1-8 May 2027
Start / Finish Lac de Trémelin (Brittany, France)
+/-
1300 km
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20 000M de D+
Off-road
ultra-distance
The Gravel Tro Breizh is Brittany’s pioneering, fully self-supported, off-road ultra-distance event. Since 2018, this extraordinary adventure has challenged passionate riders to push their physical and mental limits, all while immersing themselves in Brittany’s wildest and most secret landscapes. For this historic 10th anniversary edition, get ready for an unforgettable journey that stays true to its roots: pure granite, ultimate self-surpassing, and an incredible human experience.
Gravel Tro Breizh : Heading Towards the 10th Edition of a 100% Breton Legend
Since 2018, Brittany has been the stage for an extraordinary ritual. In 2027, the Gravel Tro Breizh is preparing to celebrate its historic 10th edition—a major milestone that will welcome a new wave of adventurers into its legend. Gathering from all over France and far beyond its borders, cyclists will once again meet at the gates of the mythical Brocéliande forest.
The challenge remains unchanged, carved in stone: set out to discover a raw Brittany, its wild landscapes, and its timeless tales, while braving the hidden paths, trails, and secret roads of this land of character.
Under the ruthless gaze of the Ankou, the absolute master of these moors, only the bravest will conquer this memorable 1300 km journey. It will take extraordinary courage to dare to sign up, stand on the starting line, and challenge these legendary lands. Taking that step to register is already completing half the journey toward an adventure that will leave its mark on you forever.
In 2027, will you be among those who write the tenth chapter of the mythical and legendary Gravel Tro Breizh!?
2027 Edition – May 1st to May 8th
Come and test yourself against this monument of ultra-distance cycling.
Keep in mind that the Gravel Tro Breizh is an off-road adventure lived in absolute autonomy (fully self-supported).
To tackle this route, your choice of bike will be crucial: gravel, monstercross, or mountain bike—the choice is yours based on your physical and technical skills. If you choose a traditional gravel bike, beware: narrow tire clearances could become a serious handicap in the most fun and technical sections. We can never say it enough: the Gravel Tro Breizh is not designed solely for smooth roads and easy paths!
The Challenge in Figures: 1,300 km / 180 hours
The event offers a colossal challenge of around 1,300 km, to be completed within a relatively tight time limit of 180 hours (which means 7 days and 12 hours). To have a chance at conquering this journey and finishing on time, you will need to maintain an average of at least 165 km per day.
Even though the Gravel Tro Breizh remains a non-competitive event, such a feat cannot be improvised. Finishing this route demands excellent physical conditioning and the ability to push through incredibly long days in the saddle. The adventure awaits—get ready to push your limits.
A Balanced Route in the Heart of Breton Diversity
The route is meticulously designed to offer the best possible balance, skillfully alternating between fast-rolling sections and more demanding segments. This rhythm is closely tied to Brittany’s geography: the terrain naturally gets tougher and hillier inland and in Central Brittany, while areas like southern Morbihan offer a gentler profile.
To guarantee you the ultimate adventure, the route takes these unique geographical and economic features into account. Rest assured, the ratio of fast-rolling tracks, easy paths, and quiet country roads remains higher than the purely playful or rugged sections.
Furthermore, the route is completely redrawn every year to let you explore the infinite richness and variety of the Breton landscapes. Edition after edition, participants praise the quality of this route, widely recognized for being perfectly balanced and offering the most beautiful immersion into Breton Land.
The Golden Rule: Absolute Self-Sufficiency
And of course, it can never be repeated enough: the Gravel Tro Breizh is a fully self-supported event. You must rely on yourself and yourself alone. Any outside assistance—whether it comes from friends and family or from pre-planned mutual aid between competitors—is strictly forbidden! Alone against your route and the elements: that is how true legends are written.
Core Principles of the Gravel Tro Breizh:
- Bikepacking
- Ultra-distance
- Unsupported (Self-supported)
- Non-competitive
- Non-stop progression
- Live tracking
The Gravel Tro Breizh is a non-stop progression event. Participants are entirely free to manage their rest and sleep periods as they see fit.
Bikepacking:
Driven by a quest for autonomy and lightness, minimalist gear allows any bike to be fitted with bags (handlebar bag, saddle bag, frame bag, etc.) attached with straps directly to the frame or components, eliminating the need for traditional racks. The goal is to carry only the strict essentials to remain as light as possible and cover long distances more easily.
