PB potential
- Chiltern Wonderland 50 Ultramarathon
- Unavailable
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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 has the stronger available profile on flat grade share, value score and entry fee.
| 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 |
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.
| Fact | Chiltern Wonderland 50 Ultramarathon | South Downs Way 100 Ultramarathon |
|---|---|---|
| Race date | 2026-09-19 | 2026-06-13 |
| Location | Goring-on-Thames, South East | Winchester to Eastbourne, South East |
| Actual distance | 81 km | 160.9 km |
| RaceIndex mapped route held | Held | Held |
| RaceIndex 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 |
Facts are shown only when they exist in the sourced race record; Not held means no sourced value is held for that race.
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.