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Routes
Mountain biking trails
United Kingdom
Wales
South Wales
Pembrokeshire
Crymych

Preseli Hills & Llys-y-frân dam loop

Moderate

1.0

(1)

1

riders

Preseli Hills & Llys-y-frân dam loop

04:12

53.1km

900m

Mountain biking

Embark on a diverse mountain biking adventure through the Preseli Hills and around Llys-y-frân dam. This moderate route spans 33.0 miles (53.1 km) and features a total elevation gain of 2948 feet (898 metres), offering a rewarding challenge that typically takes around 4 hours and 12 minutes to complete. You'll…

Last updated: April 23, 2026

Tips

Includes a very steep uphill segment

You may need to push your bike.

After 2.95 km for 149 m

Waypoints

A

Start point

Parking

Get Directions

1

7.81 km

Preseli Hilltops Bridleway

Highlight (Segment) • Viewpoint

A wonderfully wild bridleway that runs along the summit ridge of the Preseli hills. Best ridden from west to east so that it's predominantly downhill and much better in dry weather, it gets a bit boggy in the winter.

Tip by

2

12.9 km

Fun, fast gravel track descent.

Tip by

3

15.6 km

Rosebush Quarry

Highlight • Lake

Just off the main track you’ll see a little off road trail. Follow this up onto the ridge for a stunning view of the surrounding area. If you look around …

Tip by

4

23.0 km

Llys y Frân Café

Highlight • Cafe

Cafe serving food, snacks and locally made gifts / food.

Spring Opening Hours (18 February – 31 March):

Monday – Sunday, 10:00am – 4:30pm
Hot food is available between midday …

Tip by

5

32.5 km

Llys y Fran Dam and Reservoir

Highlight • Structure

un-technical off-road loop suitable for mountain bike or cyclocross bike

Tip by

6

46.1 km

Waun Mawn Standing Stones

Highlight • Monument

Waun Mawn (Welsh for "Peat moor") is the location of a possible dismantled Neolithic stone circle. The diameter of the circle is suggested to be 110m. This would make it Britains third largest stone circle.

Tip by

B

53.1 km

End point

Parking

Loading

Way Types & Surfaces

Way Types

28.2 km

13.5 km

9.60 km

1.30 km

584 m

< 100 m

Surfaces

29.6 km

14.8 km

5.42 km

3.14 km

167 m

111 m

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (470 m)

Lowest point (70 m)

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Weather

Powered by Foreca

Monday 18 May

14°C

10°C

82 %

Additional weather tips

Max wind speed: 33.0 km/h

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This route was planned by komoot.

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Frequently Asked Questions

Where can I park to access the Preseli Hills & Llys-y-frân dam loop?

You can typically find parking at the Llys-y-frân activity center, which offers facilities and serves as a good starting point for the loop. For specific details on parking, it's always a good idea to check local council websites like pembrokeshire.gov.uk or tourist information sites like visitpembrokeshire.com.

How challenging is the mountain biking on this route?

This loop is generally considered to be of moderate to hard difficulty, requiring good to very good fitness and advanced riding skills. The Preseli Hills section, especially the 'Golden Road', can be remote and challenging, sometimes requiring you to push your bike. The Llys-y-frân trails offer a range from easy (green) to severe (black), with blue and red trails demanding good to high fitness for their strenuous climbs.

What kind of terrain can I expect on the Preseli Hills & Llys-y-frân dam loop?

You'll encounter a diverse mix of natural and constructed surfaces. The Preseli Hills feature varied terrain, including boggy sections on the 'Golden Road', high-level grassy singletrack, and mossy singletrack. Around Llys-y-frân, the trails are more structured, with asphalt, gravel, and purpose-built mountain biking tracks that include steep descents with loose shale and significant climbs.

What are the main points of interest along the route?

The loop offers several notable sights. You'll ride along the Preseli Hilltops Bridleway, experience a Gravel Descent in Pembrokeshire Coast National Park, pass by Rosebush Quarry, and see the impressive Llys y Fran Dam and Reservoir. Don't miss the ancient Waun Mawn Standing Stones, believed to be the original source of Stonehenge's bluestones.

Is the Preseli Hills & Llys-y-frân dam loop dog-friendly?

While dogs are generally welcome in the Pembrokeshire Coast National Park, it's crucial to keep them under close control, especially in areas with livestock or ground-nesting birds. Always follow the Countryside Code and local signage regarding leash requirements.

What is the best time of year to mountain bike this loop?

The best time is typically during drier months to avoid the boggy sections in the Preseli Hills. Clear days offer spectacular panoramic views, potentially as far as the Wicklow Mountains in Ireland. Be prepared for varied weather, as conditions can change quickly in this exposed landscape.

Are there any permits or entrance fees required for this trail or the Pembrokeshire Coast National Park?

No specific permits or entrance fees are generally required to access the trails within the Pembrokeshire Coast National Park or for this loop. However, some facilities at Llys-y-frân, such as bike hire or specific activities, may have associated costs.

Does this route connect with other notable trails?

Yes, this route incorporates sections of the official National Cycle Network Route 47 (covering about 35% of the tour) and a small portion of the Church Path (around 2%).

Are there facilities available along the trail, especially at Llys-y-frân?

Yes, the Llys-y-frân activity center offers excellent facilities including a visitor center, bike hire (including e-bikes), a pump track, a skills area, and a bike wash. You can also find the Llys y Frân Café there for refreshments.

What makes the riding experience on this loop unique?

This loop offers a unique blend of experiences: it seamlessly combines ancient, natural bridleways with modern, purpose-built mountain bike trails. You get to ride through the 'wild and ancient' Preseli Hills, passing historical sites, and then transition to the structured, amenity-rich environment of Llys-y-frân, all while enjoying dramatic panoramic views.

What should I bring for a mountain bike ride on this loop?

Given the length and varied terrain, you should bring appropriate mountain biking gear, plenty of water and snacks, navigation tools (like the komoot app), a repair kit, and layers of clothing suitable for changing weather conditions. Waterproofs are advisable, especially for the potentially boggy sections in the Preseli Hills.

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Llys-y-Frân Reservoir Cycle Trail

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