Aber Eiddy to Berea°
1390.5 m · net rise 81.5 m · total ascent 101.6 m · overall 5.9% · confidence: good · Aber Eiddy · Dyfed · share
Shape: sustained — 31% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 76 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.
° The name is provisional: this climb is not yet matched to a documented name, so it was named from nearby map places. There is no evidence of local usage — (auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (51.9303, -5.2076)'). Corrections welcome.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | ≈37% | 396–398 m | under overhead cover terrain reads 114.3% at 189–191 m across a structure — excluded |
| 3 m (diagnostic) | ≈32% | 462–465 m | under overhead cover terrain reads 104.7% at 188–191 m across a structure — excluded |
| 5 m | ≈31% | 462–467 m | under overhead cover terrain reads 93.2% at 186–191 m across a structure — excluded |
| 10 m | ≈24% | 462–472 m | under overhead cover terrain reads 60.5% at 186–196 m across a structure — excluded |
| 20 m | ≈21.0% | 452–472 m | under overhead cover terrain reads 36.3% at 186–206 m across a structure — excluded |
| 25 m | ≈20.2% | 447–472 m | under overhead cover terrain reads 30.4% at 186–211 m across a structure — excluded |
| 50 m | ≈18.0% | 422–472 m | under overhead cover terrain reads 18.2% at 186–236 m across a structure — excluded |
| 100 m | 14.5% | 376–476 m |
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.
Measured, not vetted. This page records what the laser record shows about the road's shape — nothing more. Nobody has necessarily ridden or inspected this road for the survey, and a page here is not a recommendation and no guarantee that the road is open, surfaced, rideable or safe. Gates, private sections, missing rights of way and hazards do not show up in elevation data. Check access and conditions on the ground and make your own judgment.
Ridden it, or know better? Submit data for this climb no account needed · Share this climb
© 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/wales/dtm_1m/wg_del_35_179230_20220127dtm.tif",
"data/cache/wales/dtm_1m/wg_del_35_179231_20220127dtm.tif"
],
"calculated_at": "2026-08-12T02:18:58+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
"osm_pbf_path": "data/cache/pbf/wales-2026-08-11.osm.pbf",
"osm_snapshot": "2026-08-10T20:21:40Z",
"elevation_provider": "Welsh Government",
"elevation_dataset": "Welsh Government LiDAR 1m DTM (2020-2023)",
"elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Crown copyright Welsh Government",
"elevation_catalogue_layer": "geonode:welsh_government_lidar_tile_catalogue_2020_2023",
"elevation_tile_ids": [
"wg_del_35_179230_20220127dtm.tif",
"wg_del_35_179231_20220127dtm.tif"
],
"elevation_capture_dates": [
"27-01-2022"
],
"climb_origin": "discovered",
"notes": "Coarse pass: max 9.0% over 200 m (Terrain 50), gain 61.8 m over 1163 m way. EXTENDED by graph walk: +1 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting.",
"naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (51.9303, -5.2076)'",
"license": "ODbL-1.0",
"license_url": "https://howsteep.org/licensing.html"
}