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Sirona 100K
Sirona series
Next edition: Saturday, 14 August 2027Machynlleth to Mwnt, Wales
The 100-kilometre Sirona race crossing from Machynlleth toward the Ceredigion coast; it remains distinct from the 100-mile Sirona family.
Official race site (opens in a new tab)
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Distance62.1 mi
AscentUnknown
Climb / kmUnknown
Cutoff30h
Cutoff pace18:00/km
TechnicalityUnknown
Entry£145
Formatcontinuous
Next edition
14 August 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
Expand an edition to inspect its year-specific facts. Other years never replace the primary edition facts.
Past editions
2026 to Completed
These facts belong to the 2026 edition only. Missing values have not been copied from another year.
- Distance
- 100 km
- Ascent
- 3,048m approx.
- Cutoff
- 30h
- Entry
- £145
- Format
- continuous · single stage · point to point
- Stage layout
- Not applicable
Successful source check: 3 Sept 2026Source confidence: highThe edition listing, official FAQ and results support the completed 11–12 July 2026 100K, 10,000ft, 30-hour and £145 facts. They remain separate from the existing Sirona 100-mile family.
Check Sirona 100K 2026 source (opens in a new tab)
Race For You difficulty
5.2/ 10
Hard
Limited evidence confidence · 36% evidence coverage
This score is driven most by 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 percent5 out of 10
Climbing, weighted 25 percent5.5 out of 10
Technicality, weighted 15 percent5.5 out of 10
Accumulated burden, weighted 17 percent4 out of 10
Exposure & support, weighted 13 percent6.3 out of 10
Course analysis
What shapes this race
Expect sustained upland ground and meaningful climbing, forest trail that may change character in wet conditions.
trailmountainforestcoastalmixed
Cutoff analysis
Lower pressure
To finish inside 30h, the raw average required is 18:00 per kilometre (28:59 per mile), including every stop.
Raw pace18:00/km
PressureLower 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.
Exposure & kit
unknown 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.
Latest verification
Trust the source, see the gaps.
Data PartialThe organiser-controlled listing confirms the 14 August 2027 100K product, 14:00 start and £145 entry, while the official FAQ supplies its 30-hour limit. Exact finish date, 100K route, ascent, navigation and aid plan remain unknown; shared 100-mile copy is not inherited.
- 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.
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