Road Rides from Trasvía — 15

Weather, the weekday box & the smart order

The four days

The window: Saturday afternoon to a ~17:00 departure on Tuesday 18. Weekday rule — rolling as early as 06:00, home by 15:00; that box fits everything except the big days, which need the one full day: Sunday. Forecast: AEMET, refreshed 14 Aug 21:03.

Sat 15 Aug Holiday · PM only

20–25 °C · storms/rain to midday, drying 12–18 (25%)
shower risk returns evening (60%)
wind NW 15 km/h · sun 07:21–21:22

Afternoon opener. Once the roads dry (~13:00): the Carmona loop (3–4 h) — inland and empty while the holiday coast is jammed — or the Ruiloba Ring if the sky looks short. Shops are shut today.

Sun 16 Aug

20–25 °C · light rain likely before midday (80%), clearing after (20%)
wind N 10 km/h · sun 07:22–21:21

The whole-day ride. Fuente Dé, Piedrasluengas, or Ozalba + Hoz. The morning rain is forecast escasa (light) — roll by 08:00 anyway; the afternoon dries.

Mon 17 Aug

19–26 °C · rain 65% before midday, 0% after
wind NE 15 km/h · sun 07:23–21:19

The gamble morning. If dawn is dry, Palombera fits the 06:30→15:00 box with margin. If the early showers land, wait them out and take the Fuentona Espresso Run or East Rollers from ~10:00.

Tue 18 Aug Home by 15:00

19–25 °C · rain 10% — best sky of the window
wind NE 20 km/h (breezy) · sun 07:24–21:18

Best forecast, last morning (departure ~17:00). Carmona or Palombera on a 06:30 start; Ozalba + Hoz only if rolling by 06:00 — it gets home ~13:30.

Forecast is a snapshot — recheck at AEMET Comillas (id 39024) each morning, and the gorge road status at obrasn621.es before any Picos ride.

150–170 km · the Picos & Liébana

Big days

Every big day funnels through the Desfiladero de La Hermida — 20 km of limestone gorge on the N-621, rebuilt and widened for cyclists in works finished summer 2025, with no closures in force on 14 Aug. Lights for the short tunnels, early starts to beat the tourist wave. These need the full day — with the 15:00 weekday ceiling, they're Sunday rides.

Queen stage · out-and-back

Fuente Dé

The Vuelta's road into the Picos: the full gorge to Potes, then 22.7 km up the Liébana to the cable-car wall where Contador sealed the 2012 Vuelta.

≈170km

≈2,400m+

7–9h riding est.

9.1%max

Schematic profile, one-way · totals are estimates

CA-131 → N-634 → N-621 → CA-185

Key climb	Potes → Fuente Dé: 22.7 km · 809 m+ · 3.6% avg · 9.1% max — easy to Espinama, then the ramp (climbfinder)
Totals	≈170 km · ≈2,300–2,600 m+ Estimate
Fuel	San Vicente, Panes, Potes (towns). Cafetería at the Fuente Dé cable-car base Confirmed (t. 942 736 610). Espinama / La Hermida bars Unconfirmed
Best day	Sun 16 The only day long enough. Roll by 08:00 to beat the gorge wave.

Lights required: short tunnels in the gorge — front white + rear red is the law in tunnels.
Gorge traffic triples in summer (baseline ~2,500 vehicles/day) — start ≤08:00 and be back through the narrows before the midday wave. Fuente Dé is the busiest climb here (rider votes: "ok", not "great"); mornings are calmer.
Good news The 17.2 km widening of the gorge road was finished summer 2025, explicitly built to make the road usable by cyclists — pull-outs and wider carriageway throughout.

Verified 14 Aug 2026 · climbfinder · transportes.gob.es (works complete) · telefericodefuentede.com · obrasn621.es (no cuts)

Alternative queen stage · loop

Piedrasluengas Loop

Maximum climbing: the gorge to Potes, 28.8 km up to the Palencia border at 1,354 m, then home down the empty Polaciones and Tudanca reaches of the upper Nansa.

≈170km

≈2,800m+

7½–9½h riding est.