Unsupported:
No assistance of any kind is allowed. Participants must be fully self-sufficient; neither the organization, family, nor friends can provide any help. It is strictly forbidden for participants to stop or sleep at the homes of friends or family members.
Participants must be completely autonomous regarding:
- Lodging and accommodation,
- Food and resupply,
- Mechanical issues and repairs…
Here is a document outlining these rules. In the event of an infraction, the rider will be disqualified. Even though this is not a race, the rules are in place to maintain fairness among all participants. Penalties up to disqualification from the event will be applied in case of non-compliance with the regulations.
Looking for a more accessible challenge on the same dates ? The GTB Series Spring Edition is made for you!
A Secret Route, Surprises, and Brand-New Sectors for the 10th Edition!
For this historic 10th edition in 2027, we have prepared a route packed with surprises and completely unridden sectors. But don’t expect us to reveal the secret just yet! True to the spirit of the event, we want to preserve the mystery and the thrill of adventure for as long as possible.
Since 2021, the peaceful and green setting of Lake Trémelin has welcomed us to kick off the event and celebrate the returns from this roughly 1,300 km journey. A true haven of peace in the heart of nature, it is the perfect place to focus before the grand depart and unwind after the effort.
At Erminig, we make it a point of honor to polish and refine the route down to the smallest detail through numerous field-scouting rides to deliver a flawless experience.
This is also why—and to guarantee total immersion and a true taste of the unknown—the GPS tracks are only sent out to participants one week before the start. Prepare for the unexpected: the 10th edition is going to surprise you!
What to expect from the route?
The Gravel Tro Breizh is a monument of fully self-supported, off-road ultra-distance cycling. While you are completely free to choose your bike (gravel, monstercross, or mountain bike) based on your physical and technical skills, here is what actually awaits you out on the terrain :
1. A Mostly Accessible Yet Rhythmic Profile
The route offers a vast majority of tracks, fast-rolling paths, and quiet asphalt roads that are perfectly accessible with proper training. However, certain portions of the course feature slightly more playful or technical sections depending on your skill level. Rest assured: these zones are never very long, and their inclusion is always justified to lead you to a unique viewpoint or a must-see passage!
2. Brittany is Far From Flat!
Do not underestimate the Breton terrain. In certain sectors, you should expect pronounced elevation changes, marked by short but sometimes very steep climbs. A valuable piece of advice: make sure to adapt your gear ratio (your development) beforehand, especially since your bike will be weighed down with your bivouac and self-sufficiency gear!
3. A Closer Look at the Elevation: What are we talking about?
The total elevation gain is always announced as an approximation, as no calculation method can define it with absolute precision. To help you find your bearings in Brittany, keep these benchmarks in mind:
- Overall average: generally sits around 1,500 to 2,000 m of D+ per 100 km.
- “Flat” zones (coastline, etc.): around 1,000 m of D+ per 100 km.
- Rugged zones (Central Brittany): up to 2,500 m of D+ per 100 km.
A Perfect Balance for Adventure
No matter the terrain, the reputation of the Gravel Tro Breizh rests on its ideal balance. The route is thought out as a whole to intelligently alternate between physically demanding sections and recovery zones, as well as off-road segments that are sometimes fast-rolling and sometimes more playful. It is up to you to manage your effort to make it to the end of the legend!
💡 Looking for a more accessible route? The GTB Series – Spring Edition is made for you!
A Guide & Regulations: Your Roadmap
To ensure your adventure goes as smoothly as possible, a key reference document is made available to you as soon as registrations open:
- The Participant’s Guide: To be downloaded and read carefully right here.
This essential guide contains the complete Official Rules and Regulations of the event, as well as all the practical, logistical, and technical information indispensable for approaching the Gravel Tro Breizh with peace of mind.
- A living document: This guide is regularly updated by the organization to reflect real-world terrain conditions and the specific needs of the 2027 edition.
- Your responsibility: It must be read with the utmost attention before you register, and must imperatively be re-read before the grand depart and after every new update.
⚠️ Important Reminder: Validating your registration implies the unreserved acceptance of the rules and this guide. You are preparing to challenge a legend—make sure you know its rules!
The Route Guide & GPS Tracks: The Countdown is On !
An essential companion to the Official Guide, the Route Guide is the strategic document that every single one of you will be eagerly waiting for.
To preserve the mystery and spice up the adventure, this guide—along with the final GPX tracks—will only be revealed and sent out on the weekend of April 24th and 25th, 2027.
