London T100 Triathlon Weekend 2027
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.
53 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 block starts closer in; what you do now decides how high it can climb.
Building for this one? T100 training support cover the sessions, the weekly shape and how the block is paced. The R.A.C.E. Framework explains why it is built that way.
Build my complete road.
Commit to the date and the work gets a shape: your countdown starts, the emails arrive in step with your build, and the app anchors a recovery-led block so the final week lands exactly on race day.
One confirmation email, then the road begins. Registering for the race itself stays with the organiser.
“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.”
The race
The course
No course maps for this race. T100 publishes no downloadable route for any leg of this race, so there is nothing to draw a course map from. Everything below comes from the official course page, checked on the date at the foot of this section.
Royal Victoria Dock, enclosed and sheltered, so this is about as controlled as open water gets in London. The T100 swims 2km, the Olympic 1.5km, the Sprint 750m and the Super Sprint 400m.
80km for the T100, which is the same distance the professionals race on the T100 World Tour. Olympic rides 40km, Sprint 20km, Super Sprint 10km.
18km for the T100, three kilometres short of a half marathon and long enough that pacing it as a 10k is a mistake. Olympic runs 10km, Sprint 5km, Super Sprint 2.5km.
Not yet confirmed for this edition: lap counts, elevation gain, cut-off times, water temperature, transition locations. We publish these only once they are on the official course page, so check there before you pace off anything here.
Course details verified against the official London T100 Triathlon Weekend course page on 14 August 2026. Courses change; the official page is always the last word.
Questions, answered
When is London T100 Triathlon Weekend 2027?
What distances can I race at London T100 Triathlon Weekend?
How hard is the course?
What is the swim like?
How long do I need to train for it?
How do I enter?
Read before you race
Your First Triathlon.
IRONMAN Kalmar Swim Preparation for Open Water and Contact
Race Week Is Where People Unravel.
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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.