21 – 22 August 2027TriathlonSprint · Olympic · 100km (2-80-18)Our home raceWorld's biggest city triRace the pro course
The successor to the London Triathlon and the world's biggest city-centre tri weekend. Sprint, Olympic or the pro tour's 100km format, all from a sheltered dock swim at Royal Victoria Dock.
Terrain
Road
Closed A-roads and dockside
Elevation
Flat
120m gain · Fast, honest course
Entry
£99+
Variable
Swim
Dock
Royal Victoria Dock, sheltered and calm
Wetsuit
Wetsuit-legal
usually 17–20°C
Region
London
Royal Docks, London
Your runway
54 weeks to race day: base season
Plenty of runway. This far out, the win is a boring, consistent base rhythm: aerobic volume, strength, technique. The structured 12-week block starts later; what you do now decides how high it can climb.
R
Recover
Fix the nervous system first. Sleep, HRV, and the noise out.
A
Align
Fit the plan to your actual life, not the one you wish you had.
C
Condition
Minimum effective dose. The right sessions, done fresh.
E
Execute
Race-week protocol, pacing, contingency. Nothing new on race day.
Building for this one? 70.3 training plan covers the sessions, the weekly shape and how the block is paced. The R.A.C.E. Framework explains why it is built that way.
“Our home race. Flat everything, closed roads, transition inside ExCeL, and the world's best racing the same water the same weekend. If you want a PB course, this is it.”
Abraham Spring: founder, Unbroken
The race
The T100 weekend has absorbed the old London Triathlon and turned the Royal Docks into the biggest city-centre triathlon on earth, delivered by London Marathon Events. Age-groupers pick Sprint, Olympic or the 100km format (2km swim, 80km bike, 18km run) that the pro tour races on the same closed course the same weekend. The dock swim is sheltered and warm by UK standards, the bike is flat closed dual carriageway where you can hold aero and just ride, and transition lives inside ExCeL. For Unbroken athletes this is the home fixture: no travel, no logistics, all execution.
Questions, answered
When is London T100 Triathlon Weekend 2027?
London T100 Triathlon Weekend takes place on 21 – 22 August 2027.
What distances can I race at London T100 Triathlon Weekend?
Sprint · Olympic · 100km (2-80-18). Pick the distance that fits your training runway, not your ego: the right distance is the one you can arrive at fresh.
How hard is the course?
Road terrain, flat profile with around 120m of climbing. Fast, honest course
What is the swim like?
Royal Victoria Dock, sheltered and calm. Wetsuit-legal, usually 17–20°C. Practise open water before race week, not during it.
How long do I need to train for it?
From today you have 54 weeks. A full 12-week recovery-led block fits comfortably: start it in the app and it anchors to this exact date.
How do I enter?
Entries are handled by the organiser, from £99. Use the Register button above: it goes straight to the official site.
Photograph of Royal Docks, London: TheFrog001, CC0, via Wikimedia Commons. Not official race photography.
This listing is for information only. Unbroken is not affiliated with, endorsed by, or sponsored by London T100 Triathlon Weekend or its organiser. Details are based on publicly available information; names are used descriptively to identify the event. For accurate, up-to-date information and to enter, always use the official event website.