This ultra-comprehensive document will serve as the true roadmap for every Adventurer. It will gather all the crucial, last-minute information you need:
- The Checkpoints (CPs): Exact locations and opening/closing times.
- Live Tracking: Detailed user manual, activation steps, and rules for using the GPS trackers (beacons).
- Route Logistics: Practical navigation info and tips to help you tackle the course in the best possible way.
Until then, sharpen your legs, prep your bike… the thrilling chill of the unknown begins the moment you receive this guide!
Official Rules Excerpt
To keep the adventure fair, safe, and true to its core values, every participant commits to respecting strict rules. The complete set of regulations can be found in the Participant’s Guide.
🌲 The Spirit of the Event: Non-Competitive but Demanding
- No stopwatch, no podium: The Gravel Tro Breizh is not a race; it is a non-competitive event.
- Zero selection process: No resume review, no lottery. The registration operates strictly on a “first-come, first-served” basis.
- The complete route: Participants must cover the entirety of the official route, without any shortcuts or route-cutting.
🎒 The Golden Rule: Absolute Self-Sufficiency (Solo Only)
- Your own ride, your own destiny: Registrations are strictly individual (there is no DUO category). The Gravel Tro Breizh is a solo adventure: sharing equipment between participants is forbidden.
- A true nomad’s life: To respect the spirit of adventure and adapt to unpredictable factors (weather, mechanicals, physical state), it is formally forbidden to book your accommodations before the start. Once the event is underway, you are completely free to book wherever you like.
- What is allowed: The only valid forms of assistance are commercial services that you find on your own along the route (shops, restaurants, hotels, bakeries, etc.).
- What is forbidden: Any assistance from relatives, family, friends, or acquaintances is strictly prohibited.
- Neutral Checkpoints: Due to the wild nature of this adventure, the volunteers stationed at checkpoints (CPs) are not authorized to assist you. You must manage everything yourself: lodging, food, mechanical trouble, or physical issues.
🛑 Entry Requirements & Required Profile
- Age requirement: You must be at least 18 years old at the time of the start. Minors, even if accompanied by an adult or parent, are not accepted.
- Medical fitness: You must be medically fit to practice ultra-distance cycling. No medical certificate will be requested; you are fully responsible for your own health. We strongly advise you to undergo a medical check-up or a stress test beforehand.
- 100% Muscle: Electric bikes (E-bikes) are strictly forbidden.
🦺 Mandatory Safety Gear
- Wearing a helmet is mandatory at all times.
- Wearing a high-visibility safety vest is mandatory from dusk until dawn, or whenever visibility is poor (fog, heavy rain).
- Your bike must be equipped with fixed and powerful lighting: white at the front, red at the rear.
⚠️ Penalties: In the event of non-compliance with these rules—and particularly in the case of cheating regarding outside assistance—the organization will apply time penalties up to immediate disqualification.
The Event Agreement
In addition to the guide and the regulations, participation in the event is governed by an official agreement binding the organization and each participant.
👉 Download the Official Agreement – Gravel Tro Breizh 2027
The Golden Rule: The “Self-Supported” Spirit
By validating your registration for the Gravel Tro Breizh, you sign a pact with the organization, but also with all the other participants: to scrupulously respect the “self-supported” rule.
Fairness at the Heart of the Adventure Although the Gravel Tro Breizh is not a timed race, strict rules guarantee that all adventurers face the elements on a perfectly equal footing. It would be unfair for inequalities to develop over the kilometers due to non-compliance with these core principles.
We deeply believe that our community is driven by a spirit of loyalty, integrity, and respect for the regulations. This is why the event management always favors a flexible, human, and accommodating approach.
A Firm Commitment To ensure the boundaries of the challenge remain clear for everyone, we provide a reference document detailing the main prohibitions related to this concept of absolute autonomy.
👉 Consult the official document: Reminder of the “Self-Supported” Rules
⚠️ Important Reminder: The organization will not tolerate cheating. Time penalties, up to definitive disqualification from the event, will be applied to anyone failing to respect these clauses. By registering, you commit to pushing your limits by your own means!
Participation Conditions & Registration Procedure
Do you feel ready to take on the challenge and enter the legend of this historic 10th edition? Here are all the requirements and the procedure to follow to secure your spot for the Gravel Tro Breizh, taking place from May 1st to May 8th, 2027.
