8-15 May 2027

Lac de Tremelin (35)
30 km west of Rennes

900 km

100% gravel – Backroads & Easy Tracks

GTB Series Spring Edition: A bikepacking adventure to discover long-distance riding in Brittany!
Accessible to everyone on a Gravel bike, both in terms of route and difficulty.
Friendliness and discovering Brittany will be the golden rules of this GTB Series.

    The adventure

    GTB Series Spring Edition – “A Grand Tour of Brittany”

    The GTB Series Spring Edition is part of Erminig’s “adventure and discovery” format.

    One goal: discovering Brittany with an introduction to long-distance riding on a course with difficulty levels tailored for gravel bikes.

    This adventure remains no less of a challenge for anyone looking to discover long-distance riding and bikepacking.

    Alongside the Gravel Tro Breizh—the legendary yet demanding Breton event—Erminig has been offering an accessible adventure for everyone for the past three years.

    From May 8 to 15, 2027, enjoy a route lovingly designed through Brittany, its legends, and its iconic sights. On the agenda: 900 km to ease into long-distance riding and bikepacking.

    A 100% Accessible Gravel Adventure

    The route is accessible and ideal for discovering long-distance riding. The gravel bike remains the perfect choice to explore Brittany’s most beautiful spots. Quiet roads, easy trails, and tracks will make up the itinerary of this ride, which focuses on discovery and camaraderie!

    No race mindset here—the 900 km distance lets you pace your days to enjoy the Breton landscapes at your own speed. You have 8 days to complete your journey, which means aiming for at least 113 km per day—you are free to design your own stages based on your preferences and fitness level.

    We are setting up Checkpoints. Restaurants, bars, pubs, and crêperies will be located along the route to give you the warmest welcome. They are optional, but they offer genuine moments of sharing and togetherness.

    The tracking device provided will ensure your safety and allow your loved ones to follow your progress. Since the adventure is not a competition, there will be no standings or final timing.

    A single location for departures and arrivals: Lake Trémelin (35)

    The start and finish lines will be located at the same site as our renowned but challenging ultra-distance event: the Gravel Tro Breizh.

    Lake Trémelin will serve as the start/finish hub throughout the week. Located 30 km west of Rennes (35), the start is easily accessible by TGV high-speed train.

    The start for the 100 participants will take place on Saturday, May 8 in the morning. You will have until Saturday, May 15 at the end of the day to finish your journey.

    Check-in and welcome will begin on Friday, May 7 in the late afternoon.

    You will be able to meet and chat with other participants at our base village, set right by the lake.

    900 km of Gravel in Brittany

    Starting from Lake Trémelin, the 900 km route will take you on a journey to discover the most beautiful spots in Brittany.

    The same care and attention given to all our events will go into designing this course. This 900 km adventure offers an accessible route tailored in difficulty for gravel bikes, beginners, and less experienced riders alike. Quiet roads, along with accessible tracks and trails.

    The team will be there to welcome you back and hear all about your adventure!

    One keyword: camaraderie!

    One goal: discover Brittany’s finest sights!

    One purpose: ease you into long-distance riding smoothly!

    The program

    A 100% gravel route:

    One word: accessible to everyone!
    Whether you are a beginner or an experienced rider, the route for this 3rd GTB Series Spring Edition is fully tailored for gravel bikes.

    The course crisscrosses Brittany along quiet roads, paths, and tracks easily accessible on a gravel bike.

    It avoids the tougher obstacles found in our ultra-distance event, the Gravel Tro Breizh. But keep in mind that Brittany is far from flat! Make sure your setup is suitable, but rest assured: the daily mileage required to finish on time will be manageable, allowing you to make the most of your journey.

    We want to offer accessible routes for anyone looking to discover long-distance riding, whether you are less experienced or just starting out. If you are not interested in racing against the clock and simply want to enjoy Brittany, then the GTB Series Spring Edition is the ideal format!

    Discover the Best of Brittany

    Between the inland region, the coastline, the forests, and the countryside, Brittany offers a remarkable variety of landscapes.

    The 900 km distance is ideal for exploring a vast majority of these diverse Breton landscapes.
    The route changes every year to show you new places. A single trip is never enough to discover all of Brittany.

    As always with our events, the course is fully scouted and lovingly designed. We ride year-round—Brittany is our playground, and there is no better way to know it and share it with you!

