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Rhigos Road

6004.0 m · net rise 305.0 m · total ascent 308.3 m · overall 5.1% · confidence: high · Treherbert · Mid Glamorgan · share

Shape: sustained — 31% of the climbing sits in a quarter of the distance.

Matches: 100 Greatest Cycling Climbs (Simon Warren) — The Rhigos, #98; also a Dragon Ride staple — No. 98, as "Rhigos" (official app, 2026 numbering).

≈ Overhead cover (tree canopy or structures) spans 6% of this route — detected by comparing the surface model (DSM, treetops and rooftops) against the terrain model (DTM, bare ground). Under cover the bare-ground model is built from fewer laser returns, so metre-scale readings can wobble; maxima whose window sits in a covered zone are marked ≈ below — less certain — the flag does not say whether the true value is higher or lower. Longer windows average over more clean ground and are steadier.

Gradient ladder what do windows mean?

≈ appears only on the 2–3 m diagnostic rows here, which does not lower the confidence letter: those windows are never headline values or ranking keys, so confidence reflects the standard (5–100 m) windows — which are clean on this climb.

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

Topo (contours) Vector   © 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_14_292201_20210321dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_14_293201_20210321dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_14_294201_20210321dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_20_292202_20220112dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_20_293202_20220112dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_20_294202_20220112dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_5_292198_20201224dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_5_292199_20201224dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_5_292200_20201224dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_5_293198_20201224dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_5_293199_20201224dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_5_293200_20201224dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_5_294198_20201224dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_5_294199_20201224dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_5_294200_20201224dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:11:10+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_14_292201_20210321dtm.tif",
    "wg_del_14_293201_20210321dtm.tif",
    "wg_del_14_294201_20210321dtm.tif",
    "wg_del_20_292202_20220112dtm.tif",
    "wg_del_20_293202_20220112dtm.tif",
    "wg_del_20_294202_20220112dtm.tif",
    "wg_del_5_292198_20201224dtm.tif",
    "wg_del_5_292199_20201224dtm.tif",
    "wg_del_5_292200_20201224dtm.tif",
    "wg_del_5_293198_20201224dtm.tif",
    "wg_del_5_293199_20201224dtm.tif",
    "wg_del_5_293200_20201224dtm.tif",
    "wg_del_5_294198_20201224dtm.tif",
    "wg_del_5_294199_20201224dtm.tif",
    "wg_del_5_294200_20201224dtm.tif"
  ],
  "elevation_capture_dates": [
    "12-01-2022",
    "24-12-2020"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 9.7% over 200 m (Terrain 50), gain 280.4 m over 5500 m way. EXTENDED by graph walk: +2 segment(s) at base, +1 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (notable slice 2026-08-11): big-gain.",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
}