TriBourne Festival of Endurance

Iconic Full Distance Triathlon returns in 2025. South East Event of the Year and British Championships in 2024. From the organisers of the multi-award-winning Eastbourne Triathlon. Alongside this there will also be a Middle Distance Triathlon, Full and Middle Distance Aquabike, 1.9k Swim, 3.8km Swim and a Marathon!

Starting with an iconic jump from the end of Eastbourne's historic pier to begin your swim, followed by a fast cycle course taking in National Parks and finishing with a flat run route along the beautiful Eastbourne seafront with less than 100m of elevation.

Numbers are strictly limited so please don't delay or you risk the event selling out. We also offer Booking Protection so there really is nothing to lose and everything to gain by entering early!

The swim start is one of the most iconic starts on the triathlon calendar, with a jump off the end of Eastbourne's historic pier!

Perfect for...
Triathletes aiming to complete their first full-distance triathlon. Experienced Ironman athletes looking for an affordable alternative to the 'big branded events' and a fast course.
A relay option is also available for teams of three (one swimmer, one cyclist and one runner).

Key Facts
Date: Sunday 20th July 2025
Location: Western Lawns, Eastbourne
Start time: 5:50am
Swim: 3.8km (sea)
Bike: 180km
Run: 42.2km (fast and flat)
Awards: First three male and female overall and first three male and female in every 5 year age-group.

Swim Route
The swim start is set to be one of the most iconic starts on the triathlon calendar, with a jump off the end of Eastbourne's historic pier!

Cycle Route
If you wish to train on the course, we advise that you only ride the first 20 miles early on Sunday mornings as this section of the course can be busy with traffic at other times. On race day it will be very different; three sections of the course will be closed to traffic (but not the entire course). We have over 400 signs, 100 of which are designed specifically to educate drivers how to overtake bikes safely. We will also have 10 motorcycle marshals, over 30 static marshals and more volunteers on the bike course.

Run Route
The run will head out and back along the gravel path before heading out and back along the lower prom, again towards Holywell. You then head out and back to the far eastern end of the prom. In total you complete the 10.55km lap four times.

The swim start is one of the most iconic starts on the triathlon calendar, with a jump off the end of Eastbourne's historic pier!

Perfect for...

Anyone who wants to finish their first longer distance triathlon. Experienced athletes looking for an affordable alternative to the 'big branded events' and a fast course.
A relay option is also available for teams of three (one swimmer, one cyclist and one runner).

Key Facts
Date: Sunday 20th July 2025
Location: Western Lawns, Eastbourne
Start time: 6:00am
Swim: 1.9km (sea)
Bike: 90km
Run: 21.1km (fast and flat)
Awards: First three male and female overall and first three male and female in every 5 year age-group.

Swim Route
The swim start is set to be one of the most iconic starts on the triathlon calendar, with a jump off the end of Eastbourne's historic pier!

Cycle Route
If you wish to train on the course, we advise that you only ride the first 20 miles early on Sunday mornings as this section of the course can be busy with traffic at other times. On race day it will be very different; three sections of the course will be closed to traffic (but not the entire course). We have over 400 signs, 100 of which are designed specifically to educate drivers how to overtake bikes safely. We will also have 10 motorcycle marshals, over 30 static marshals and more volunteers on the bike course.

Run Route
The run will head out and back along the gravel path before heading out and back along the lower prom, again towards Holywell. You then head out and back to the far eastern end of the prom. In total you complete the 10.55km lap twice.

The IronBourne Aquabike options are ideal for anyone wanting to take part in long distance mutisport events without the running. Both full (iron) and middle (70.3) distance options available.

Perfect for...
Competitors who prefer not to run. Triathletes suffering from running injuries.

Key Facts
Date: Sunday 20th July 2025
Location: Western Lawns, Eastbourne
Start time: 6:00am
Swim: 3.8km or 1.9km (sea)
Bike: 180km or 90km
Run: 42.2km or 21.1km
Awards: First three male and female overall in each distance.

Swim Routes
The swim start is set to be one of the most iconic starts on the triathlon calendar, with a jump off the end of Eastbourne's historic pier!

Cycle Routes
If you wish to train on the course, we advise that you only ride the first 20 miles early on Sunday mornings as this section of the course can be busy with traffic at other times. On race day it will be very different; three sections of the course will be closed to traffic (but not the entire course). We have over 400 signs, 100 of which are designed specifically to educate drivers how to overtake bikes safely. We will also have 10 motorcycle marshals, over 30 static marshals and more volunteers on the bike course.

The swim start is one of the most iconic starts on the triathlon calendar, with a jump off the end of Eastbourne's historic pier! The 3.8km swim includes an "Aussie Exit" at the half way point.

Perfect for...
Open water swimmers. Ironman athletes wanting to practice the 3.8km swim ahead of an Ironman later in the year.

Key Facts
Date: Sunday 20th July 2025
Location: Eastbourne Pier
Start time: 6:00am
Swim: 1.9km or 3.8km (sea)
Awards: First three male and female and first three vetertan 40+ male and female.

The IronBourne Marathon will once again take place alongside the triathlon events and will consist of four laps, each of 10.55km.

Perfect for...

Marathon runners of all levels of experience from first-timers to experienced runners. Fast, certified course ideal for anyone looking for a 'good for age' time.

Key Facts
Date: Sunday 20th July 2025
Location: Western Lawns, Eastbourne
Start time: 12pm
Run: 42.2km (fast and flat)
Awards: First three male and female overall and first three vetertan 40+ male and female.

Route
The run will head out and back along the lower prom towards Holywell. You then head out and back to the far eastern end of the prom. In total you complete the 10.55km lap four times.