ATW Bristol Triathlon
Bristol, United Kingdom · July · Independent (ATW)
Course: 0.8 km (0.5 mi) swim, 21 km (13.0 mi) bike, 5 km (3.1 mi) run. 750 m / 21 km / 5 km (0.47 / 13.0 / 3.1 mi); some listings show 22 km (13.7 mi).
Why people love it
- Bike on the closed Portway, flat and fast, under the Clifton Suspension Bridge.
- Enclosed Cumberland Basin swim with no tide, with canoe and pontoon helpers reported in 2012.
- Flat run along the River Avon, finishing in the harbour area.
- Sprint and Standard distances, plus aquabike and relay.
- Wetsuit hire is offered, which helps newcomers.
Watch out for
- The bike is laps of about 7 km (4.3 mi) with U-turns, so the course gets busy.
- No parking at the venue. Use city-centre car parks or a drop-off point.
- Standard has a 42 km (26.1 mi) bike and 9.6 km (6.0 mi) run, off the usual Olympic lengths.
- The 2026 route changed because of an event beneath Brunel Way. Check race info.
- Listings disagree on distances and few athletes have written recently, so confirm details with the organiser.
Race
How racers feel about it, how well it is run, and how it treats a first timer. Counts for 30% of the overall score.
Toughness: Easy
- Racer satisfactionLoved3.6
Warm 2011 and 2012 write-ups and an upbeat 2026 photo report. Few athletes have written about recent editions. · Low confidence
- OrganizationWell run3.5
In 2012 waves ran on time with many marshals. In 2026 the route changed at short notice because of a rave under Brunel Way. · Low confidence
- First timer friendlyFriendly4.0
Closed roads, canoe cover and a short 750 m (0.47 mi) swim in an enclosed dock. · Low confidence
Course traits, not part of the score
- PR potentialFast3.9
Fast flat course with U-turns. The 2012 age-group winner averaged 36.9 km (22.9 mi)/h (22.9 mph) on the bike. · Low confidence
Swim
Wetsuit odds, water temperature, calm, and the experience of the start. Counts for 16% of the overall score.
- Wetsuit legalUsually3.9
British Triathlon follows World Triathlon, with a 24.6 °C (76.3 °F) ban. UK harbour water is rarely that warm, but no temperature is published. · Low confidence
- Water temperatureAcceptable3.3
No temperature is published. UK summer water is often 16 to 20 °C (61 to 68 °F). · Low confidence
- Calm waterMostly calm4.2
Enclosed dock with no tide or swell. · Medium confidence
- Swim easeEasy3.8
Straight dock basin. One 2012 racer drifted right but corrected. · Low confidence
- Swim experienceFine3.1
Urban harbour setting. Nobody reports on water clarity. · Low confidence
- Swim supportGood3.9
Canoeists on course and helpers on the pontoon in 2012, wave starts and wetsuit hire. Nothing recent on safety cover. · Low confidence
Bike
Road surface, closures, scenery and wind. Counts for 18% of the overall score.
- Road surfaceMixed3.4
Urban dual carriageway. No one comments on the surface. · Low confidence
- Road closuresMostly closed4.3
The Portway is closed to traffic per the organiser. In 2012 an ambulance still forced a swerve on the flyover. · Low confidence
- Bike sceneryBeautiful3.8
The ride passes under the Clifton Suspension Bridge and along the Avon Gorge. · Low confidence
- WindSome wind3.2
Valley road, but a 2012 racer found the wind stronger than expected. · Low confidence
Course traits, not part of the score
- Bike speedFast4.0
A 2012 racer called the flat Portway his fastest ride, though the out-and-back laps include U-turns. · Low confidence
- Bike flatnessMostly flat4.4
Flat river valley. No gain is published, and it is likely under 75 m (250 ft). · Low confidence
- Bike simplicitySome technical parts3.3
Out-and-back laps with turnarounds and a flyover section. · Low confidence
Run
Crowds, aid stations, conditions underfoot and scenery. Counts for 13% of the overall score.
