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Road cycling routes
United Kingdom
Wales
South Wales

Onllwyn

The best road cycling routes around Onllwyn

4.6

(14)

1,315

riders

47

rides

Road cycling routes around Onllwyn are situated in Neath Port Talbot, Wales, offering a base for exploring diverse landscapes. The area, once a mining village, provides views of the Brecon Beacons National Park. Cyclists encounter a mix of semi-rural terrain, rolling hills, and valleys, with routes extending into more mountainous areas. The region is characterized by its transition from an industrial past to a natural setting, featuring varied elevation changes.

Best road cycling routes around Onllwyn

  • The most popular road…

Last updated: June 24, 2026

107

riders

#1.

Resolven Canal Basin – Clyne Locks loop from Glynneath

22.0km

00:55

110m

110m

Easy road ride. Great for any fitness level. Mostly well-paved surfaces and easy to ride.

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Easy

Easy road ride. Great for any fitness level. Mostly well-paved surfaces and easy to ride.

Easy
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Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.

Moderate

Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.

Hard

Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.

Hard
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Popular around Onllwyn

Cycling around Onllwyn

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Tips from the Community

Mark Lewis
June 23, 2025, Resolven Canal Basin

Short walk

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What an absolute gem of a climb. One of my favourites !!!

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Climbing the Bwlch Mountain southwards from Treorchy (A4061) is a classic South Wales Valleys experience, offering a long, steady ascent. The road winds up from the Rhondda valley onto open moorland where the main challenge often becomes the significant exposure to wind. Enjoy the sweeping panoramic views from the top of this popular and rewarding climb.

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It's a neat canal aqueduct over a river

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Starting in the outskirts of Rhigos, this climb takes you past former mining areas and up to the top of Hirwaun Common. The climb passes the fomer Tower Colliery – which used to be the oldest working deep coal mine in the UK but closed in 2008. The climb gives both a feeling of industrial heritage but later the sweeping views of the Hirwaun Common. The first few km are fairly straight but near the summit, there are two switchback hairpins which add an alpine feel to this long-steady climb.

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This is a great section of NCN 4 which crosses over the River Neath parallel to the elevated M4 motorway. It's quite an industrial stretch but the views are great, and the cycle path is segregated from the road.

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Adie
January 18, 2023, Beacons Reservoir

The northernmost and highest of the three reservoirs in the Taff Fawr valley.

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watsy_46
January 11, 2023, Sarn Helen

Riding the Sarn Helen from the start at Ynysygerwn is a technical climb. I would say probably not ride-able on an analogue bike but completely possible by EMTB.

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Frequently Asked Questions

How many road cycling routes are available around Onllwyn?

There are over 50 road cycling routes available around Onllwyn, catering to various skill levels. You'll find a good mix, with 8 easy routes, 28 moderate routes, and 18 difficult routes to explore.

What kind of terrain can I expect when road cycling near Onllwyn?

Road cycling around Onllwyn offers a diverse landscape, transitioning from a semi-rural setting with rolling hills and valleys to more mountainous terrain as you approach the Brecon Beacons National Park. You'll encounter varied elevation changes, from gentle stretches to significant climbs.

Are there road cycling routes suitable for beginners in Onllwyn?

Yes, Onllwyn offers several easy road cycling routes perfect for beginners. One popular option is the Sarn Helen loop from Blaengwrach, which is 21.1 km long and follows parts of the ancient Sarn Helen, offering a gentle ride through the local landscape.

Where can I find challenging road cycling routes near Onllwyn?

For experienced cyclists seeking a challenge, Onllwyn is an excellent base. The region borders the Brecon Beacons National Park, home to iconic climbs like the Black Mountain Road (A4069) and the notoriously steep Devil's Staircase. Within komoot, you can find routes like the Penderyn Moor Climb – Beacons Reservoir loop from Glynneath, a difficult 97.8 km trail with significant elevation changes.

What natural attractions can I see while road cycling around Onllwyn?

The area around Onllwyn is rich in natural beauty. You can cycle through parts of the Brecon Beacons National Park and explore 'Waterfall Country,' home to stunning cascades like Sgwd Yr Eira and Sgwd Uchaf Clun-Gwyn Waterfall. The Fan Gyhirych Summit Trig Point also offers lovely views.

Are there any historical sites or landmarks along the road cycling routes?

Yes, the region has a rich industrial heritage. The Cefn Coed Colliery Museum – Glynneath Hill Climb loop from Seven Sisters passes by historical sites, showcasing the area's past. You might also encounter remnants of the ancient Sarn Helen, a Roman road, on some routes.

What is the best time of year for road cycling in Onllwyn?

The best time for road cycling in Onllwyn is generally from spring to autumn when the weather is milder and more predictable. Summer offers the longest daylight hours, while spring and autumn provide beautiful scenery with fewer crowds. Be prepared for changeable Welsh weather at any time of year.

Are there any circular road cycling routes available?

Yes, many of the road cycling routes around Onllwyn are circular, allowing you to start and end at the same point. For example, the Sarn Helen – Aberdulais Stone Bridge loop from Blaengwrach is a moderate 44.7 km circular route.

What do other road cyclists enjoy the most about road cycling in Onllwyn?

The area is highly rated by the komoot community, with an average score of 4.6 stars from over 15 reviews. Reviewers often praise the diverse terrain, from rolling hills to challenging climbs, and the stunning views of the Brecon Beacons National Park. The blend of natural beauty and historical interest also makes for a unique cycling experience.

Can I find long-distance road cycling routes around Onllwyn?

Absolutely. For those looking for longer rides, routes like the Rhigos Climb Viewpoint – Aberdulais Stone Bridge loop from Seven Sisters offer a substantial challenge, covering over 112 km with significant elevation gain, perfect for endurance training or a full day out.

Are there opportunities for wildlife spotting while road cycling?

Yes, the region around Onllwyn is known for its diverse wildlife. River corridors are important for otters, kingfishers, bats, and dippers, while conifer plantations are home to goshawks, crossbills, and siskins. Keep an eye out for the rare Marsh Fritillary butterfly in suitable habitats, especially during spring and early summer.

Most popular routes around Onllwyn

Easy hikes around Onllwyn

Most popular attractions around Onllwyn

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