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

The GTB Series Spring Edition is part of Erminig’s “Adventure & Discovery” lineup.

Our main goal is simple: helping you discover Brittany while introducing you to long-distance cycling on a route specifically adapted for gravel bikes. Even so, this adventure remains a real challenge for anyone wishing to experience multi-day bikepacking for the first time!

Running parallel to the Gravel Tro Breizh—the legendary but notoriously tough Breton event—Erminig is proud to offer an accessible alternative open to everyone.

From 8 to 15 May 2026, enjoy a route mapped out with love through Brittany, its myths, and its most iconic landmarks. On the agenda: 900 km to smoothly ease your way into long-distance riding and bikepacking.

🚴‍♂️ A 100% Accessible Gravel Adventure

Accessible routes designed to discover the long-distance world. A Gravel bike will be your perfect companion to roam the most beautiful corners of Brittany. Expect a mix of backroads, easy paths, and smooth tracks on an event that puts discovery and friendliness first!

• Zero Racing Mindset: Daily distances are well-balanced to ensure you have plenty of time to enjoy the Breton landscapes.
• The 2027 Checkpoints: Restaurants, bars, pubs, and crêperies will be scattered along the entire route to give you the warmest local welcome.
• Safety & Tracking: You will be equipped with a GPS tracker to ensure your safety and allow your loved ones to see exactly where you are. Since this adventure is not a competition, there will be no rankings and no final times.

An Accessible Long-Distance Adventure

For this edition, we offer a 900 km route to be completed over 8 days—which comes out to a very manageable daily average of 112 km.

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

📍 The Base Camp: Lac de Trémelin

The Lac de Trémelin will serve as our start and finish base camp throughout the week. Located 30 km west of Rennes, the start line is easily accessible via TGV train.

While the route’s difficulty has been carefully adapted and smoothed out, it will still take you through the very same iconic places as the Gravel Tro Breizh.

🗓️ Schedule & Logistics

Saturday, 15 May (End of Day): The Finish Line You will have until late Saturday afternoon to complete your journey and cross the final finish line.

Friday, 7 may (Late Afternoon): Welcome & Check-in Arrive at our base camp right by the lake. This is the perfect time to meet, chat, and connect with the other participants before the big departure.

Saturday, 8 May (Morning): The Grand Start The official start for the 100 participants will take place on Saturday morning.

900 km of Gravel Riding in Brittany

Starting from Lac de Trémelin, this 900 km route will take you on a journey to discover the most beautiful hidden gems of Brittany.

The care and attention put into designing this route are exactly the same as for all our premium events. This 900 km adventure offers an accessible course with a difficulty level tailored specifically for gravel bikes, making it perfect for beginners and less experienced riders alike. Expect quiet backroads, smooth tracks, and accessible paths.

Our team will be waiting at the finish line to welcome you back and hear all about your epic adventure!

📝 In Summary, the Spring Edition is:

• One keyword: Friendliness!
• One goal: Discovering the most beautiful corners of Brittany!
• One objective: Introducing you to long-distance riding gently!

The Route: Smooth Gravel Across Brittany

One Golden Rule: A Route Open to Everyone!

Whether you are a complete beginner or a seasoned rider, the route for this 3nd GTB Series Spring Edition is fully adapted for a Gravel bike.

The track will wind through Brittany using quiet backroads, easy paths, and smooth tracks that are highly accessible on regular gravel tires.

🪵 Adapted Difficulty, True Breton Character

While the route intentionally bypasses the grueling technical sections found on our flagship ultra-distance event, the Gravel Tro Breizh, keep one thing in mind: Brittany is far from flat!

• Gear up wisely: Choose your bike’s gearing accordingly.
• Ride stress-free: Don’t worry, the daily distances are perfectly balanced to ensure you won’t be pushed into the red, leaving you with plenty of energy to fully enjoy your journey.

🎯 The Ideal Format For You

We want to offer accessible tracks to help you discover the world of long-distance riding, whether you are less experienced or an absolute beginner. If you don’t care about racing the clock and just want to soak in the beauty of Brittany, then the GTB Series Spring Edition is your perfect match!

Discover the Best of Brittany

From its rugged coastlines and deep forests to its rolling countryside and heartland center, Brittany boasts an incredibly rich variety of landscapes.

A 900 km journey is the absolute perfect distance to discover a vast majority of these diverse settings.

To keep the magic alive, the route changes every year, allowing you to explore brand-new places. After all, one single trip is never enough to discover everything Brittany has to offer!

🪵 Scouted and Mapped with Love

As with all our events, the route is thoroughly scouted and drawn with passion. We ride here all year round—Brittany is our backyard. What better way to know every hidden gem and share it with you!

2027 Route – Heading north !

For this 3rd edition, a brand-new route will be offered, crafted with the exact same care as always. The full itinerary will be revealed in autumn 2026.

In the meantime, here is a little hint: we will be exploring Northern Brittany, with the grand return of Ouessant very likely on the agenda!

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

What to Know Before Registering

• Age Requirement: You must be 18 years old at the time of the start. Minors, even if accompanied by an adult or parent, are strictly not allowed.
• Medical Fitness: You must be medically fit for long-distance gravel events (a self-declaration form will be required).
• No Selection Vetting: First come, first served!
• Limited Capacity: Registrations are strictly capped at 100 participants.
• Regulations: You must read the Participant Guide and its regulations (registering implies full acceptance of these terms).

🛑 Important Note: Once registered for the GTB Series, you cannot switch to the Gravel Tro Breizh. These two events are entirely independent, with different philosophies and difficulty levels.

💳 Registration Fee & What’s Included

Registration opens on September

The entry fee is €195 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.

Before validating your registration

Please read the participant 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 ?

🚀 Registration Opening & “Early Bird” Privilege

Mark your calendar: the grand official launch of registrations for this 3rd edition will take place in September 2026.

But we have decided to spoil the most passionate among you: 50 exclusive spots will be available in preview (until July 14)! By being part of these 50 pioneers, you will enjoy unique benefits :

• Your guaranteed spot: Secure your place on the starting line before the general opening and skip the stress of the ticketing rush.
• VIP “Direct Line” access: Join a privileged discussion 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 former Gravel Tro Breizh finishers. The best way to fine-tune your preparation, gear choices, and strategy with those who know the terrain by heart!
• The collector’s gift: Receive an exclusive, brand-new item specially created for early bird registrants. A true badge of honor that you won’t find anywhere else.
• The “Unique” bonus: We will personalize the visor of your cycling cap with your first name or nickname. Proudly wear a unique gift out on the tracks!

I’m grabbing one of the 50 exclusive spots right now !

Insurance / Refund: Read carefully

Cancellation insurance 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 GTB series Spring Edition, you will be refunded up until the end of registrations (i.e., until Sunday, April 11, 2027) – with a 20% deductible.

We strongly recommend that you subscribe to it to cover a last-minute hindrance; an injury in the final weeks is always possible and deeply regrettable. (No refund from the association can take place without this insurance). For only a few extra euros, it would be a shame to go without it!

Apart from cancellation insurance, no refund, resale, or deferral of registration is possible (your registration implies acceptance of this clause).