A duathlon is a multi-sport endurance race that follows a run-bike-run format with two timed transitions between disciplines. It is often described as a triathlon without the swim.

What are the standard duathlon distances?

The sprint distance is roughly a 5K run, 20K bike, and 5K run. The standard (sometimes called Olympic) duathlon is a 10K run, 40K bike, and 5K run. Some events also offer shorter beginner formats or longer endurance races, but distances vary by organizer.

What gear do I need for a duathlon?

Basic gear includes running shoes, a bike in good working condition, and a helmet (required for all cycling segments). Athletes often use a transition setup with a towel, nutrition, and hydration. Road bikes are most common, but hybrid bikes are acceptable for beginner-friendly events. Cycling-specific clothing is optional but helpful for the bike leg.

How do I train for a duathlon?

A typical sprint duathlon training block can range anywhere from 8 to 16 weeks depending on fitness level. Training includes separate running and cycling workouts, along with brick workouts (back-to-back bike and run sessions) to adapt your legs to running after cycling. The second run should be a key focus, as it typically feels significantly harder due to accumulated fatigue.

Duathlon

Getting Started with Duathlon

Run, bike, run — back to back, with two transitions in between. A duathlon is a triathlon without the swim, which makes it one of the most accessible doors into multi-sport racing.

The sprint distance — roughly a 5K run, 20K bike, and 5K run — is short enough to finish on your first attempt and a natural fit if you already run or ride. That second run on tired legs is where you realize how close you are to finishing.

Sprint distance

5K run · 20K bike · 5K run

Beginner finish time

90–120 minutes

Entry difficulty

Moderate

Recommended training

8–16 weeks

What race day feels like

A mass or wave start, straight into running. The opening run sets the tone, with many racers excited to get the show on the road. The bike is next, where the racing can be quiet in smaller events. The final run, where your legs feel unfamiliar, brings people back to the spectators, cowbells, and the finish line.

Best fit for

Runners who want into multi-sport without learning to swim, cyclists who can already run, and triathletes looking for an off-season race or a non-swim option. If you run or ride with any regularity, you're most of the way there.

What you need

Running shoes, a bike in good working order, and a helmet (required on every course). A road bike is most common, but most bikes work fine for a first sprint. Many racers bring water bottles on their bikes to hydrate during the race.

Recommended starting point

Sprint Duathlon

Usually a 5K run, 20K bike, and 5K run, although distances vary depending on the course. Short enough to finish without a huge training block, long enough to teach you transitions and what running on tired legs really feels like. The standard entry point into the sport.

Why start here

Duathlon asks two things a single-sport race doesn't: switching disciplines under the clock, and running well after a hard bike. The sprint distance is the cleanest place to learn both. Get the run-bike-run rhythm down here, and every longer multi-sport race builds on the same skill.

Popular Duathlon Formats

Popular Formats

Pick Your Format

Sprint

5K · 20K · 5K

Best starting point. The standard distance for getting into the sport.

Standard

10K · 40K · 5K

Double the run and bike. The step up once sprint feels manageable.

Preparation

Training Tips

Train the brick

The bike-to-run transition is the hardest part of a duathlon. Run immediately off the bike in training so your legs learn that heavy, unfamiliar feeling before race day instead of on it.

Pace the first run

Going out too quickly on the opening run is a common mistake. Adrenaline makes it easy to push it too hard early, and you will pay for it on the second run. Practice holding back early so you have legs left at the finish.

Coming Up

More Duathlon Races

Jun

25–28

Thu–Sun

Duathlon

Race in the Clouds - Alma Dirt Festival 2026

Alma Cemetery Meadow, Alma, CO

10K · Half Marathon · Under 10 mi · 10–20 mi · 20–30 mi · 30+ mi · Olympic

Avg 69° / 39°·10,357 ft city elevation

Avg 69° / 39°10,357 ft city elevation

Jun

25–27

Thu–Sun

Duathlon

Race in the Clouds - Alma Dirt Festival 2027

Alma Cemetery Meadow, Alma, CO

10K · Half Marathon · Under 10 mi · 10–20 mi · 20–30 mi · 30+ mi · Olympic

Avg 69° / 39°·10,357 ft city elevation

Avg 69° / 39°10,357 ft city elevation

Jun

Fri

Duathlon

Chutes & Ladders Bike & Run Duathlon

3233 Singing Hills Blvd, Sioux City, IA

Avg 85° / 60°·1,099 ft city elevation

Avg 85° / 60°1,099 ft city elevation

Jun

Sat

Duathlon

Tri Goddess Triathlon

11500 Seymour Rd., Grass Lake, MI

Sprint · 1000m · 1500m

Avg 82° / 59°·992 ft city elevation

Avg 82° / 59°992 ft city elevation

View more duathlon races →

Frequently Asked Questions (FAQs)

What is a duathlon?: A duathlon is a multi-sport endurance race that follows a run-bike-run format with two timed transitions between disciplines. It is often described as a triathlon without the swim.
What are the standard duathlon distances?: The sprint distance is roughly a 5K run, 20K bike, and 5K run. The standard (sometimes called Olympic) duathlon is a 10K run, 40K bike, and 5K run. Some events also offer shorter beginner formats or longer endurance races, but distances vary by organizer.
What gear do I need for a duathlon?: Basic gear includes running shoes, a bike in good working condition, and a helmet (required for all cycling segments). Athletes often use a transition setup with a towel, nutrition, and hydration. Road bikes are most common, but hybrid bikes are acceptable for beginner-friendly events. Cycling-specific clothing is optional but helpful for the bike leg.
How do I train for a duathlon?: A typical sprint duathlon training block can range anywhere from 8–16 weeks depending on fitness level. Training includes separate running and cycling workouts, along with brick workouts (back-to-back bike and run sessions) to adapt your legs to running after cycling. The second run should be a key focus, as it typically feels significantly harder due to accumulated fatigue.