10.1%max

Schematic profile · totals are estimates

CA-131 → N-621 → CA-184 → CA-281 → CA-181 → CA-131

Key climb	Ojedo → Piedrasluengas: 28.8 km · 1,077 m+ · 3.7% avg · 6.7% max (climbfinder — it labels the road "CA-627"; that ref starts at the Palencia border, the Cantabrian road is the CA-184)
Descent	CA-281 north — the reverse of a 37.4 km / 1,188 m climb, so expect real counter-climbs on the way down
Totals	≈170 km · ≈2,600–3,000 m+ Estimate
Fuel	Gap No verified services for ~70 km between Ojedo and Puentenansa — load full bottles and food in Potes. Tudanca / Piedrasluengas bars Unconfirmed
Best day	Sun 16 Needs the full day.

CA-281 is narrow, remote and near-empty (rider traffic votes 100% "great") — carry tools, tube, wind layer; phone coverage in Polaciones patchy Unconfirmed.
1,354 m pass — check the sky before committing; it's a long way from shelter.

Verified 14 Aug 2026 · climbfinder (Ojedo) · climbfinder (Puentenansa) · cyclefiesta cross-check

Hardest climb in range · out-and-back · Asturias

Sotres — Jitu de Escarandi

Up the Cares valley to Poncebos, then 14.9 km at 7.6% to the pass above Sotres — the toughest ascent within riding distance, with the roughest tarmac.

≈150km

≈2,400m+

6½–8½h riding est.

~17%max

Schematic profile · totals are estimates

CA-131 → N-621 → AS-114 → AS-264 → CA-1 (Cabrales)

Key climb	Poncebos → Jitu de Escarandi: 14.9 km · 1,129 m+ · 7.6% avg · ~17% max — the hardest climb in this book (climbfinder)
Surface	Care Last ~2 km before Sotres: up to 16% on broken, pitted tarmac — road-bike passable, pick your line
Totals	≈150 km · ≈2,300–2,600 m+ Estimate
Fuel	Panes, Arenas de Cabrales (towns); Sotres bars Unconfirmed

Sunday only Needs the full day — and the AS-264 below Poncebos is the only road to the Cares gorge walk: near-saturation car traffic and parked cars in mid-August. If Sunday is the big day, this one waits for another trip.
Short rock tunnels above Poncebos — lights.

Verified 14 Aug 2026 · climbfinder

78–120 km · the Nansa & Saja valleys

Cols & loops

The middle distances, on roads rider votes call near-empty. This is the network to use on the holiday, when the coast and the Picos funnel are full.

Two cols · loop

Ozalba + Hoz

Up the Nansa, over two near-traffic-free cols on the CA-282, then a twelve-hairpin drop into the most dramatic half of the La Hermida gorge — ridden downhill-trending toward Panes.

≈120km

≈1,850m+

5–6½h riding est.

13.2%max

Schematic profile · totals are estimates

CA-131 → N-634 → CA-181 → CA-282 → N-621 → CA-131

Climb 1	Puentenansa → Collado de Ozalba: 5.9 km · 397 m+ · 6.7% avg · 11.4% max, 7 hairpins (climbfinder)
Climb 2	Sobrelapeña → Collado de la Hoz: 7.7 km · 440 m+ · 5.7% avg · 13.2% max (climbfinder)
Totals	≈120 km · ≈1,700–2,000 m+ Estimate
Fuel	San Vicente, Panes (towns); Puentenansa / La Hermida bars Unconfirmed
Best day	Sun 16 as the shorter big day, or Tue 18 rolling by 06:00 — home ~13:30, inside the 15:00 cut-off. Either way the gorge leg wants a pre-midday passage.

The CA-282 is remote and near-empty — full mechanical self-sufficiency.
Brake check before the 12-hairpin west descent of the Hoz; then lights for the gorge tunnels, and expect N-621 traffic building from mid-morning.

Verified 14 Aug 2026 · climbfinder (Ozalba) · climbfinder (Hoz W) · climbfinder (Hoz E)

High pass · out-and-back

Puerto de Palombera

16.6 km of steady beech-forest climbing through the Saja-Besaya park to 1,257 m — twelve hairpins, almost no cars, cattle above the treeline.

