Rhigos Road
6004.0 m · gain 305.0 m · overall 5.1% · Tynewydd · Rhondda Cynon Taf
Shape: sustained — 31% of the climbing sits in a quarter of the distance.
Known from: 100 Greatest Cycling Climbs (Simon Warren) — The Rhigos, #98; also a Dragon Ride staple.
≈ 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, not wrong. Longer windows average over more clean ground and are steadier.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | ≈13.5% | 5855–5857 m | under overhead cover |
| 3 m (diagnostic) | 11.4% | 5855–5858 m | |
| 5 m | 10.4% | 4363–4368 m | |
| 10 m | 9.7% | 4361–4371 m | |
| 20 m | 8.9% | 4357–4377 m | |
| 25 m | 8.6% | 4352–4377 m | |
| 50 m | 8.0% | 4326–4376 m | |
| 100 m | 7.4% | 4318–4418 m |
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
© 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."
}