    2027 Route – Heading to Northern Brittany

    For this 3rd edition, a new route will be offered, crafted with the exact same care as the previous 2 editions. We will reveal the full track in the autumn of 2026.

    In the meantime, here is a small hint: we will be riding through northern Brittany, with the likely return of Ouessant on the agenda! Many other surprises will also be in store!

    Don’t delay in registering when sign-ups open on August 30th, as spots are limited.

    So, tempted by this journey of adventure and discovery? Don’t wait too long to secure your spot!

    Register

    Good to know before registering:

    • Must be 18 years old at the start of the event.
    • Minors, even when accompanied by an adult/parent, will not be accepted.
    • Must be medically fit for long-distance gravel events (sworn statement).
    • No selection process. First come, first served.
    • Registration limited to 100 participants – We reserve a minimum of 40 spots for women to promote gender diversity on our adventures.
    • Must have read the rider guide and rules (your registration implies acceptance).

    Registration is 195 euros (+ 5% management fee charged by the NJUKO platform) and includes:

    The “Degemer Mat Bag” (Your Welcome Pack)

    • An exclusive pack handed over at registration, including notably:
    • 2 bio TACX bottles (compostable), customized in the colors of the GTB series Spring Edition 2027.
    • 1 collector cycling cap from the 2027 event (for “early bird” registrations, the visor will be personalized with your first name or nickname).
    • The official event Road Book, essential for validating your precious passages at the various Checkpoints (CP).

    Logistics & Safety

    • The rental of a MadCap GPS tracker: An autonomous beacon to ensure your safety and allow your loved ones to follow your progress live on the internet via a dedicated app.
    • The final GPS track: The precise route to upload to your GPS bike computer or smartphone.

    Conviviality & Infrastructures

    • The Erminig organization: The entire logistical infrastructure, the supportive presence of our volunteers on the field, and the deployment of a dedicated media team to immortalize your adventure.
    • The pre-race: The official start briefing, followed by a friendly aperitif to meet the community.
    • The arrival welcome at Lake Trémelin: Access to showers to freshen up, as well as a well-deserved snack to celebrate your finisher status.
    • This year, we are planning a closing evening with all participants present across the week’s 3 events: GTB Series, Gravel Tro Breizh, and Road Tro Breizh—be sure to keep your Saturday, May 15 evening open!

    Before validating your registration

    Please read the Rider Guide carefully before registering. This document contains important information for your participation.
    Your registration implies acceptance of the rules and regulations contained in the participant guide.

    How to register ?

    Mark your calendar: the official launch of registrations for this 3rd edition will take place on Sunday, August 30 at 10:10 AM.
    Registration open until Sunday, April 25, 2027, or as soon as the participant limit is reached!

    Register for the 3rd GTB Series Spring Edition

    Insurance / Refund: Read carefully

    • 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 7, 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!
    • Apart from cancellation insurance, no refund, resale, or deferral of registration is possible (your registration implies acceptance of this clause).
    FAQ
    What is the GTB Series “Spring Edition”?

    The GTB Series “Spring Edition” is a long-distance bikepacking ride. Open to everyone, it’s the ideal adventure to discover multi-day long-distance riding and get into self-supported bike touring.

    While more experienced riders looking for a casual cruise are very welcome, the format is specifically designed with beginners in mind: a smooth route with zero pressure, no competition, and no clock running. The goal is simply to enjoy the Breton countryside in spring, ride at your own pace, and gain confidence on the bike with ease.

    Is there a time limit to finish the route?

    You have until Saturday, May 15th in the late afternoon to complete your journey. The route is designed to fit your pace: by aiming for about 110 km per day, you’ll have 8 full days to finish the adventure (from Saturday morning, May 8th to Saturday evening, May 15th).

    Depending on your fitness and level, you can definitely extend your daily mileage to finish earlier. However, keep in mind: this is not a sprint or a race! The whole point is to take your time, enjoy the scenery, and keep it casual.

    You are completely free to move at your own pace with zero constraints. Just keep in mind that the organizers will be waiting for you at the finish line until Saturday evening, May 15th. Plus, we’re planning a great wrap-up party to bring everyone together… it would be a shame to miss it!

    Can I do the route with friends or in a group?

    Yes, of course! In fact, it’s highly encouraged! The GTB Series is all about sharing the experience and enjoying a friendly atmosphere. Whether you come with long-time friends, your partner, or riding buddies, the goal is the same: ride together and enjoy a real cycling holiday in Brittany.

