The Road Tro Breizh – Road Ultra-Distance:

Brittany, a land of sailors and skippers, is resolutely turned toward the ocean.Yet, this vast territory also boasts a incredibly dense network of secondary roads — a true playground to explore on a road bike.
It is precisely this diversity, between land and sea, that the 5th edition of the Road Tro Breizh invites you to discover.
This edition of the Road Tro Breizh draws a parallel between ultra-cycling and great offshore sailing races like the Vendée Globe. From May 12 to 15, 2027, come brave the elements and step into the legend of the greatest sailors.Hold your course for 485 nautical miles (900 km) through a mix of mandatory segments and free navigation to connect the most mythical lighthouses at the edge of Brittany.

Between Mandatory Sectors and Free Navigation :

During the event, navigation alternates between mandatory sectors and checkpoints to be connected using the roads of your choice.

It’s very simple:

• The Starting and Finishing Pontoons are identical – Start and finish at the Lac de Trémelin (in the town of Iffendic), located 30 km west of Rennes and its TGV train station. A mandatory “start channel” route will launch you into your 900 km assault. Similarly on the way back, a “finish channel” will await you to celebrate your journey, just like a skipper who has triumphed over the hardships of the ocean!

• 3 Mandatory Sectors to be ridden in full – These are handpicked zones selected for their stunning landscapes along the most beautiful backroads of Brittany.

• 3 Resupply Zones – These act as mandatory checkpoints.

• 6 Lighthouses located on the Breton headlands (Cap Sizun and Pays d’Iroise) – True beacons for your navigation, you must pass near these mythical Breton lighthouses.

For this 5th edition, a single distance :

Roughly 485 nautical miles—about 900 km—depending on your route choices in the free navigation zones.

• Go Solo or in a Duo – Take on the challenge entirely self-supported or share the adventure as a pair.
• A Self-Supported Event – Just like the skippers of the Vendée Globe, you must manage your own mechanical issues, resupply, and sleep schedule. The parallel between ultra-distance cycling and offshore racing is absolute!
• Beat the Clock – To finish within the time limit, you must be back before late Saturday afternoon, May 9.
• Live Tracking – Participants will be equipped with MADCAP trackers so followers can track their progress on a dedicated app. Trackers will also be used to verify that all mandatory sectors and checkpoints have been cleared.
• True Breton Beauty – Because Brittany is just as beautiful from its quiet backroads, the Hermine offers you a challenge that lives up to our other legendary events!
• Limited to 99 Riders – This 5th edition of the Road Tro Breizh is strictly capped at 99 competitors.
• Promoting Diversity – To encourage inclusivity and gender balance in ultra-distance cycling, the organizers reserve the right to prioritize female entries—notably by accepting all women’s registrations even if the event is officially sold out.

A single start/finish venue for 3 of our events :

The Road Tro Breizh will take place from May 12 to 15, 2027, at the exact same venue as the 10th Gravel Tro Breizh and the 3nd GTB Series. A full week of celebration and racing, where participants and competitors from all three events will cross paths.

On Saturday evening, May 15, a massive closing party will bring together all competitors from the three events to celebrate!

Start and Finish – Lac de Trémelin / Iffendic, Brittany, France

The starting and finishing “pontoons” are located at the Lac de Trémelin outdoor recreation center, just 30 km from Rennes and its TGV train station. If needed, you can take a regional TER train to Montfort-sur-Meu station, which gets you within 10 km of the start venue.

A “start channel” will guide you through the first few kilometers as you set off on your journey. Similarly on the way back, a “finish channel” will log your final time, allowing you to cross the finish line just like a skipper who has triumphed over the hardships of the ocean !

This year, we are bringing three of our events together at the same venue and on the same dates: the 5th edition of the Road Tro Breizh, the historic Gravel Tro Breizh, and its little sister, the GTB Series Spring Edition.
It’s the perfect opportunity to gather, connect, and share a friendly moment around a massive celebration of ultra-distance cycling!

3 Mandatory Sectors on the Quiet Backroads of Central Brittany:

• Sector 1: 43 km along the quiet backroads of the Blavet Valley (Morbihan).

