Before the spotlight. Before the crowd. There is silence. Then a choice. Fight for every move… or fade into oblivion. This isn’t a competition. It’s a confrontation with your limits. This is the Team Boulder Arena.
You’re a professional athlete looking for more info about attending the competition? Need clarification on the rules, assistance to participate, or want to join us? All the details are right here!
You’re an amateur and want to take part? Already got your spot? Everything you need to get ready for TBA #4 is right here!
Want to experience the competition live in the arena? Catch the finals on the big screen at our Bastille gym? Join the afterparty? All the info is right here!
Arc'teryx is the event’s premier partner.
The competition is open to all, but a consistent climbing level is strongly recommended.
The concept is simple: one climber climbs while the other supports and coaches. Each team has 4 minutes to top the boulder — go over, and it’s elimination. Even tougher, in the finals, the first boulder is sudden death: if one climber fails, the whole team is out.
A ruthless rule that keeps athletes under constant pressure, where every fall could mean the end of the road. TBA is designed to be accessible, yet delivers rare intensity, with no second chances. This unique format attracts both seasoned climbers and those who might hesitate to enter more traditional comps, thanks to its friendly vibe and team spirit.
A community-driven event: shaped by the intimate setting of Climbing District Buttes Chaumont, camaraderie and adrenaline combine to create an electric atmosphere… A true “Boiler Room”.
Leading partner brands, like Arc’teryx, help deliver a unique experience to both participants and the climbing community in an exceptional venue.
The must-attend event for all climbing enthusiasts.
Join our £5 half-term climbing lessons from 16–20 February.
The Siege: London’s Biggest Bouldering Competition
Start your year with a challenge that gets you moving, exploring, and maybe even WINNING BIG.
From Friday January 9 to Sunday January 11, we’re kicking off the year in explosive style: open days, special offers, and activities!
Tottenham Hale now offers some of the most affordable climbing in London, with entries from £8.50 and 10-pass packs at £75. Check out the new prices.
Student Deal: £5 day pass in our London climbing gyms every Monday and Friday. Offer available to students with a valid ID. Climb, train, and enjoy a full day on the wall without breaking the bank.
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*The information presented in this article corresponds to the period of its publication - September 2025. To find out about our current offers and prices, please visit our store