≈100km

≈1,650m+

4–5½h riding est.

7.7%max

Schematic profile · totals are estimates

CA-135 → CA-180 → CA-280 (+ CA-817 spur)

Key climb	Saja → Palombera: 16.6 km · 820 m+ · 4.9% avg · 7.7% max, 12 hairpins (climbfinder)
Double option	Drop 6 km to Espinilla and re-climb the south side: 6.0 km · 5.5% · 9.6% max, +≈330 m+ (climbfinder)
Spur	Bárcena Mayor on the paved CA-817: +≈11 km round trip — see the valley ride
Totals	≈100 km · ≈1,500–1,800 m+ Estimate
Fuel	Cabezón de la Sal (town). Nothing at the pass — two bottles. Saja bar Unconfirmed

Free-roaming cattle on the open upper slopes — give them room, especially descending.
Surface voted "ok" rather than great — watch the fast hairpins.
Fits the weekday box with margin: 06:30 start → home before 14:00. Also the strongest Mon/Tue pick.

Verified 14 Aug 2026 · climbfinder (Saja) · climbfinder (Espinilla) · dangerousroads (fully paved, 1,260 m)

Ex-Vuelta col · loop · holiday-proof

Collada de Carmona

The compact classic: up the Saja to Valle de Cabuérniga, over the steep side of the col past Carmona's stone casonas, and home down the Nansa.

≈78km

≈1,100m+

3–4h riding est.

10.5%max

Schematic profile · totals are estimates

CA-135 → CA-180 → CA-182 → CA-181 → CA-131

Key climb	Valle de Cabuérniga → Collada de Carmona: 4.8 km · 350 m+ · 7.4% avg · 10.5% max, 3 hairpins (climbfinder; cross-check 4.9 km / 351 m / 7.2% at cyclefiesta)
Ridden reversed	Puentenansa side: 10.4 km · 446 m+ · 4.3% avg · 10.9% max (climbfinder)
Totals	≈78 km · ≈1,000–1,200 m+ Estimate
Fuel	Cabezón de la Sal (town); Carmona / Puentenansa bars Unconfirmed
Best day	Sat 15 PM The holiday-proof afternoon opener (3–4 h from a ~13:00 start) — rider traffic votes 100% "great" (near-empty). Also an easy fit for any weekday morning.

Carmona village is worth five minutes off the bike — one of the best-kept montañesa villages in Cantabria.
Very good surface on the climb (cyclefiesta).

Verified 14 Aug 2026 · climbfinder · cyclefiesta

58–72 km · rollers & recovery

Coast & valley

Shorter days that still bite — the coast here is never flat. All three fit a morning, and all three end at the beach below the house.

Coast west · loop · into Asturias

Three Rías

Over the Oyambre dunes to San Vicente's 28-arch bridge, into Asturias past the indiano mansions of Colombres, and back around the Pechón peninsula between two rías.

≈72km

≈1,050m+

2½–3½h riding est.

Schematic profile · totals are estimates

CA-131 → N-634 → local (Bustio) → CA-380 → N-634 → CA-131

Stops	Mirador de Gerra — the San Vicente-with-Picos postcard, right on the CA-131; Puente de la Maza (28 arches, 15th c.); Colombres & the Archivo de Indianos; Bustio harbour Unconfirmed
Totals	≈72 km · ≈1,050 m+ Estimate
Fuel	San Vicente, Unquera (towns); Colombres Unconfirmed

Pinch CA-131 west of Comillas has barely any shoulder (the town's own words) — a 2.5 km shared-use path parallels it to the La Rabia bridge; ride it gently among walkers, or take the lane early morning.
Don't follow komoot's "circular" here blindly — it includes ~0.9 km unpaved. Stay on CA-131 / N-634.
Unquera → Colombres is a real climb, not a roller. Beach traffic swells the coast road on the 15th.

Verified 14 Aug 2026 · comillas.es (shoulder + path) · komoot anchor 47.3 km / 790 m

Coast east · loop

East Rollers

Short, spiky, and full of excuses to stop: Trappist cheese at Cóbreces, lemon trees in Novales, medieval Santillana — skirted, not cobbled — and the Suances headland.

