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entries openChallenge Running Ltd
Thames Ring 250
Thames Ring Series
Next edition: Wednesday, 21 April 2027 – Sunday, 25 April 2027Streatley / Goring-on-Thames, England
The full Thames Ring circuit from Streatley along the Thames, Grand Union Canal and Oxford Canal on mostly rural towpaths and footpaths.
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Distance250 mi
AscentUnknown
Climb / kmUnknown
Cutoff100h
Cutoff pace14:55/km
TechnicalityUnknown
EntryFrom £325
FormatLooped
Next edition
21 April 2027 – 25 April 2027
This is the most relevant confirmed edition currently held for the permanent race family. Edition-specific facts should still be checked against the final organiser instructions.
Edition archive
This is the only edition currently stored for this race family. Earlier verified editions can be added without changing the permanent race URL.
Check the official race source (opens in a new tab)Race For You difficulty
9.3/ 10
Extreme
Limited evidence confidence · 54% evidence coverage
This score is driven most by substantial race distance, accumulated fatigue and format burden, exposure and self-sufficiency. Difficulty V2's separate time-limit modifier adds 0.00 points here and is capped at 0.70; a broad limit cannot erase extreme intrinsic demand. This is independent of the public Cutoff Pressure V2 band.
Weather, conditions and individual preparation can change the real difficulty significantly.
How the score works Distance, weighted 30 percent9.5 out of 10
Climbing, weighted 25 percent5.5 out of 10
Technicality, weighted 15 percent5.5 out of 10
Accumulated burden, weighted 17 percent9.4 out of 10
Exposure & support, weighted 13 percent8.1 out of 10
Course analysis
What shapes this race
Expect long runnable canal sections where pace discipline matters more than technical skill, largely runnable, non-technical surfaces.
canaltrailmixednon-technical
Cutoff analysis
Low–moderate pressure
To finish inside 100h, the raw average required is 14:55 per kilometre (24:00 per mile), including every stop.
Raw pace14:55/km
PressureLow–moderate pressure
Cutoff pressure compares the published time limit with distance, ascent and verified course demands. Lower pressure does not mean the race is easy. Raw pace includes checkpoints, food stops, navigation errors and any sleep; it is not a pacing plan.
Because ascent is not verified, Cutoff Pressure V2 uses the model's neutral 20m/km reference density. This assumption does not fill the ascent value or make missing evidence look easy.
Who this suits
First ultra?
There is not enough verified information to assess first-ultra suitability yet.
Navigation
self-navigation
Route-finding is part of the challenge. Carry the required mapping tools and be able to use them in darkness and poor visibility.
Exposure & kit
extensive kit
Significant overnight running is likely for many entrants. Lighting, temperature management and sleep strategy can materially affect the outcome.
Personal race predictor
Prediction unavailable
No current compatible predictor target is available for this family. The selected edition may be complete or cancelled, awaiting a successor, non-standard, or missing model-critical course evidence; older facts are not substituted.
Practical detail
Support & logistics
StartStreatley / Goring-on-Thames
FinishStreatley / Goring-on-Thames
Support levelsemi-supported
Logistics are only shown where currently recorded. Confirm parking, transport, crew access and final aid-station plans with the organiser.
Latest verification
Trust the source, see the gaps.
Data PartialStarts 10:00 Wednesday and finishes by 14:00 Sunday. Preserve marketed 250mi/402.336km as primary and organiser's approximately 256mi/411.992km as the measured alternate in this note. First 15 entries £325, then £375. Entries close 2027-04-01. Primary geography is South East/Thames-Grand Union-Oxford Canal with a Midlands route tag; add once in Phase 16 and do not duplicate in Phase 17.
- Successful source check
- 3 Sept 2026
- Catalogue record updated
- 3 Sept 2026
- Official source
- Available
Still unverified: elevation.
Event details can change after a successful source check. Confirm the final route, kit, cutoff, price and entry terms directly with the organiser before entering or travelling.
Found something wrong?
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