PB potential
- Chiltern Wonderland 50 Ultramarathon
- Unavailable
Chiltern Wonderland 50 Ultramarathon vs South Downs Way 100 Ultramarathon
A data-led head-to-head using sourced race facts and available derived figures under one published methodology.
Data current as ofChiltern Wonderland 50 Ultramarathon or South Downs Way 100 Ultramarathon — which comes out ahead?
Chiltern Wonderland 50 Ultramarathon has the stronger available profile on flat grade share, value score and entry fee.
Route comparison snapshot
Chiltern Wonderland 50 Ultramarathon
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 5.0%
- flat grade share
- 38.8% Favoured
- lower ascent
- 1,699 m
- climbing density
- 21.0 m/km
- net elevation
- 5 m
- maximum grade
- 39.0%
South Downs Way 100 Ultramarathon
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 4.1% Favoured
- flat grade share
- 34.7%
- lower ascent
- 3,410 m
- climbing density
- 21.2 m/km
- net elevation
- -94 m
- maximum grade
- 31.8%
| Metric | Chiltern Wonderland 50 Ultramarathon | South Downs Way 100 Ultramarathon |
|---|---|---|
| PB potential | Unavailable | 83/100 |
| Flat grade share | 38.8% ✓ | 34.7% |
| GAP factor (% slower than flat) | 5.0% | 4.1% ✓ |
| Uphill share | 30.7% | 32.7% |
| Steep-up share | 12.7% | 13.3% |
| Downhill share | 30.5% | 32.6% |
| Total ascent (m) | 1,699 m | 3,410 m |
| Climbing density (m/km) | 21.0 m/km | 21.2 m/km |
| Longest climb length (m) | 740 m | 2,970 m |
| Longest climb gain (m) | 78 m | 194 m |
| Longest climb average grade | 10.6% | 6.5% |
| Total descent (m) | 1,694 m | 3,504 m |
| Net elevation (m) | 5 m | -94 m |
| Max absolute grade | 39.0% | 31.8% |
| Start elevation (m) | 43 m | 99 m |
| Finish elevation (m) | 48 m | 5 m |
| Median finish context (s) | Unavailable | 24:53:35 |
| Value | 68/100 ✓ | 48/100 |
| Beginner-friendliness | Unavailable | 66/100 |
| Scenic score | 76/100 | 91/100 ✓ |
| Conditions | Unavailable | 49/100 |
| Entry fee (GBP) | £115 ✓ | £220 |
| Lowest modelled true cost (GBP) | £245 ✓ | £350 |
Flat grade share
- Chiltern Wonderland 50 Ultramarathon
- 38.8% Favoured
GAP factor (% slower than flat)
- South Downs Way 100 Ultramarathon
- 4.1% Favoured
Uphill share
Steep-up share
Downhill share
Total ascent (m)
Climbing density (m/km)
- Chiltern Wonderland 50 Ultramarathon
- 21.0 m/km
- South Downs Way 100 Ultramarathon
- 21.2 m/km
Longest climb length (m)
Longest climb gain (m)
Longest climb average grade
Total descent (m)
Net elevation (m)
Max absolute grade
Start elevation (m)
Finish elevation (m)
Median finish context (s)
- Chiltern Wonderland 50 Ultramarathon
- Unavailable
Value
- Chiltern Wonderland 50 Ultramarathon
- 68/100 Favoured
Beginner-friendliness
- Chiltern Wonderland 50 Ultramarathon
- Unavailable
Scenic score
- South Downs Way 100 Ultramarathon
- 91/100 Favoured
Conditions
- Chiltern Wonderland 50 Ultramarathon
- Unavailable
Entry fee (GBP)
- Chiltern Wonderland 50 Ultramarathon
- £115 Favoured
Lowest modelled true cost (GBP)
- Chiltern Wonderland 50 Ultramarathon
- £245 Favoured
Only metrics available for at least one side are shown. A ✓ marks the better value for each metric (higher-is-better aware). Scores are out of 100 when available. Ascent, climbing density, max absolute grade and median finish describe course or field context and are not marked as better or worse.
Race facts that change the decision
| Fact | Chiltern Wonderland 50 Ultramarathon | South Downs Way 100 Ultramarathon |
|---|---|---|
| Schedule | Exact race date not confirmed. Event weekend starts 2026-09-19 (legacy event-level date). | Exact race date not confirmed. Event weekend starts 2026-06-13 (legacy event-level date). |
| Location | Goring-on-Thames, South East | Winchester to Eastbourne, South East |
| Actual distance | 81 km | 160.9 km |
| raceindex.org mapped route held | Held | Held |
| raceindex.org elevation profile held | Held | Held |
| Course type | Loop | Point To Point |
| Surface | 80% trail, 20% road | Mostly trail (about 85% trail, 15% road) |
| Laps | 1 | Unavailable |
| Elevation character | Hilly | Rolling |
| Terrain | Trail, Mixed | Trail, Road, Track |
| Scenery | Countryside, Riverside, Forest, Historic, Parkland | Countryside, Historic, Forest, Coastal, Riverside |
| Atmosphere | Community, Scenic Tour | Scenic Tour, Destination, Competitive |
| Technicality | Moderate | Moderate |
| Total ascent | 1,699 m | 3,410 m |
| Climbing density | 21.0 m/km | 21.2 m/km |
| Total descent | 1,694 m | 3,504 m |
| Net elevation | 5 m | -94 m |
| Max absolute grade | 39.0% | 31.8% |
| Flat grade share | 38.8% | 34.7% |
| GAP factor | 5.0% | 4.1% |
| Cutoff | 13:00:00 | 30:00:00 |
| Field cap | 250 | 600 |
| Latest finishers | Unavailable | 357 |
| Entry model | Qualifier | Qualifier |
| Entry fee | £115 | £220 |
| Lowest modelled true cost | £245 | £350 |
| Cost model origin | National Average | National Average |
| Measured course | Yes | Unavailable |
Schedule
- Chiltern Wonderland 50 Ultramarathon
Exact race date not confirmed. Event weekend starts 2026-09-19 (legacy event-level date).