≈58km

≈950m+

2–3h riding est.

Schematic profile · totals are estimates

CA-131 → CA-352 → CA-353 → CA-131 → CA-351 → CA-132 → CA-341 → local (Ubiarco)

Stops	Abadía de Viaceli, Cóbreces — the monks sell Queso Trapa at the door; Novales, the lemon village; Altamira spur (CA-134, 1.7 km); Santa Justa cliff chapel, Ubiarco Unconfirmed
Totals	≈58 km · ≈950 m+ Estimate
Fuel	Cóbreces, Santillana, Suances (towns)

Cobbles Santillana's core is cobbled and closed to traffic — stay on the CA-131 edge or the CA-136 bypass and walk in if you want the Colegiata. Comillas old town is cobbled too.
August car traffic stacks up on the Santillana/Altamira approaches — the inner parallels CA-353 / CA-354 are the quiet options.

Verified 14 Aug 2026 · Cantabria road catalogue · CA-136 bypass · monasterioviaceli.com

Valley · out-and-back

Cabuérniga & Bárcena Mayor

The soft option that doesn't feel soft: up the Saja valley floor past the Fuentona spring at Ruente to the stone village of Bárcena Mayor.

≈68km

≈800m+

2½–3½h riding est.

Schematic profile · totals are estimates

CA-135 → CA-180 → CA-280 → CA-817

Stops	La Fuentona de Ruente — intermittent karst spring beside the 9-arch bridge; Bárcena Mayor, on the Pueblos Más Bonitos list
Access	Confirmed Bárcena Mayor is residents-only for vehicles — leave the bike at the entrance and walk the stone streets
Totals	≈68 km · ≈800 m+ Estimate · CA-817 paved, confirmed
Fuel	Cabezón de la Sal (town); village restaurants at Bárcena Mayor; Ruente bars Unconfirmed

CA-817 is narrow with blind bends (rider report) — and it's a honeypot: expect car traffic midday, worst Sat 15.

Verified 14 Aug 2026 · Bárcena Mayor (access + paved) · lospueblosmasbonitos · turicantabria

24–35 km · under two hours

Short & sharp

For the rain-delayed morning, the pre-departure spin, or the second ride of a day. All three start rolling from the door and none needs a café stop to justify itself — though each has one.

Coast west · out-and-back

Postcard Run

Out past the Oyambre dunes to the Mirador de Gerra — the San Vicente-with-Picos view — down to the 28-arch bridge, coffee, and home.

≈30km

≈350m+

1–1½h riding est.

Schematic profile · totals are estimates

CA-131 → N-634 → back

Stops	Mirador de Gerra (right on the CA-131); Puente de la Maza; cafés in San Vicente (town)
Totals	≈30 km · ≈350 m+ Estimate

Same CA-131 shoulder pinch west of Comillas as the Three Rías — the 2.5 km shared-use path parallels it; gentle riding among walkers.

Verified 14 Aug 2026 · Mirador de Gerra · comillas.es (path)

The village of Cóbreces with its abbey church towers — Photo: Juan José Hernández Rodríguez · CC BY 2.0 · Commons

Coast east · loop

Ruiloba Ring

The hour of power: rollers to Cóbreces, cheese at the abbey door if the timing works, then the quiet CA-359 inland and a fast drop home on the CA-135.

≈24km

≈400m+

~1h riding est.

Schematic profile · totals are estimates

CA-131 → CA-359 → CA-135

Stops	Abadía de Viaceli Queso Trapa shop, Cóbreces
Totals	≈24 km · ≈400 m+ Estimate · CA-359 Liandres–Peñacastillo is catalogue-verified (4.2 km)

Verified 14 Aug 2026 · Cantabria road catalogue · monasterioviaceli.com

Valley · out-and-back

Fuentona Espresso Run

The rain-dodger: inland up the CA-135 and the valley road to Ruente's karst spring and 9-arch bridge, coffee, and back with the legs still fresh.

≈35km

≈350m+

1¼–1¾h riding est.

