A rider on a gravel track high above a reservoir in the Bannau Brycheiniog

Returns August 2028 · Details late 2027

Mountains of the Merfynion

For drop-bar bikes that don’t know their place.

A lap of Wales on forestry gravel, grassy ridges, rocky bridleways, knee-deep fords and some very good tarmac in between. Not a gravel race so much as a beautiful obstacle course. Nobody has finished with dry feet.

~700 km distance~14,000 m climbing65% tarmac, 35% notFive days to finish
Bannau Brycheiniog, Mountains of the Merfynion 2025

The event

A beautiful obstacle course, by bike

Calling this a gravel event is slightly misleading. There is sumptuous gravel in it, but it is better thought of as a very beautiful, somewhat tortuous obstacle course: a lap of Wales of around 700 kilometres with 14,000 metres of climbing.

With everything from hike-a-bike and singletrack to smooth forestry tracks and sweeping tarmac, it is for people who want to take drop-bar bikes where they don’t belong. The tough stuff is kept short and sharp, linking less technical road and gravel, but there is a lot of it and the climbing never really stops.

It runs from Llwyn Celyn, a medieval farmstead near Abergavenny, where the bunkhouse is yours for the week and there is a hot meal waiting when you get back.

A rider on a moorland track above the valleys at dusk near Rhigos
Black Mountains, Mountains of the Merfynion

Who this event is for

You’ll walk. Everyone walks.

The riding isn’t technical, but it is relentless, remote and exposed. We’d rather you had some off-road miles in your legs before you start.

That said, riders with practically no gravel experience have finished, by being honest about it and riding within themselves. One of them told our roving reporter “don’t tell Rob, but this is going well for my first gravel ride”. She told everyone. We gave him an award.

The route is around 65% tarmac by distance, not by time. Forty to fifty millimetre tyres are the sweet spot. You’ll carry a bivvy and a proper sleep system because the hills don’t care about your hotel booking. The finish rate was 87.5% in 2026, our best ever, which says more about the riders than the route.

Two riders on a wet gravel track across open moorland
A flooded track, Mountains of the Merfynion

“What an awesome and challenging route that was. So glad I decided to give it a go this year. Pasta at the end was one of the highlights.”

Finisher, Mountains of the Merfynion

The route

A lap of Wales, clockwise-ish

Based on the 2025 and 2026 loop from Llwyn Celyn. Provisional for 2028.

Base camp

Llwyn Celyn

A medieval farmstead in the Llanthony Valley near Abergavenny. Registration in the threshing barn; the bunkhouse is ours for the week, with bunks, showers and a hot meal for anyone finishing, whatever the hour. Thirty minutes by bike from Abergavenny station.

The whitewashed farmhouse at Llwyn Celyn in the Llanthony Valley

The warm-up

Into the Bannau Brycheiniog

The route starts in the foothills of the Black Mountains but heads for the Bannau Brycheiniog by way of the South Wales Valleys. The Tumble warms the legs on quiet lanes, then the hills rarely relent all the way to the ridge above Talybont Reservoir and the first checkpoint. Every surface is here, from rocky singletrack to smooth rail trail.

A rider among the gorse on the ridge above Talybont Reservoir

Up, down, repeat

Out of the Bannau Brycheiniog

The hills come thick and fast as the route drops almost to the coast and back into the Valleys, including a stretch of exposed singletrack with panoramic views above Rhigos. You leave the national park over the Devil’s Elbow, which we’ve “improved” with a gravel finish on a section of Sarn Helen.

A rider splashing through a puddle on a gravel track near the Devil’s Elbow

The wild bit

The Western Cambrians and the Welsh desert

After Llandovery comes the wildest, remotest part of the route: a chain of reservoirs on fast forestry gravel and beautiful country roads. A few rockier sections and some fords, especially the knee-deep one before Nant-y-Moch, keep you on your toes. Resupply is scarce and the terrain never stops going up and down. Central Wales at its absolute best.

A rider on the gravel road along the Claerwen reservoir

The slow bit, which is also the best bit

Into Eryri

A fast descent to Machynlleth, then the route shadows the coast along grassy ridges and rocky tracks with views of sea, mountains and estuary. Slow going and, for many, the highlight. After the Penmaenpool toll bridge it’s mostly peaceful lanes linked by forestry gravel, but a run of tough and beautiful passes means the respite is short.