- South Downs Way 100 Ultramarathon
Exact race date not confirmed. Event weekend starts 2026-06-13 (legacy event-level date).
Location
- Chiltern Wonderland 50 Ultramarathon
- Goring-on-Thames, South East
- South Downs Way 100 Ultramarathon
- Winchester to Eastbourne, South East
Actual distance
- Chiltern Wonderland 50 Ultramarathon
- 81 km
- South Downs Way 100 Ultramarathon
- 160.9 km
raceindex.org mapped route held
- Chiltern Wonderland 50 Ultramarathon
- Held
- South Downs Way 100 Ultramarathon
- Held
raceindex.org elevation profile held
- Chiltern Wonderland 50 Ultramarathon
- Held
- South Downs Way 100 Ultramarathon
- Held
Course type
- Chiltern Wonderland 50 Ultramarathon
- Loop
- South Downs Way 100 Ultramarathon
- Point To Point
Surface
- Chiltern Wonderland 50 Ultramarathon
- 80% trail, 20% road
- South Downs Way 100 Ultramarathon
- Mostly trail (about 85% trail, 15% road)
Laps
- Chiltern Wonderland 50 Ultramarathon
- 1
- South Downs Way 100 Ultramarathon
- Unavailable
Elevation character
- Chiltern Wonderland 50 Ultramarathon
- Hilly
- South Downs Way 100 Ultramarathon
- Rolling
Terrain
- Chiltern Wonderland 50 Ultramarathon
- Trail, Mixed
- South Downs Way 100 Ultramarathon
- Trail, Road, Track
Scenery
- Chiltern Wonderland 50 Ultramarathon
- Countryside, Riverside, Forest, Historic, Parkland
- South Downs Way 100 Ultramarathon
- Countryside, Historic, Forest, Coastal, Riverside
Atmosphere
- Chiltern Wonderland 50 Ultramarathon
- Community, Scenic Tour
- South Downs Way 100 Ultramarathon
- Scenic Tour, Destination, Competitive
Technicality
- Chiltern Wonderland 50 Ultramarathon
- Moderate
- South Downs Way 100 Ultramarathon
- Moderate
Total ascent
- Chiltern Wonderland 50 Ultramarathon
- 1,699 m
- South Downs Way 100 Ultramarathon
- 3,410 m
Climbing density
- Chiltern Wonderland 50 Ultramarathon
- 21.0 m/km
- South Downs Way 100 Ultramarathon
- 21.2 m/km
Total descent
- Chiltern Wonderland 50 Ultramarathon
- 1,694 m
- South Downs Way 100 Ultramarathon
- 3,504 m
Net elevation
- Chiltern Wonderland 50 Ultramarathon
- 5 m
- South Downs Way 100 Ultramarathon
- -94 m
Max absolute grade
- Chiltern Wonderland 50 Ultramarathon
- 39.0%
- South Downs Way 100 Ultramarathon
- 31.8%
Flat grade share
- Chiltern Wonderland 50 Ultramarathon
- 38.8%
- South Downs Way 100 Ultramarathon
- 34.7%
GAP factor
- Chiltern Wonderland 50 Ultramarathon
- 5.0%
- South Downs Way 100 Ultramarathon
- 4.1%
Cutoff
- Chiltern Wonderland 50 Ultramarathon
- 13:00:00
- South Downs Way 100 Ultramarathon
- 30:00:00
Field cap
- Chiltern Wonderland 50 Ultramarathon
- 250
- South Downs Way 100 Ultramarathon
- 600
Latest finishers
- Chiltern Wonderland 50 Ultramarathon
- Unavailable
- South Downs Way 100 Ultramarathon
- 357
Entry model
- Chiltern Wonderland 50 Ultramarathon
- Qualifier
- South Downs Way 100 Ultramarathon
- Qualifier
Entry fee
- Chiltern Wonderland 50 Ultramarathon
- £115
- South Downs Way 100 Ultramarathon
- £220
Lowest modelled true cost
- Chiltern Wonderland 50 Ultramarathon
- £245
- South Downs Way 100 Ultramarathon
- £350
Cost model origin
- Chiltern Wonderland 50 Ultramarathon
- National Average
- South Downs Way 100 Ultramarathon
- National Average
Measured course
- Chiltern Wonderland 50 Ultramarathon
- Yes
- South Downs Way 100 Ultramarathon
- Unavailable
Facts are shown only when they exist in the sourced race record; Not held means no sourced value is held for that race.
Common questions
Which is flatter, Chiltern Wonderland 50 Ultramarathon or South Downs Way 100 Ultramarathon?
South Downs Way 100 Ultramarathon has the lower GAP factor, making it the flatter course on our route model and more favourable on gradient alone.