race info
Distance
25.75 km
Swim
0.75 km
Bike
20 km
Run
5 km
London T100 Triathlon 2025
Register your interest
Pre-sale for London T100 2025 is now closed – entries will go back on sale soon. 2024 was a sell-out event with over 4,000 participants, so get your name on the list to be first to hear when entries reopen!
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Overview
This summer, long distance triathlon graces the streets of London! As we build upon the legacy of the London triathlon, this is your chance to join the UK’s biggest city triathlon, as you swim through Royal Victoria Dock and race alongside London’s most memorable landmarks. The London T100 offers one of our most expansive selection of event types and places are selling fast – don’t miss the opportunity to be part of something special!
Race Courses
2024 course map shown.
The Swim
The London T100 Triathlon is set to take place in the iconic Royal Victoria Docks, a venue known for its rich maritime history and striking urban landscape.Â
The freshwater 750m swim will set off in a rolling start format from the start pontoon located just outside the Excel Centre. Please make sure you arrive at the swim start area 20 minutes prior to your race start.Â
water CUT-OFF
The experienced age-group triathlon is before the professional race, which means there will be cut-off times imposed on each leg to ensure we’re ready to roll for the cameras at 3pm. Please take note of these cut-off timings prior to registering for the race.
Swim cut-off: Completing the first 200m within 5 minutes, completing 2km within 55 minutes after your swim wave start.
The Bike
The London T100 Triathlon bike course offers a dynamic and scenic ride through some of the city’s most iconic landmarks. For sprint and super sprint athletes, the cycling route loops around the vibrant Docklands area, providing a fast and exciting urban course.
Olympic and T100 athletes will head out towards Big Ben. This extended route takes them past several of London’s most famous sites, including the London Eye, Tower Bridge, and the Tower of London.
This diverse course not only challenges athletes with its urban terrain but also offers breathtaking views of the city’s historical and cultural landmarks, creating a truly unforgettable cycling experience.
CUT-OFF
The experienced age-group triathlon is before the professional race, which means there will be cut-off times imposed on each leg to ensure we’re ready to roll for the cameras at 3pm. Please take note of these cut-off timings prior to registering for the race.
Bike cut-off: 4 hours 30 minutes after your swim wave start
The Run
The London T100 Triathlon’s run course will take athletes alongside the scenic Royal Victoria Docks, close to the ExCeL Centre. This route offers participants a picturesque and invigorating experience, with stunning views of the water and the iconic London skyline.Â
The course is designed to be flat and fast, ideal for both competitive runners and those looking to enjoy the unique atmosphere of this urban venue. Runners will benefit from the well-maintained paths and the enthusiastic support of spectators, ensuring a memorable and motivating end to the triathlon.
The run course will vary depending on the competition you are entered into. All T100 participants will complete 6 laps of the 3km course.Â
For all other distances the course is 2.5km in length. Olympic distance participants will complete 4 laps, Sprint participants will complete 2 laps, and Super Sprint will complete 1 lap.
CUT-OFF
The experienced age-group triathlon is before the professional race, which means there will be cut-off times imposed on each leg to ensure we’re ready to roll for the cameras at 3pm. Please take note of these cut-off timings prior to registering for the race.
Run cut-off: 6 hours 30 minutes after your swim wave start
Venue Map
Spectator Viewpoints
Overview
break your limit. Join the race.
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Watch 2024 Highlights
Benefits
You Won't Want To Miss This!
The Ultimate Test for all abilities
Whether you're new to tri or a seasoned competitor, the London T100 has something for everyone.
UNIQUE T100 RACE PACK WITH ENTRY
Included with every triathlon entry is your Official T100 race T-Shirt, Race Bag, and much more.
FOLLOW IN THE PROS' FOOTSTEPS
Join the global triathlon family and race on the closed roads just like the world's top professional triathletes.
Race On The Streets Of London
Line up in Britain’s capital and join one of the world’s biggest triathlons, as you race past iconic sites like Big Ben.
Gallery
2023 moments
Other events
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