Schematic profile · totals are estimates

CA-135 → CA-180 → back

Stops	La Fuentona de Ruente — the intermittent spring beside the medieval bridge; Ruente bars Unconfirmed, Cabezón de la Sal is a full town
Totals	≈35 km · ≈350 m+ Estimate

First 17 km of the Cabuérniga ride — extend to Bárcena Mayor any time the clock allows.

Verified 14 Aug 2026 · turicantabria · road catalogue

Every verified ascent in reach

The col collection

All stats fetched from the linked pages on 14 Aug 2026. Note: climbfinder labels the Ojedo side of Piedrasluengas "CA-627" — that ref begins at the Palencia border; the Cantabrian road is the CA-184.

Climb	From	Road	Km	M+	Avg	Max	Source
Collada de Carmona	Valle de Cabuérniga (E)	CA-182	4.8	350	7.4%	10.5%	climbfinder
Collada de Carmona	Puentenansa (W)	CA-182	10.4	446	4.3%	10.9%	climbfinder
Collado de Ozalba	Puentenansa	CA-282	5.9	397	6.7%	11.4%	climbfinder
Collado de la Hoz	La Hermida (W)	CA-282	10.6	567	5.4%	9.8%	climbfinder
Collado de la Hoz	Sobrelapeña (E)	CA-282	7.7	440	5.7%	13.2%	climbfinder
Puerto de Palombera	Saja (N)	CA-280	16.6	820	4.9%	7.7%	climbfinder
Puerto de Palombera	Espinilla (S)	CA-280	6.0	330	5.5%	9.6%	climbfinder
Fuente Dé	Potes	CA-185	22.7	809	3.6%	9.1%	climbfinder
Puerto de Piedrasluengas	Ojedo	CA-184	28.8	1,077	3.7%	6.7%	climbfinder
Puerto de Piedrasluengas	Puentenansa	CA-281	37.4	1,188	3.2%	10.1%	climbfinder
Jitu de Escarandi (Sotres)	Poncebos	AS-264 / CA-1	14.9	1,129	7.6%	~17%	climbfinder
Puerto de San Glorio	Potes	N-621	26.5	1,308	4.9%	~9%	climbfinder

San Glorio's summit is ~90 km from the door — monster-day (180+ km) territory only, listed for reference.

Mechanics, rental, roads & events

Logistics

Workshops & rental

If the bike breaks

No confirmed walk-in road-bike rental exists in the Comillas–Santander corridor. The only confirmed road rental (Cycle Classic Tours, Cube carbon, 105–126 EUR/3 days, delivered) needs a 3-day lead and a 3-day minimum — not bookable for this window. Bring your own bike; the list below is for repairs.

Shop	Where	Good for	Hours Fri 14 – Sun 16	Phone
Kronos Bike (site)	Torrelavega (Torres), 30 km / 27 min drive — at the A-8 edge, reachable without the fiesta centre	Best bet Shimano Service Center for Cantabria — road repair & spares	Fri 08:30–20:30 · Sat 15 Holiday — call · Sun closed	+34 942 881 328
eCantabria Bike (site)	Cabezón de la Sal, 14 km / 16 min	Nearest workshop — e-bike/MTB specialist, emergency fixes	Fri 10:00–13:30 + 17:00–20:00 · Sat normally 09:30–14:00, 15 Aug Call	+34 623 539 120
Bike Sport (listing)	Santander, 54 km / 45 min	Road sales + repair; "rental" listed, type Unconfirmed	Fri 10:00–13:30 + 16:30–20:30 · Sat/Sun Call	+34 942 34 00 08
Besaya Bike (listing)	Torrelavega, ~29 km Estimate	Orbea dealer, sales + repairs	Fri 09:30–13:15 + 16:00–20:00 · Sat 15 Call · Sun closed	+34 942 888 400
2 Ruedas (site)	Santander, 55 km	Repair + high-end parts; rental is e-MTB only	Call	+34 659 03 01 08
Enbicia (site)	Comillas, 3 km	E-bike rental only — no road bikes, no advertised workshop	WhatsApp	+34 691 45 31 06

Sat 15 Aug is a national holiday — assume every shop is shut unless a phone call says otherwise. San Vicente de la Barquera has no bike shop at all (none found in any directory).