    You can definitely register and ride as a group. And if you’re coming solo, don’t worry—you’ll quickly meet other riders along the track to share miles, meal breaks, and great moments at the campsite!

    What is the ideal bike?

    The perfect bike for the GTB Series is a gravel bike! The route mixes quiet Breton backroads with smooth tracks and gravel paths, which are ideal for this setup.

    You can also join with a mountain bike (MTB) or a touring bike, as long as it can comfortably handle off-road terrain. However, leave your road bike at home: with skinny tires, you’ll quickly run into limits once we leave the pavement.

    What type of terrain is it?

    The route is a 50/50 mix: half on quiet, low-traffic Breton backroads, and half on smooth, easy-access gravel tracks and trails.

    As for the terrain, Brittany isn’t flat! Even though the climbs are short, the elevation gain adds up over time. But don’t worry: the GTB Series route avoids major obstacles, steep climbs, and overly rocky or technical sections as much as possible.

    The route is designed to be fully accessible: any beginner can have fun and reach the finish line without getting stuck in difficult terrain!

    What is the maximum number of participants?

    To keep a warm and friendly atmosphere, spots are strictly limited to 100 participants.

    To promote gender diversity in long-distance cycling, 40 spots are reserved specifically for women. Ladies, these spots are held for you to encourage you to take the leap!

    How does it work in practice?

    • Once the quota for men is reached, male registrations will move to a waiting list. Additional spots may open up later if the women’s quota isn’t fully filled.
    • For women, however, there is no cap: if more than 40 of you sign up, we’ll gladly welcome even more of you!

    A word of advice: don’t wait to register! Spots sell out quickly, especially for men where the quota is reached very fast.

    How does sleeping and accommodation work (wild camping, hotels, campsites)?

    You are completely free to choose whatever option suits you best: wild camping close to nature, official campsites, hotels, B&Bs, or guesthouses. There are plenty of accommodation options all along the route in Brittany!

    Unlike our ultra-distance events where flexibility and improvisation are key, here you are allowed to book your accommodation in advance. To make planning easier and give you time to map out your stages at your own pace, we will send you the official GPS track 3 to 4 weeks before the start.

    Is it easy to find water and food shops along the route?

    Yes, very easily! Even though the route takes you through quiet and unspoiled parts of Brittany, it regularly passes through towns and villages. You’ll easily find everything you need to resupply: bakeries, grocery stores, restaurants, inns, and water points.

    We specifically design the route so you never have to ride for hours without finding anything. To make things simple, the route guide provided with the GPS track lists resupply spots and even includes our favorite local recommendations.

    In short, no need to stress: you’ll have plenty of options to refuel (and enjoy plenty of crêpes or kouign-amann) all along the way!

    I’m a beginner, is it difficult?

    The route is specifically designed to be accessible, but keep in mind that it’s still 900 km to cover in 8 days maximum.

    To fully enjoy the experience and avoid a struggle, you just need to show up with a bit of riding under your belt. No need for pro cyclist training! Riding regularly for a few months before the event is more than enough: even daily bike commuting or weekend rides will help you build up miles and take on the adventure with a smile.

    Finally, remember that nothing is mandatory! If fatigue sets in or you need to slow down, there are plenty of options to shorten the route along the way. You remain completely in control of your journey and can adapt the route to your fitness on any given day.

    How does navigation work?

    The route is not signposted or marked on the ground. We provide you with the official GPX track 3 to 4 weeks before the start, giving you plenty of time to study it, plan your strategy, and organize your stages at your own pace.

    All you need to do is load the file into your usual navigation device (bike computer or smartphone app like Komoot, OsmAnd, etc.). The full route is broken down into several sections: this is purely for ease of navigation, not mandatory stages! You remain completely free to manage your progress however you like.

    Still have a question?

    If you haven’t found the answer to your question, don’t panic! The spirit of the GTB Series Spring Edition is all about mutual help and sharing experiences.

    • Ask the community: To connect with past participants, grab tips from veterans on gear, sleep management, or gear ratios, join the “Erminig Cycling Club” Facebook group! It’s the perfect place to ask the community’s passionate riders your questions.
    • Contact us directly: If your request is about organization or a specific administrative point, feel free to send us an email. We’ll do our best to get back to you quickly.

    See you on the trail very soon!