Event Identity Card: What to Know Before Registering
- Before clicking that registration button, make sure you check all the boxes of this adventurer profile:
- Age Requirement: 🔞 18+ years old (Event strictly forbidden to minors, even if accompanied).
- Health: 💪 Medical fitness is essential for ultra-distance cycling (high-endurance capacity).
- Format: 👤 Solo only (No duos, no equipment sharing).
- Cap: 🎟️ 100 spots available in total, not one more.
- Selection: ⏱️ Registration race: First come, first served!
- Time Limit: ⌛ 180 hours maximum (7 days and 12 hours) to complete the route.
The registration fee is 195 euros and includes:
🎁 The “Degemer Mat Bag” (Your Welcome Pack)
An exclusive pack handed out during check-in, which includes:
- 2 bio-compostable TACX water bottles, customized with the colors of the Gravel Tro Breizh.
- 1 collector cycling cap from the 2027 event (register early to get your first name or nickname personalized on the visor).
- The official Road Book of the event, essential for validating your hard-earned passages at the various Checkpoints (CPs).
🛠️ Logistics & Safety
- The loan of a MadCap GPS tracker: An autonomous beacon to ensure your safety and allow your loved ones to follow your progress live online via a dedicated application.
- The final GPS track: The precise route file to upload to your GPS bike computer or smartphone.
🤝 Hospitality & Amenities
- Pre-race event: The official pre-start briefing, followed by a friendly drinks reception to meet the community.
- Finish-line welcome at Lake Trémelin: Access to showers to freshen up, alongside a well-deserved meal/snack to celebrate your finisher status.
- The Erminig Organization: The entire logistical infrastructure, the supportive presence of our volunteers on the ground, and the deployment of a dedicated media team to capture your adventure for prosperity.
Before Validating Your Registration: The 4 Commandments
Do not jump in blindly! The Gravel Tro Breizh is an extraordinary adventure that requires full awareness of its specific demands. Before clicking the registration button, make sure you validate the following points:
1. Read the Official Guide & Agreement You commit to having carefully read the “Participant’s Guide: 2027 Rules and Information” as well as the official Event Agreement. These documents contain essential legal, logistical, and safety clauses required for your participation (see the Rules/Agreement tab).
2. Accept the Rules of the Game Your registration acts as an electronic signature. It implies your full, complete, and unreserved acceptance of the internal rules and the event agreement.
3. Consult the FAQ You certify that you have reviewed the FAQ tab and have properly informed yourself about the actual nature and high demands of the Gravel Tro Breizh. You know exactly what you are getting your wheels into!
4. Sign the Pact of Absolute Self-Sufficiency You pledge on your honor to scrupulously respect the “Self-Supported” rule. Every point detailed in the reminder document must be fully understood and integrated.
By validating your registration, you join the start list and are officially ready to enter the legend of this 10th edition!
How to Register?
🚀 Registration Launch & “Early Bird” Privilege
Mark your calendar: the official grand launch of registrations for this historic 10th edition will take place in September 2026.
But to celebrate this milestone, we have decided to spoil the most passionate among you: 50 exclusive spots will be available for early access (Until June 30th) ! By becoming one of these 50 pioneers, you will enjoy unique advantages:
- Your guaranteed spot: Secure your presence on the starting line before the general public opening and skip the stress of the ticket rush.
- The collector’s gift: Receive an exclusive, brand-new piece of gear specially created for early-bird registrants. A true badge of honor that you won’t find anywhere else.
- The “Unique” bonus: We personalize your cap’s visor with your first name or nickname. Proudly wear a one-of-a-kind gift on the slopes!
- “Direct Line” VIP access: Join a privileged exchange group before the event. You will have direct access to ask all your questions to the organization, as well as to ultra-distance specialists and veteran finishers of the Gravel Tro Breizh. This is the absolute best way to fine-tune your preparation, gear choices, and strategy with those who know the terrain inside out!
Secure one of the 50 exclusive spots right now!
How to Register?
- Read all the information on the website to fully understand the philosophy of the Gravel Tro Breizh regarding physical commitment, the route, and equipment.
- Carefully read the agreement and the regulations (registering acts as your official acceptance of both).
- Registration opening: Monday, September 1st, 2025, starting at 7:00 PM.
- Registration deadline: Sunday, April 19th, 2026 (or as soon as the maximum rider capacity is reached).
Insurance & Refunds: Please Read Carefully
Cancellation insurance is available when you register. It covers all unpredictable and sudden causes. In the event of an unforeseen and/or accidental inability to participate in the Gravel Tro Breizh, you will be refunded up to the close of registrations (which is Sunday, April 11th, 2027)—subject to a 20% deductible.