A rider photographing the view over the Mawddach estuary from Cregennan

Heather and wind farms

Out of Eryri

From Bala you climb towards the Hirnant Pass, then switch to gravel before the top for an exposed track over a procession of heather-topped peaks, with views back to Eryri. Leaving the mountains behind doesn’t mean flat: the route crosses hilltop wind farms with very little level ground.

An exposed gravel track across the hills in evening light

Forgotten tracks

Back across the Eastern Cambrians

The return leg heads back into the Cambrians. This side is more farmland than wilderness, but the riding is just as tough: a string of quiet valleys, then gravel over an exposed hilltop, with varied surfaces, some hike-a-bike and tracks even the locals have forgotten about.

A rider on a grassy track between the gorse near Builth Wells

The sting in the tail

The Black Mountains

Just as the landscape flattens and England beckons, the biggest challenge rears up. Tarmac, then a grassy bridleway to within 50 metres of the summit, then a maze of sheep tracks and endless views of the land 600 metres below, if it isn’t pitch black or in cloud. Mostly rideable down. Then back to the bunkhouse for pasta.

A rider climbing the grassy bridleway up Hay Bluff
Two riders on a gravel track beside Claerwen reservoir in evening light

Good Welsh cycling continues long after the roads end.

Claerwen, Mountains of the Merfynion

The route map

Provisional route

This is the 2026 loop and it is provisional for 2028. The final GPX arrives about six weeks before the start.

The essentials

Dates, places, numbers

Next editionAugust 2028. Details late 2027.
BaseLlwyn Celyn, near Abergavenny
Distance / climbing~700 km / ~14,000 m
SurfaceAbout 65% tarmac, the rest gravel, grass, rock and the odd ford
Time limitFive days
Mandatory kitBivvy bag, sleeping bag or hooded down jacket, working phone
EntriesCapped at 40, first come
TrainsAbergavenny, 30 minutes by bike

What your entry includes

And what it pays for

  • Entry, GPX route file and a detailed rider manual six to eight weeks out
  • Live GPS tracking throughout, tracker included
  • Registration and start at the Llwyn Celyn threshing barn
  • A bunk, a shower and a hot meal when you finish
  • A numbered cotton cycling cap in that year’s design
  • A t-shirt, stamped if you finish
  • Copies of every photo we take of you, for personal use
  • Carbon offsetting for the event’s emissions
  • £75 off a Zolla wheelset
  • A meal paid forward via The Long Table

Most of the fee goes on coverage: the people on the road, their accommodation and transport. Where the money goes.

The finish

A bunk, a shower, a hot meal

The bunkhouse is the finish line. Roll into the yard, hand over your tracker, get your stamp and sit down to the pasta that several finishers have described as the highlight of the week.

There are spare bunks for anyone arriving late, and most people stay the night rather than face a drive. By breakfast you’ll be swapping stories with people whose dots you were chasing two days earlier.

A smiling rider arriving at the finish at Llwyn Celyn in the dark before dawn
The finish at Llwyn Celyn

Follow along

Half the fun is watching the dots

Your family will know where you are, what you ate in Rhayader and what you said about the hill afterwards.

1

Live tracking

Every rider carries a GPS tracker from Follow My Challenge. Watch the map, check the leaderboard, send a message to a dot you care about.

2

Commentary

A volunteer commentator writes the story of each day on DotWatcher. Expect weather, food and the occasional lamb rescue.

3

From the roadside

Our roving reporters post photos and updates from the route several times a day. Everyone gets found at least once.

Questions

Things people ask

What does unsupported mean?

It means that you can make use of any publicly available commercial facilities during your ride, e.g. shops and hotels. Or you can use items that you brought with you from the start. You cannot rely on any help that would not be available to all riders, e.g. staying with friends, assistance from other riders or supply stashes.

What tyres do you recommend?

Most of the original recce rides were on 35mm gravel tyres, but more recent recces have been on 45mm and we would recommend 40-50mm ideally. That gives you more comfort without sacrificing speed, so it’s probably the sweet spot. Head into MTB tyre territory and you’ll find the road sections slow going (but very comfy elsewhere). Go below 35mm or opt for very slick treads and you’ll struggle on the rougher sections.

Why have you included an additional minimum kit requirement?

The route is remote and exposed in places, and accommodation options are very limited. Whilst you are never that far from civilisation as the crow flies, you will be riding a bike, not a crow. In case the weather changes for the worse or you have a serious mechanical, we think it’s important you have enough kit to survive. This is an absolute minimum, not a kit list. We don’t think the best strategy for this route is to ride with as little kit as possible.

