Knott Hill Lane
1134.3 m · net rise 114.7 m · total ascent 120.5 m · overall 10.1% · confidence: good · Delph
Shape: sustained — 36% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 110 m.
Found purely from mapping and LiDAR data, and not yet matched against books, race records or lists — it may be well known to locals under a name we've never heard. It was cross-checked against the OS road network, surface models and map tags, but a discovery can still be an artifact of the terrain model or the map. Treat it as a well-evidenced hypothesis until someone has ridden it. If you know this road, tell us what you found — photographs, corrections and local knowledge all welcome; the map links below let you scout it first.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | ≈48% | 384–386 m | under overhead cover terrain reads 70.5% at 446–448 m across a structure — excluded |
| 3 m (diagnostic) | ≈39% | 384–387 m | under overhead cover terrain reads 63.7% at 445–448 m across a structure — excluded |
| 5 m | ≈31% | 454–459 m | under overhead cover terrain reads 52.4% at 445–450 m across a structure — excluded |
| 10 m | ≈28% | 504–514 m | under overhead cover terrain reads 35.8% at 441–451 m across a structure — excluded |
| 20 m | ≈21.5% | 494–514 m | under overhead cover terrain reads 27.1% at 439–459 m across a structure — excluded |
| 25 m | ≈20.5% | 490–515 m | under overhead cover terrain reads 24.7% at 434–459 m across a structure — excluded |
| 50 m | ≈18.9% | 467–517 m | under overhead cover terrain reads 19.9% at 440–490 m across a structure — excluded |
| 100 m | ≈14.8% | 298–398 m | under overhead cover terrain reads 18.4% at 415–515 m across a structure — excluded |
may_start_earlier Extent detection suggests reviewing where this climb starts/ends.
Map
Check this route yourself: Google Maps route via their router · Street View at the base where coverage exists · geojson.io our exact measured line · OpenTopoMap
This climb's data: OCL JSON — the full gradient ladder, quality flags and provenance in the OpenClimb Ladder format.
Ridden it, or know better? Submit data for this climb no account needed
© OpenStreetMap contributors · topo tiles © OpenTopoMap (CC-BY-SA) · vector tiles OpenFreeMap
Profile
Provenance
{
"analysis_version": "0.1.0",
"sample_interval_m": 1.0,
"interpolation": "bilinear",
"smoothing": "none",
"gradient_windows_m": [
5.0,
10.0,
20.0,
25.0,
50.0,
100.0
],
"diagnostic_windows_m": [
2.0,
3.0
],
"elevation_crs": "EPSG:27700",
"elevation_resolution_m": 1.0,
"elevation_tiles": [
"data/cache/england/bulk_dtm_1m/SD9505.tif"
],
"calculated_at": "2026-08-19T18:38:47+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
"osm_pbf_path": "data/cache/pbf/england-2026-08-12.osm.pbf",
"osm_snapshot": "2026-08-12T20:21:46Z",
"elevation_provider": "Environment Agency",
"elevation_dataset": "EA LIDAR Composite DTM 1m (2022)",
"elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Environment Agency",
"elevation_coverage_id": "13787b9a-26a4-4775-8523-806d13af58fc__Lidar_Composite_Elevation_DTM_1m",
"elevation_tile_ids": [
"SD9505.tif"
],
"climb_origin": "discovered",
"notes": "Coarse pass: max 8.9% over 200 m (Terrain 50), gain 22.8 m over 276 m way. EXTENDED by graph walk: +5 segment(s) at base, +3 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 1 overlapping proposal(s): knott-hill-lane-2 ADOPTED (England launch slice 2026-08-16): clean-steep."
}