Verified 14 Aug 2026 · driving distances via OSRM from Trasvía · cctbikerental.com · shop sources linked in-table

Roads & events status

What's open, what's jammed

Open La Hermida gorge (N-621): no traffic cuts in force 14 Aug (official works site live feed). A March 2026 rockfall at the Panes entrance was cleared; rockfall risk is inherent — recheck obrasn621.es the morning of any gorge ride.
Unconfirmed CA-131, CA-135, CA-180, CA-182, CA-280, N-634: no roadworks found in searches, but the regional live-status site was unreachable. DGT's live map needs a browser: infocar.dgt.es/etraffic.
Avoid Torrelavega centre, 13–23 Aug: Virgen Grande fiestas — street closures and saturated approaches, worst Sat 15 (music stages 13:00–24:00).
La Vuelta 2026 starts 22 Aug in Monaco — nowhere near Cantabria this weekend, and no local race or cicloturista was found on these roads for 14–16 Aug.
Maybe San Vicente may hold Asunción/San Roque fiestas 14–16 Aug (sources conflict) — expect crowds either way; tourist office +34 942 71 00 12.

Verified 14 Aug 2026 · obrasn621.es · torrelavega.es · lavuelta.es · aytosanvicentedelabarquera.es

DGT — in force this window

Rules of the road

Helmet: compulsory on interurban roads (exceptions: prolonged climbs, extreme heat, medical grounds).
Two abreast is legal on the open road — single out on blind curves and when traffic stacks up.
Being passed: drivers owe you ≥1.5 m, a full lane change on multi-lane roads, and a 20 km/h speed reduction — ride assuming they don't know this.
Shoulder: use the arcén where it exists and is rideable; otherwise take what carriageway you need.
Tunnels & night: front white + rear red lights, and a reflective garment visible at 150 m on interurban roads — the gorge tunnels count as tunnels.
Emergencies: 112.

Verified 14 Aug 2026 · DGT: 20 normas para ciclistas · DGT: en bicicleta · A rules update (RD 23 Jun 2026) takes effect 1 Oct 2026 — not this window.

Everything checked, 14 Aug 2026

Sources

Climb stats — climbfinder.com, fetched per-climb 14 Aug 2026: Carmona E, Carmona W, Ozalba, Hoz W, Hoz E, Palombera N, Palombera S, Fuente Dé, Piedrasluengas (Ojedo), Piedrasluengas (Puentenansa), Sotres, San Glorio
Cross-checks — cyclefiesta (Carmona), cyclefiesta (Piedrasluengas), dangerousroads (Palombera)
Road catalogue (all CA-refs) — red primaria, red local, CA-131; "CA-131a" does not exist in the catalogue and is not used here
La Hermida gorge — obrasn621.es live status (no cuts, 14 Aug), works complete, summer 2025, ministry blog (traffic ×3 in summer)
Comillas cycle path & CA-131 shoulder — comillas.es
Santillana bypass — CA-136 variante; cobbled core — northernspaintravel
Bárcena Mayor — access & paved CA-817, pueblos más bonitos; Fuentona — turicantabria
Weather — AEMET Comillas id 39024 (snapshot elaborated 14 Aug 09:05); sun times — sunrise-sunset.org
Shops — kronosbike.com, ecantabriabike.com, Bike Sport listing, Besaya Bike listing, dosruedassantander.es, enbiciacomillas.com, cctbikerental.com
Events — Torrelavega Virgen Grande, programme, La Vuelta 2026 route, San Vicente fiestas, conflicting aggregator
Rules — DGT 20 normas, DGT en bicicleta, RD June 2026 (effective 1 Oct); 112 — 112.cantabria.es
Mirador de Gerra — enbiciacomillas; Colombres — archivodeindianos.es; Fuente Dé cafeteria — telefericodefuentede.com
Photos — Wikimedia Commons, hotlinked at the 960px bucket, each verified HTTP 200 on 14 Aug 2026; authors and licenses credited on every image, file pages linked in captions