Distance
100 KM
Swim
2 km
Bike
80 km
Run
18 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
Following the sell out of our 2024 event, join thousands of athletes from around the globe in one of the largest and most iconic triathlons in the world! The London T100 Triathlon offers a unique and unforgettable, closed-roads racing experience through the iconic city centre. A feeling that you won’t find anywhere else.
Race Courses
2024 course map shown. 2025 map subject to change.
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 2km 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
T100 participants will complete two laps of the course and there will be no aussie exit or getting out of the water in between laps.
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.
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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
Benefits
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100km: The Ultimate Test
Whether you're new to tri or a seasoned competitor, the 100km distance is an endurance challenge like no other.
UNIQUE T100 RACE PACK WITH ENTRY
Included with every T100 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.
GENERAL REFUNDS
We understand that sometimes things just don’t go to plan! That’s why we have an industry leading refund policy to help you feel confident in signing up for our events.
- 50% refund until 30 days prior to race day (request in writing)
- 25% up to 7 days prior to race day (request in writing)
- No refund after 7 days prior to race day
Contact Us
Need help or have more questions? Don’t hesitate to get in touch.
Other events
London T100 hosts a selection of triathlon event distances so no matter your experience or ability, there’s the chance to take in this iconic race on closed roads.