IRONMAN Thun Bike Course Analysis
Swiss Alps
Overall Surface Quality:
Great - Swiss roads are maintained annually
Strava rides of last year’s winners (or runner up):
Jan Van Berkel, (4:20:14 / 41.5 kph); https://www.strava.com/activities/5910240392
Strava Segment:
https://www.strava.com/segments/23105519
Significant Ascents:
Climb up from the lake (@ km 2.7 and 92)
- Climb has 2 parts, starting with 1km of 4.6% and ending with 2km of 4%
- Peaks at 6%
Roller after Uetendorf (@ km 15.9 and 105)
- 800 meter long hill breaking 8%
Roller into Kirchdorf (@ km 24.8 and 114)
- 500 meter long hill breaking 12%
Climb out of Toffen (@ km 41.8 and 130.6)
- Biggest climb in the course
Neuhaus Climb (@ km 54.7 and 144)
- Two steep <1km long sections hitting +6%; 185 meters gained in total
- Reaches highest elevation of the course, 896 meters
- Followed by a significant 8km long descent with technical sections (km 68)
Hauptstrasse Climb (@ km 70 and 160)
- Rolling sections of 4% and 5% scattered among false flats
- Last significant climb on the course (will do twice at the end of each lap)
Click here to view a full interactive profile of the 112 mile course.
Turn by Turn Course Recon:
*Turn angle is measured by the sharpest corner angle throughout the entire turn*
Click thumbnail for example (66˚ turn)
The bike course is winding with 52 turns per lap. There are only a few that are technical:
127˚ right turn @ km 17.6 and 106.9
Entrance gradient (preceding 100 meters): -6.9%
Exit gradient (next 100 meters): -2.1%
Google Street View
65˚ left turn @ km 20.4 and 125.8
Entrance gradient (preceding 100 meters): -4.8%
Exit gradient (next 100 meters): -2.3%
Google Street View
180˚ left turn @ km 26.5 and 109.8
Entrance gradient (preceding 100 meters): 2.4%
Exit gradient (next 100 meters): 2.5%
Google Street View
103˚ left turn @ km 54.3 and 143.7
Entrance gradient (preceding 100 meters): -2%
Exit gradient (next 100 meters): -0.4%
Google Street View
170˚ left turn @ km 64.4 and 153.8
Entrance gradient (preceding 100 meters): -9.2%
Exit gradient (next 100 meters): -2.5%
Google Street View
Double hairpins @ km 68 and 158
- Turn sequence averages -7.5%
- Preceded by 1km of -6% and -7% gradients
Google Street View Turn 1
Google Street View Turn 2
Transition Layout:
Obstacles and Other Notes:
Current / Historical Weather Patterns
Full Interactive Bike Course Profile
Link to main race site:
https://www.ironman.com/im-switzerland
Notice an error, have a suggestion, or an update to this information? Contact us at samlyons@pjammcycling.com!