THE world’s top triathletes are going head-to-head at the T100 Triathlon World Tour London on August 9 and 10, 2025.
Here we take a look at the route the endurance specialists will be taking around our nation’s iconic capital.
GettyThe T100 Triathlon World Tour London route starts and finishes at the ExCeL Centre[/caption]
AlamyThe triathletes must complete a two-km swim around the Royal Docks[/caption]
AlamyThe bike course consists of eight 10km laps from the Royal Docks up to the O2 Arena[/caption]
Race route
The T100 Triathlon World Tour London route for 2025 is set in the London Royal Docks area, starting and finishing at the ExCeL Centre.
The 100km triathlon for professional athletes includes a two-km swim, an 80km bike ride and an 18km run.
The swim takes place in the Royal Victoria Dock — a picturesque body of water rich in maritime history — and consists of two one-km laps.
Exiting the swimming leg at the ExCeL Centre, athletes then take on the bike course, which consists of eight 10km laps.
The route heads west from the docks and turns around near the O2 Arena across the river.
It then circles back past the ExCeL Centre to a second roundabout, offering a 180-degree turn for the riders.
The bike course is mostly flat with approximately 350 meters of elevation, offering a fast, urban route along the Thames.
Next up, competitors tackle the run, which consists of five laps of a 3.6km circuit running alongside the Royal Victoria and Royal Albert Docks.
Offering plenty of opportunities for spectators to follow the athletes closely throughout the entirety of the race, it finishes with an indoor sprint through the ExCeL Centre, where the London T100 champion will be crowned.
London road closures
Several road closures will be in effect for the T100 Triathlon World Tour London, affecting parts of the Wapping area, as well as key roads around the docks to ensure the safety of athletes and a closed-road racing experience.
On Saturday August 9, 2025, the following roads will be closed from 7am until 6.30pm: Leamouth Roundabout, Lower Lea Crossing, Silvertown Tunnel, Tidal Basin Roundabout, Western Gateway, Seagull Lane, Royal Albert Way and Gallions Roundabout.
Local access to and from East India Dock Road and Orchard Place will be facilitated via stewards and an alternative route using Leamouth Road and Lower Lea Crossing during these times.
On Sunday August 10, 2025, road closures include Lower Lea Crossing, Silvertown Tunnel, Tidal Basin Roundabout, Western Gateway, Seagull Lane, Royal Albert Way, and Gallions Roundabout from 4.30am until 4.30pm.
Additionally, Leamouth Roundabout will be closed from 4.30am to 2pm.
For local access on the Sunday, event stewards will manage vehicle movement via Cotton Street, Preston’s Road, Baffin Way, Blackwall Way and Lower Lea Crossing.
There is also a separate closure between 4.30am and 2pm on Sunday August 10, 2025, for Victoria Embankment, Horse Guards Avenue, Northumberland Avenue, Savoy Street, Temple Place, Blackfriars Underpass, Lower Thames Street, Upper Thames Street, White Lion Hill, Byward Street, Tower Hill, East Smithfield, The Highway, Limehouse Link Tunnel, Aspen Way and East India Tunnel.
In the Wapping area, East Smithfield and The Highway will also be closed between 4.30am and 2pm on August 10.
Managed vehicle access will be available with stewards facilitating single-file access along East Smithfield, Thomas More Street and Tower Bridge — which will be open only for local access during this period.
Two vehicle crossing points across The Highway at Dock Street/Vaughan Way and Glamis Road will operate outside the busy closure window, offering limited access at certain times.
Throughout the event, diversion signs and stewards will be in place to guide traffic and assist local residents and businesses with access.
Organisers have worked closely with local councils and Transport for London to minimise the disruption caused during the weekend of the triathlon.
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