#RedefiningTriathlon

Important announcement!

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28 July

|

London

100KM

Triathlon

TRIATHLON

JULY 2025

|

London

100KM

Triathlon

2025 – Be The First To Hear!

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Register your interest here for priority access to the London T100 Triathlon 2025. Sign up below to receive the latest news, discounts and exclusive partner news/offers from PTO, including age-group participation events.

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Distance

100 KM

Swim

2 km

Bike

80 km

Run

18 km

Don't miss out for 2025

Following the sell out of our 2024 event, now is your chance to be first in line for 2025! 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 race experience that you won’t find anywhere else. Feel the rush as you pass by the Tower Bridge, the London Eye, and other unique landmarks, all while being cheered on by enthusiastic crowds lining the route.

Start your T100 journey today

Register your interest now for the 2025 event. By signing up early you’ll be first in line when tickets go on sale as well as hearing about special offers and important updates. Don’t miss out on the chance to be part of one of the world’s most prestigious triathlons.

Benefits

You Won't Want To Miss This!

The Ultimate Test for all abilities

Whether you're new to tri or a seasoned competitor, the London T100 Triathlon has a challenge for everyone.

UNIQUE RACE PACK WITH ENTRY

Included with every triathlon entry is your Official T100 race T-Shirt, Race Bag/Drawstring 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.

Enter The Race

Sold Out!

The 2023 PTO Asian Open held in Singapore’s awe-inspiring Marina Bay offers an unprecedented swim location and spectacular city circuit course, for a one of a kind event not to be missed.

28

July

100km

Super Early Bird

100km Triathlon

Distance

100KM

Swim

2KM

Bike

80KM

Run

18KM

From

SGD

Sold Out

Including GST +
4.9% registration fee

28

July

100km

Early Bird

100km Triathlon

Distance

100KM

Swim

2KM

Bike

80KM

Run

18KM

From

£

sold out

Including GST +
4.9% registration fee

From

28

July

100km

General Entries

100km Triathlon

Distance

100KM

Swim

2KM

Bike

80KM

Run

18KM

From

£

SOLD OUT

Including GST +
4.9% registration fee

28

July

100km

Final Entries

100km Triathlon

Distance

100KM

Swim

2KM

Bike

80KM

Run

18KM

From

£

SOLD OUT

Including GST +
4.9% registration fee

Singapore T100 Age-Group Open
Three reasons you should race the 100km distance

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.

  1. 50% refund until 30 days prior to race day (request in writing)
  2. 25% up to 7 days prior to race day (request in writing)
  3. No refund after 7 days prior to race day

Contact Us

Need help or have more questions? Don’t hesitate to get in touch.

Participant Info

Join Us In 2025!

Gallery

2023 moments

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.