Swim with control
Use open-water sessions to rehearse sighting and settling after a busy start. Build enough continuous swimming that 2 km does not require an early surge.
London T100 Triathlon 2027: course and training guide
London
A London triathlon weekend with Sprint, Olympic and 100 km options. The 2027 route is not yet published; use the latest course context carefully while building preparation for the 2 km swim, 80 km bike and 18 km run.
Terrain
Not yet published
The organiser has not published the 2027 route
Elevation
Not yet published
The organiser has not published 2027 route or elevation details
Access
2027 priority access
The organiser is collecting priority-access requests; live race entry and pricing are not currently published
Swim
Not yet published
The latest published London course used Royal Victoria Dock; the 2027 venue is not yet published
Wetsuit
The 2027 rules are not yet published
Region
London
London
Your runway
51 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.
R
Recover
Consider recovery context, sleep and readiness before adding training load.
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? 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.
Continue with Unbroken
Train locally, personally or in the app.
Choose the level of support that fits your week. Club sessions and coaching are separate services from app membership.
Road to Race
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. Joining this Road does not request priority access; use the organiser link for that.
Already have the app, or want it?
The app takes this race and builds the block around it.
“For the 100 km format, train the transitions between disciplines: controlled open-water execution, repeatable output and fuelling across 80 km of cycling, then a deliberately restrained opening to the 18 km run.”
Abraham Spring: founder, Unbroken
The race
The London T100 weekend offers several ways to race. The longest listed option uses the T100 format: a 2 km swim, 80 km bike and 18 km run. That is its own pacing problem, not a shortened 70.3. The latest published London course used Royal Victoria Dock, but the organiser has not yet published the 2027 venue or route. Training can still connect controlled open-water execution, sustained bike position and fuelling, and an 18 km run that starts with restraint; use the organiser's current athlete information as the final authority for course, rules, cut-offs and transition arrangements.
Training preparation
How to train for London T100's 100 km format
Prepare for the relationship between 2 km of open-water swimming, 80 km of sustained cycling and an 18 km run. The goal is not three isolated personal bests; it is an effort you can connect without the bike compromising the run.
Hold position and fuel
Develop repeatable bike output in the position you plan to race. Practise taking fluid and fuel on schedule while keeping effort even.
Earn the final 18 km
Run off the bike often enough to recognise the correct opening effort. Start restrained, hold form and only increase pace when the final third is secure.
This is coaching guidance based on the listed race format, not an official course instruction. Check the organiser's current athlete information before making travel, equipment or race-day decisions.
The course
2027 course status: The organiser has not published the 2027 venue or route. Royal Victoria Dock is latest-published London course context, not a confirmed 2027 course.
No 2027 course maps published yet. The organiser provides maps and GPX files for the latest published course, but has not confirmed them as the 2027 route. The leg context below is therefore qualified rather than presented as current.
Swim2 km
Lap count not published
The 100 km format begins with a 2 km swim. The latest published London course used Royal Victoria Dock, but the 2027 venue is not yet published. Practise sighting, a controlled opening effort and swimming continuously before race week.
Bike80 km
Lap count not published
The 100 km format has an 80 km bike leg. Build the ability to hold a repeatable effort in race position, fuel on schedule and leave enough control for the run.
Run18 km
Lap count not published
The 100 km format finishes with an 18 km run. Rehearse an intentionally restrained opening pace after sustained race-position riding.
Not yet confirmed for this edition: 2027 venue and route, 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.
Latest published course context reviewed on 14 August 2026. Check the organiser's 2027 page for updates.
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?
Not yet published terrain, not yet published profile. The organiser has not published 2027 route or elevation details
What is the swim like?
The latest published London course used Royal Victoria Dock; the 2027 venue is not yet published. The 2027 rules are not yet published. Practise open water before race week, not during it.
How long do I need to train for it?
Race day is 21 – 22 August 2027. For T100's 2 km swim, 80 km bike and 18 km run, a proper recovery-led build wants about 12 weeks, which means starting around 29 May 2027. Later starts still work: the block compresses honestly rather than pretending, and it always anchors to the exact race date.
How do I enter?
The organiser is currently collecting 2027 priority access; live race entry and pricing are not published on the official page. Use the priority access button above to go to the organiser.
Read before you race
Your First Triathlon.
Nobody warns you about the body marking, the cold, or the fact that everybody looks like they know what they are doing. They do not. Here is the honest version.
How to Taper for a Triathlon
Reduce training volume, retain small doses of intensity, organise equipment and arrive at race day ready to perform.
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Photograph of 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 priority access, always use the official event website.