DateExpected
Mid September 2027
Based on past editions. We'll confirm when the organiser announces.
Venue
Plage de Chambon-sur-Lac, Lac Chambon, 63790 Chambon-sur-Lac
Chambon-sur-Lac, Puy-de-Dôme
Countdown
September
The middle road route at 100 km and 1,850 m. You share the opening miles with the others, then split off at Chastreix.
Key facts
01Shares the opening section with the other road courses
02Course branches off at Chastreix
Create a free training plan for the La Sancy Arc-en-Ciel by Laurent Brochard 100 km
7-day free trial, no card required
The course
The route
Chambon-sur-Lac
Distance100km
Total climb1,850m
StartElevation
0 kmDrag map to rotate100.9 km
Weather
Mid-September, Chambon-sur-Lac
21°CTypical high
10°CTypical low
1°CColdest in 20 years
33%Days with rain
Highs around 21°C and lows around 10°C, but it has dropped to 1°C. Rain on 33% of days.
NASA POWER data, 2006-2025, the week either side of race day
2025 results
Who finishes, and how
#RiderTimeAvg speed
01LEMEE Stephanie03:14:5330.8 km/h
02RITZ Isaline03:17:2330.4 km/h
03MAUZAT Stéphanie03:29:2528.7 km/h
35
Women finishers
4:27:10
Median time
22.5 km/h
Median speed
Women · 2025 results, as published by the organiser.
How fast could you finish?
Get a prediction based on your recent training
Organiser
OrganiserAssociation Arco-Iris Events
Websitelaurentbrochard.com
Instagram@sancy_arcenciel_by_lbrochard
Running since2024
Training
Training for the La Sancy Arc-en-Ciel by Laurent Brochard 100 km
We don't do generic plans. We combine deep knowledge of this race's demands with your recent training, then build a plan with you that progresses as you do.
Beina integrates directly with your existing tools to understand your current fitness, and synchronise your planned sessions.
Intervals.icuWhat a La Sancy Arc-en-Ciel by Laurent Brochard 100 km plan targets
Typical sessions
100 km with 1,850 m of climbing
Endurance and fatigue resistance over the full distance
Fuelling and pacing for the whole event
What your weeks look like
Typical sessions
Long endurance rides building toward the full distance
Threshold and sweet-spot work for sustained power
Sustained climbing repeats on real gradients
Group rides for drafting and bunch-riding skills
Not a generic schedule
Typical sessions
Built from your current fitness and the time you actually have
Adapts every week as Beina learns how you respond
Syncs your sessions straight to Garmin and Wahoo
One clear next session, never a wall of spreadsheet
Entries open now
Get your La Sancy Arc-en-Ciel by Laurent Brochard 100 km plan.
7-day free trial, no card required.
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