Ironman Switzerland Thun: the bike course and how to prepare it
- Distance
- 179 km
- Climbing
- 2,088 m
- Highest point
- 901 m
- Categorised climbs
- 18 · up to 11 %
- Shape
- Loop
Measured on the course you ride in Cycloscape. The organiser's own figures are below.
Elevation profile
519–901 m · 18 categorised climbsThe 6 biggest of 18 categorised climbs, in the order you ride them.
Ironman Switzerland Thun is a full-distance IRONMAN triathlon — 3.8 km swim, 180 km bike, 42.2 km run — in Thun, Switzerland. The next edition is on 4 July 2027, according to IRONMAN. From Thun, on the lake below the Bernese Alps, the bike leg climbs repeatedly through the hills of the Bernese Oberland; our reconstruction climbs to about 900 m.
Ironman Switzerland Thun at a glance
- Where
- Thun, Switzerland
- Official race page
- ironman.com ↗
- Next edition
- 4 July 2027
- Distances
- 3.8 km swim · 180 km bike · 42.2 km run
- Bike course
- 180 km
- Terrain
- Hilly — repeated climbs
- Facts checked
- 5 November 2026, against the sources below
Full preparation and course training require Event Coach Pro.
Ride the real course on your trainer. The route of Ironman Switzerland Thun, 179 km, as a 3D world, with your trainer following its gradients — any day, and as part of your Event Coach plan. Part of Cycloscape Pro.
The bike course
Ironman Switzerland Thun is a full-distance triathlon: 3.8 km swim, 180 km bike, 42.2 km run.
| Leg | Distance | Climbing |
|---|---|---|
| Bike leg | 180 km | — |
What the bike leg asks of you
Repeated climbs and descents: pace the first lap gently.
How to prepare the bike leg
The general shape of a good bike preparation, which Event Coach turns into a plan for your fitness, time and date:
- Train long, steady power: the 180 km of Ironman Switzerland Thun are ridden well below threshold — most age-groupers hold around two-thirds to three-quarters of their FTP — so the marathon is still possible.
- Ride your long sessions in the position you will race in, and practise eating and drinking on the bike: on race day you fuel the run on the bike.
- Add short runs straight after some long rides (brick sessions), planned around your bike training — Event Coach prepares the bike; your swim and run are yours to fit around it.
Pacing mistakes to avoid
The mistakes that cost triathletes the most on the bike:
- Riding the first hour of Ironman Switzerland Thun on adrenaline: the watts you spend early come back as minutes lost on the run.
- Surging on every hill and every overtake instead of holding an even power.
- Under-eating on the bike: the energy for the run has to go in before you get off it.
Prepare the bike leg of Ironman Switzerland Thun with Cycloscape
Tell Event Coach you are racing Ironman Switzerland Thun and it builds the bike side of your preparation towards 4 July 2027: structured workouts held by your trainer in ERG, pacing for the course and Performance Lab to see whether the work is landing. Swimming and running are not part of the plan. Full preparation and course training require Event Coach Pro.
Frequently asked
When is Ironman Switzerland Thun 2027?
On Sunday, 4 July 2027, according to the organiser.
How long is the bike course of Ironman Switzerland Thun?
180 km. The bike leg as IRONMAN describes its course.
Does Event Coach plan my swimming and running?
No. It prepares the bike leg — workouts, pacing and the course — and tells you where to fit short runs after long rides. Plan your swim and run with your own coach or programme.
Can I ride the bike course of Ironman Switzerland Thun in Cycloscape?
Yes, inside Event Coach with Cycloscape Pro: the bike course is ridden on your trainer as part of your preparation. It is never a free or standalone ride.