- Crowd supportDecent3.4
Marshals and spectators cheered in 2012, and the two-lap basin run keeps spectators close. · Low confidence
- Aid stationsStandard3.3
Run aid has not been described by athletes. · Low confidence
- Run sceneryBeautiful3.8
Avon Gorge and Clifton Suspension Bridge views from the towpath. · Low confidence
- Run conditionsEasy3.9
Flat course in mild summer temperatures. · Low confidence
Course traits, not part of the score
- Run flatnessMostly flat4.4
Flat basin and towpath run. · Low confidence
Conditions
Air temperature, how predictable the weather is, setting, and spectating. Counts for 13% of the overall score.
- Air temperaturePleasant4.0
Bristol summer mornings are typically 12 to 23 °C (54 to 73 °F). · Low confidence
- Weather reliabilityVariable3.2
Changeable UK summer weather with rain possible. · Low confidence
- Venue beautyLovely3.8
Historic harbour with the Avon Gorge and Suspension Bridge nearby. · Low confidence
- Spectator friendlyEasy3.9
Basin swim, laps and a flyover finish all sit in a small area. · Low confidence
Course traits, not part of the score
- Low altitudeSea level4.9
About 10 m (33 ft) above sea level. · High confidence
Stay and travel
Hotels, walkability, getting there, and the town around the race. Counts for 10% of the overall score.
- Hotel availabilityGood3.8
Large city with plentiful hotels. · Low confidence
- Hotel valueNormal3.0
City prices. No race-specific information. · Low confidence
- WalkabilitySome driving3.2
No parking at the venue, so use city-centre car parks. Transition and finish are close together. · Low confidence
- Travel easeEasy4.2
Bristol Airport is 13 km (8 mi) away and Temple Meads rail station is 3 km (1.9 mi). · Medium confidence
- LogisticsSome complexity3.4
One base at Cumberland Basin with registration the day before or on race morning, but no on-site parking. · Low confidence
- Town and foodGood4.2
Bristol has a well-regarded food scene, though no athlete mentions it. · Low confidence
Key facts
- Location
- Bristol, England, United Kingdom
- Typical month
- July
- Latest or next date
- 1 August 2027
- Organiser
- Independent (ATW)
- Field size
- About 1,000 athletes
- Distances (non-standard)
- 0.8 km (0.5 mi) swim, 21 km (13.0 mi) bike, 5 km (3.1 mi) run
- Swim venue
- Cumberland Basin, Bristol Harbour (harbour)
- Wetsuit
- Legal
- Swim start
- wave
- Bike laps
- 3
- Run laps
- 2
- Run shade
- mixed
- Air temperature
- 12–23 °C (54–73 °F)
- Humidity
- moderate
- Altitude
- 10 m (33 ft)
- Nearest airport
- Bristol Airport (BRS), 13 km (8 mi) away
- Where to stay
- Clifton, Harbourside
- Booking
- No parking at the venue; ATW points to city-centre parking and drop-off points. Registration the day before and on race morning.
What racers and reviewers say
- Alan and Anna blogRaced 2012 · blog · Positive
Age-group winner's report on the Harbourside sprint (750 m (2,460 ft) / 0.47 mi swim, 20 km (12.4 mi) / 12.4 mi bike on the closed Portway, two laps). Swim in Cumberland Basin with canoeists and pontoon helpers; waves started on time and high-vis marshals were numerous. Wind was stronger than expected on the bike and an ambulance forced a swerve on the flyover.
“We'll be back again though”
- Alan and Anna blogRaced 2012 · blog · Positive
Pre-race recon ride on the Portway: a fast two-lap out-and-back on a near-flat dual carriageway with a very slight incline, closed on race day. Draft behind a lorry hit 25 to 40 mph (40 to 64 km/h); the return was slower.
“fastest ride along the Portway ever”
- Bristol24/7Raced 2026 · article · Mixed
Photo report on the 12 Jul 2026 edition: swim in Cumberland Basin, Portway bike, run through Hotwells. The route had to be changed because an early-morning rave took place beneath Brunel Way. (Page blocked; details from search summary.)
Raced ATW Bristol Triathlon? Your notes on the course, conditions and logistics help the next athlete decide.
Sources
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