We strongly recommend taking out this insurance to cover last-minute complications; an injury in the final weeks is always possible and deeply regrettable. Please note that no refunds will be issued by the association without this insurance. For just a few extra euros, it would be a shame to go without it!
Outside of the cancellation insurance option, no refunds, resales, or registration transfers to a future edition are permitted (your registration implies your acceptance of this clause).
💬 Still have a question?
If you haven’t found the answer to your question, don’t panic! The spirit of the Gravel Tro Breizh is also all about mutual support and sharing experiences.
- Connect with the Community : To chat with riders from previous editions and gather expert tips from veterans on gear, sleep management, or gear ratios, join the Facebook group “Erminig Cycling Club“! It is the perfect place to ask the community’s enthusiasts your questions.
- Contact Us Directly : If your inquiry concerns the organization or a specific administrative point, feel free to send us an email. We will do our best to get back to you as quickly as possible.
See you very soon on the trail!
2026 Edition – 9the Edition
- Distance: 1,360 km
- Elevation Gain: 20,000 m
🚴♂️ Men’s Top Times
| Position | Rider | Nationality | Time |
| 1st | François LEMANCEL | 🇫🇷 French | 4 days 7 hours 54 minutes |
| 2nd | Patrick BESSON | French | 4 days 23 hours 20 minutes |
| 3rd | Romain BOULLAND | 🇫🇷 French | 5 days 5 hours 27 minutes |
| 4th | Philippe FRANCIS-CAIGNEUX | 🇫🇷 French | 5 days 5 hours 41 minutes |
| 5th | Guillaume DE CEZAC | Suisse | 5 days 5 hours 56 minutes |
🥇 Fastest Women’s Time
Clara THILLAYE – 6 days 18 hours 46 minutes
- 📊 Event Statistics
Number of Starters: 84
Number of Finishers (within time limit): 48
Number of Finishers (outside time limit): 1
Past Editions Stats: 2025 Edition – 8th Edition
- Distance: 1,363 km
- Elevation Gain: 20,000 m
🚴♂️ Men’s Top Times
| Position | Rider | Nationality | Time |
| 1st | Yoan DERCOURT | 🇫🇷 French | 3 days 20 hours 15 minutes |
| 2nd | Lucas BECKER | 🇩🇪 German | 3 days 21 hours 2 minutes |
| 3rd | Etienne HAMON | 🇫🇷 French | 4 days 12 hours 52 minutes |
| 4th | Camille MINARD | 🇫🇷 French | 4 days 14 hours 39 minutes |
| 5th | Stefano SEMENZATO | 🇮🇹 Italian | 4 days 20 hours 19 minutes |
🚴♀️ Women’s Top Times
| Position | Rider | Nationality | Time |
| 1st | Leila SERBOUTI | 🇫🇷 French | 6 days 16 hours 48 minutes |
| 2nd | Muriel ROHAUT | 🇫🇷 French | 6 days 18 hours 5 minutes |
| 3rd | Heidi Lina HERTACH | 🇨🇭 Swiss | 7 days 7 hours 36 minutes |
📊 Event Statistics
Disqualified: 2
Starters: 139
Finishers: 77
Past Editions Stats: 2024 Edition – 7th Edition
- Distance: 1,310 km
- Elevation Gain: 19,500 m
🚴♂️ Men’s Top Times
| Position | Rider | Time |
| 1st | Judicaël SOLIER | 4 days 11 hours 9 minutes |
| 2nd | Marc LE ROY | 4 days 13 hours 44 minutes |
| 3rd | Stevan ROUE | 4 days 20 hours 25 minutes |
| 4th | Jeremy JACQUEMIN | 5 days 3 hours 52 minutes |
| 5th | Julien PONTOREAU | 5 days 5 hours 15 minutes |
🚴♀️ Women’s Top Times
| Position | Rider | Time |
| 1st | Marie GEST | 5 days 18 hours 54 minutes |
| 2nd | Chloé MIEZE | 6 days 5 hours 8 minutes |
| 3rd | Camille RENARD | 6 days 14 hours 20 minutes |
| 4th | Emilie VERNEY | 6 days 18 hours 50 minutes |
| 5th | Marie Line PHARISAT | 7 days 8 hours 58 minutes |
📊 Event Statistics
Finishers: 106
Starters: 197