• Sector 2: 102 km through the Finistère countryside and the Black Mountains (Montagnes Noires) of central Brittany.

• Sector 3: 94 km across the Monts d’Arrée – A perfect parallel to Cape Horn, with its wild landscapes and weather that can change in a matter of minutes!

These sectors are mapped out on quiet, peaceful roads, but do not underestimate the elevation gain, which could seriously complicate your task.

3 Mandatory Resupply Zones :

These act as mandatory checkpoints, allowing you to rest for a few moments and refuel before heading back out to tackle the route.

Un Rayon de Blé Noir crêperie at Lac de Guerlédan.

The shop of our partner Lyophilise & Co at Lorient La Base (the offshore racing hub).

O’Donnell’s Pub in Portsall, Northern Finistère.

6 Lighthouses to Navigate Toward :

These mandatory checkpoints will take you all the way to the rugged tips and jagged coastlines of Brittany. Facing the ocean like a sailor on deck, you will have to brave the Breton weather, which can be notoriously unpredictable. Just like rounding a maritime buoy, your passage will be validated by riding to the foot of these lighthouses, or as close as possible for those located offshore. Exact details will be provided in the Route Guide sent to you upon registration.

• Eckmühl Lighthouse – Pointe de Saint-Pierre, Penmarch
• La Vieille Lighthouse – Raz de Sein / Pointe du Raz
• Saint-Mathieu Lighthouse – Pointe de Saint-Mathieu, Plougonvelin
• CROSS Corsen – Regional Operational Center for Monitoring and Rescue, Plouarzel
• Trézien Lighthouse – Pointe de Corsen, Plouarzel
• Île Vierge Lighthouse – Plouguerneau (The tallest lighthouse in Europe)

Unless you want to double your mileage, the order of these checkpoints follows a pretty natural sequence!

Free Routing Between Sectors, Checkpoints, and Milestones :

Between these mandatory points, you are the absolute captain of your course: it is up to you to chart the best route! But beware—the shortest path isn’t always the fastest… you will have to factor in both the elevation gain and the wind!

Optional Technical Support Zones

In case of a mechanical failure, two partner bike shops will be available. Former participants of our events work at these locations, so you can expect a warm welcome if you run into trouble! You can, of course, bypass their services or find other shops along the way. As a reminder, this is a self-supported event: neither the organizers, fellow competitors, nor family and friends are permitted to assist you with repairs.

Trackers and Route Guide

Every competitor will be equipped with a GPS tracker for real-time location tracking. A live map will also be available on our partner MADCAP’s mobile app. This tracker will also serve to validate your mandatory checkpoints, proving you cleared the sectors and rode past the lighthouses.

The Route Guide

A comprehensive guide detailing all mandatory segments (complete with GPX tracks) and the validation procedures for the lighthouse checkpoints will be sent to you following your registration.

The Map :

Below is a recap map of the course suggested by Erminig for this 5th edition of the Road Tro Breizh (same map of the 4th édition).

Rider Guide & Route Guide

• The Rider Guide contains the official rules and practical event information. It is available upon registration by clicking [this link].
• The Route Guide includes checkpoint locations, mandatory passage points, and sectors—the link to download the GPX files will also be provided in this guide. This document will be emailed to competitors after registration.

Below are several critical rules. The full, comprehensive rulebook is available in the Rider Guide via [this link]:

