DateExpected
Late May 2027
Based on past editions. We'll confirm when the organiser announces.
Venue
Complexe Sportif Polyvalent, Savenay
Savenay, Loire-Atlantique
Countdown
May
The classic century on the Les ROC'H du Sillon menu: 100 km with 1,800 m of climbing, a solid day out that is steady rather than savage.
Key facts
01Non-competitive randonnée: leave any time between 06:30 and 08:30
02Course closes at 18:00, so start early and keep moving
03Helmet and a maintained MTB are mandatory; ID needed at registration
Create a free training plan for the Les ROC'H du Sillon 100 km
7-day free trial, no card required
The course
The route
Savenay
Distance100km
Total climb1,800m
StartElevation
0 kmDrag map to rotate80.2 km
Weather
Late-May, Savenay
21°CTypical high
11°CTypical low
4°CColdest in 20 years
32%Days with rain
Highs around 21°C and lows around 11°C, but it has dropped to 4°C. Rain on 32% of days.
NASA POWER data, 2006-2025, the week either side of race day
Organiser
OrganiserAssociation Les Run du Sillon, with clubs from Savenay, La Chapelle-Launay, Malville, Cordemais and Fay-de-Bretagne
Websitelesrundusillon.com
Running since2012
Training
Training for the Les ROC'H du Sillon 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 Les ROC'H du Sillon 100 km plan targets
Typical sessions
100 km with 1,800 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
Terrain and skills practice specific to the course
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 Les ROC'H du Sillon 100 km plan.
7-day free trial, no card required.
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