25–35%.
The Most Important Race Distances
Triathlon and duathlon are contested over various standard distances. The cycling course length varies considerably – from sprint to Ironman.
Important: At Olympic distance, the 40 km bike course is roughly equivalent to a short time trial in road cycling – however with fresh legs after the swim and a subsequent run that already preloads the legs.
The Cycling Segment: Heart of Multisport
Why Cycling Determines the Outcome
In triathlon, a simple rule of thumb applies: whoever gains time on the bike has a good chance of a top placement – provided the run legs hold up. Pros like Jan Frodeno, Kristian Blummenfelt, or German Olympic champion Laura Lindemann invest enormous training volume in bike preparation.
The cycling phase differs from a classic road race in several ways:
- Preloaded legs: After swimming, leg freshness is missing; pacing is crucial
- No peloton like in the Tour: In non-drafting races, everyone rides for themselves
- Run afterwards: Too aggressive cycling can ruin the marathon or 10 km run
- Transition zones: Fast transitions save measurable seconds
Drafting vs. Non-Drafting
One of the most important distinctions in triathlon cycling is the drafting rule:
Drafting-legal (ITU format / Olympic style):
- Drafting in the bike field is allowed
- Distance rules apply (typically 10–12 m to the rider ahead)
- Tactics similar to a road time trial in a peloton
- Pros often ride in national teams or training groups
Non-drafting (age group / Ironman style):
- Drafting is prohibited
- Minimum distance of usually 10–12 m (depending on the organizer)
- Violations lead to time penalties or disqualification
- Each athlete effectively rides an individual Einzelzeitfahren
Equipment: From Road Bike to Triathlon Bike
Triathlon Bike vs. Classic Road Bike
Triathletes often use specialized time trial bikes with Auflieger, steep seat angle, and aerodynamic integration. In drafting races, equipment restrictions apply that are similar to a normal road bike.
Transition Zone Equipment
In the transition areas (T1 and T2), every second counts. Experienced triathletes prepare their equipment meticulously:
- Bike secured in place – saddle at optimal height, running shoes on pedal or on transition mat
- Helmet buckled – put on before leaving the zone, otherwise disqualification
- Race number – on the back of the saddle or on the tri suit, depending on regulations
- Bottles and nutrition – on the bike, not collected in the transition zone
Tip: Practice transitions at race pace: A practiced T1 transition takes under 60 seconds for pros; amateurs should aim for under 2 minutes.
Tactics and Pacing on the Bike
Power Management with FTP
Triathletes rely heavily on Functional Threshold Power (FTP) when cycling. An FTP test forms the basis for race tactics:
- Sprint/Olympic: 90–105% FTP on the bike, short peaks possible
- Half distance: 75–85% FTP, even pacing
- Ironman: 65–75% FTP, a conservative start pays off
Common Tactical Mistakes
Many cyclists coming from road racing make typical mistakes:
- Too hard in the first kilometers – ruins legs for the run
- Too much energy on climbs – without mountain classification points, all-out effort is not worth it
- Underestimated aerodynamics – in non-drafting, 70–80% of power goes against air resistance
- Poor nutrition – 60–90 g carbohydrates per hour needed on long distances
- Ignored transition zones – free time is wasted
Time shares Ironman (approx.): Bike approx. 50% of total time · Run approx. 35% · Swim approx. 10% · Transition zones approx. 5%. The cycling segment is thus the largest single block and the most important lever for overall placement.
Training for the Cycling Segment
Periodization for Triathletes
Triathletes must coordinate three disciplines. The cycling share in training is typically 40–50% of total volume:
- Base phase: long zone 2 rides, indoor training, strength endurance
- Build phase: sweet spot, brick workouts, race simulations
- Race phase: race-specific intervals, tapering, transition zone technique
Brick Training: The Key to Success
Brick workouts (bike immediately followed by run) simulate the heavy legs after the cycling phase. Typical sessions:
- 60–90 min bike at race pace + 15–20 min run
- 3 × 20 min bike (threshold) + 3 × 5 min run
- Ironman simulation: 3–4 h bike + 30 min run
Brick training sequence:
- Warm-up bike (15 min)
- Main set bike (60–120 min)
- Fast transition (< 2 min) – critical changeover
- Run main set (15–30 min)
- Cool-down
- Recovery and nutrition
Famous Races and Their Bike Profiles
The Olympic triathlon distance (40 km bike) is contested on technical courses in drafting format – Paris 2024 showed tight field racing with corners and short climbs. At Ironman and the Challenge family, non-drafting time trials dominate on windy, rolling courses; Hawaii is legendary for heat and the Hawi wind. The Powerman Duathlon in Zofingen is considered the world championship of duathletes with a demanding bike course and extremely fast run segments.
Differences from Classic Cycling
For cyclists who want to switch to multisport, these points are decisive:
Warning: UCI pros may not simply start at triathlon races unless they are on the UCI clearance list. Observe contract and license rules!
Checklist: Preparing for Your First Triathlon
- Complete an FTP test and define training zones
- Equipment check: helmet, tri suit, cycling shoes, bottle cages
- Practice transition zone at home (shoes, helmet, tri suit)
- Complete at least 3 brick workouts
- Test nutrition strategy on the bike course
- Course reconnaissance or virtual preparation
- Read organizer's rulebook (drafting yes/no)
- Plan T1 and T2 setup the day before
FAQ: Common Questions About the Cycling Segment
FAQ
Q: Do I need a time trial bike?
A: For non-drafting races yes; for drafting races a road bike with clip-on aerobars is often sufficient.
Q: How important is bike vs. run?
A: The cycling segment offers the biggest time lever – typically 50–60% of total time.
Q: Can I combine it with cycling?
A: Yes, with adapted periodization, road racing and triathlon can be combined.
Q: Ironman bike goal for beginners?
A: Under 6 hours for 180 km is considered a solid age group goal.
Q: Duathlon vs. brick training?
A: Duathlon is the race; brick training is the specific training session (bike plus run directly back to back).
Related Topics
- Individual Time Trial – The closest relative to non-drafting triathlon cycling
- Time Trial Bikes – Equipment and aerodynamics in multisport
- Drafting – Tactics in drafting-legal triathlon races
- FTP Test – Performance diagnostics for triathlon pacing
- Road Racing – Differences from the classic cycling race