• The Road Tro Breizh is not a race, but a sports challenge in the form of a brevet.
• This event is governed by the principle of self-sufficiency.
• Participants must be self-sufficient: accommodation, food, mechanical or physical incidents.
• The only authorized assistance is what you find along the route: shops, restaurants, hotels…
• Due to the nature we wish to give to this adventure, the volunteers present at the various checkpoints will not be authorized to assist you.
• We also allow local assistance from people you meet along the route, provided it is not premeditated and you do not know them.
• To respect the “adventure” spirit of the event, booking accommodation before the start is prohibited. Given the long-distance format, weather, mechanical and physical hazards, it is almost impossible to plan a route ahead of time. Once the start is given, you are free to book anywhere.
• Be 18 years old at the time of the start.
• Minors, even if accompanied by an adult/parent, will not be accepted.
• Be medically fit for ultra-distance events. No proof is required; you are free to undergo a medical examination.
• For individual registrations: Participants must be self-sufficient, no sharing of equipment between several participants. The Road Tro Breizh is above all an adventure to be experienced solo.
• For the DUO version: the pair must ride together throughout the event and be self-sufficient – No sharing of equipment with other duos or solo participants.
• The only assistance permitted between participants is moral support.
• No selection process. First come, first served.
• Limited to 99 participants.
• Wearing a helmet is mandatory.
• Wearing a high-visibility vest is mandatory at dusk or in low visibility conditions.
• Your bike must be equipped with a white front light and a red rear light.
• Electric power-assisted bicycles (e-bikes) are not allowed to start.
• In the event of non-compliance with the rules (particularly regarding assistance), the organization will apply time penalties up to disqualification from the event.
• Participants using roads closed to bicycle traffic will be disqualified (expressways, for example).
• The use of shuttles and ferry crossings is prohibited.
• Participants are free to choose the roads and tracks they take between segments and mandatory checkpoints – these choices must be personal and cannot be shared between several participants.

Rules for the DUO version:

• For the duo version, both participants must register (2 registrations for the team)
• The pair must not split up and continue separately.
• In the event that one team member drops out, the remaining participant may continue the event off-race (unranked).

“No-assistance” rules:

By registering for the Road Tro Breizh, you commit to respecting its rules. Particularly the “no-assistance” rule.
The rules apply so that all competitors are on an equal footing.
Here is a document reminding you of the main prohibitions linked to this notion of a unsupported event.
Penalties up to exclusion from the event are planned for participants who do not respect the rules!

Registration opens for the 5th Road Tro Breizh: Sunday, August 30 at 10:10 AM

Terms & conditions:

• Must be 18 years old at the time of departure.-Minors, even accompanied by an adult/parent, will not be accepted.
• Must be medically fit for ultra-distance events.
• Individual or duo registration.
• No selection process. First come, first served.
• Limited to 99 participants.
• Departure on Wednesday, May 12 – morning.
• Arrival before Saturday, May 15 – late afternoon.
• For the DUO option: individual registration is required, and you must state your partner’s first and last name in the registration form. Your partner must also register: 2 registrations per team!

Registration is 150 euros (+ 5% management fee charged by the NJUKO platform) and includes:

• The loan of a standalone GPS tracker for live online and smartphone tracking (dedicated app to follow all participants),
• The route guide with GPX files for required sectors and GPS coordinates of the lighthouses to validate,
• A collector cycling cap in the event colors (for registrations before February 15, 2026),
• A participant pack with goodies and gifts from our partners,
• A pre-race briefing with a casual buffet dinner,
• Access to the base village at Lake Trémelin (showers, restrooms, snack bar, and parking on site),
• A festive welcome to celebrate your finish line crossing,
• And of course, the event infrastructure, volunteers, and dedicated media team.

How to register for the Road Tro Breizh?

• Read all the information on the website to fully understand the Road Tro Breizh philosophy regarding physical commitment, route, and equipment.
• Carefully read the rules (registering implies acceptance of the rules).
• You agree to comply with the “unsupported” rules.
• Registration opens on Sunday, August 30 at 10:10 AM
• The BEticketing cancellation insurance provided by MUTAIDE via our partner NJUKO is available when you register. It covers all unpredictable and sudden causes. In the event of an unpredictable and/or accidental inability to participate in the Road Tro Breizh, you will be refunded up to the day before bib pickup (i.e., until May 11, 2027)—20% deductible—See terms and details on the page just before payment. We strongly recommend subscribing to cover a last-minute impediment, as an injury in the final weeks is always possible and unfortunate. (No refunds will be made without this insurance) For a few extra euros, it would be a shame to miss out!
• Registration open until Sunday, April 25, 2027, or as soon as the participant limit is reached!