Is off-road riding experience required?

Given the tough and exposed nature of the route, we wouldn’t recommend entering if you have little experience riding off road. Having said that, we have had riders in 2023 and 2025 with practically no off-road experience who were open about it, rode within their ability and finished. Generally this isn’t recommended though, and although the riding isn’t particularly technical, it will definitely test you.

How much hike-a-bike is there?

This depends on your legs! There are a few sections where you will inevitably walk to save your legs, and a couple of sustained bits that are unrideable due to overgrown or lost paths. However, the hike-a-bike throughout the route is fairly safe, free of steep drops and loose surfaces.

How many entries are available?

We limit entries to 40 places. Entries close around six weeks before the start or when the event is full. We limit our entries to a lower level than many other events. The rule of thumb has always been that we need to be able to remember everyone’s name, and that dictates the maximum number of riders. Beyond this, we also consider logistical constraints and want to make sure we photograph every rider, ideally several times along the route.

Can I leave a bag at the start?

Yes. We’ll give you a label to put on your bag at registration.

Where is the nearest train station?

Abergavenny is the closest station, about 30 minutes away by bike.

Can I use my own tracker?

No. For simplicity’s sake (and to avoid using disposable batteries) we only use Follow My Challenge’s Queclink trackers.

Can pairs enter?

Yes, we have solo and pairs categories for all our events. When you enter, you can choose which you want to register for and will have the opportunity to say who your other half is if you’re entering as a pair.

Some other events have discounts for pairs, but please note that we don’t offer this. Our pricing is simply based on our costs and there are no cost savings for us if you enter as a pair.

What kind of bike can I use?

You will need a regular commercially available solo* upright bike. However, it’s important that it is suitable for the kind of riding that the event will entail, since our routes are designed to be challenging. The right equipment is required to ride them safely and to minimise risk. For example, that means your bike needs to have brakes capable of handling steep, sustained descents. If you have any concerns that your bike may not be suitable/appropriate, please get in touch and we will be happy to advise.

*Tandems are also permitted for TPA and WWC, but you will be placed in a separate category rather than the pairs one.

Can I book accommodation along the route in advance?

Yes, you can! We know that some events restrict this, but we don’t. There are several reasons for this, but it is partly to help reduce costs for riders and make things less daunting for those with less experience. For those looking to push themselves, pre-booking accommodation rarely works and often becomes a hindrance rather than a help. Therefore, we find it is normally only less experienced and less competitive riders who take advantage of this rule.

Can I use the photos taken during the event?

Yes! Everyone who takes part will be sent an album of all the photos taken during the event. This is typically several hundred and will include not just the best photos but a wide variety. We realise that a photo may have significance or importance to a rider beyond its pure aesthetics, so we try not to be too selective with our editing.

You are welcome to use these photos for personal use, which includes personal social media and personal blogs. Please credit The Perfidious Albion when you do this. You cannot use these photos for any kind of commercial use. However, we grant exceptions to this on a case-by-case basis for business blogs and social posts. Please ask for permission if you would like to do this.

Will friends and family be able to follow me during the event?

Yes! There are several ways that people can keep up with your progress during the event. You will have a GPS tracker provided by Follow My Challenge and this will be linked to a webpage, which we will share in the week before the start. Here, your dot will be visible and people will be able to follow your progress along the route.

As well as this, our team will be out on the route getting photos, videos and insight from all the riders. Our aim is to try and cover the whole field, meaning that everyone is intercepted at least once. A selection of photos and videos will be published as posts and stories on our Instagram account several times a day during the event, accompanied by brief updates on riders’ progress.

Finally, we have also teamed up with DotWatcher to provide in-event commentary on their site, accompanied by an embedded version of the event tracking map. Here, a commentator (either a volunteer or one of the team) will take you through each day’s events, giving an overview of riders’ progress as well as sharing any tales from the road.

Is this a race?

You may have noticed that we don’t describe any of our events as races. There are a few reasons for this, but the key thing is that we don’t want to define success or failure for you. For some people, just finishing is the main challenge. For others, they will have a set time goal in mind. Then some of you will think you aren’t competitive until you get sucked into an arduous day-long battle for mid-pack places. And, finally, there will be those that simply want to be first across the line.

Basically, whatever we call this event, you will probably ride it the way you perceive it anyway. The most important thing to remember is that it is just you against the route. Embrace this battle, see what the weather and mechanical gods throw at you along the way, and we’ll see you at the finish.

Because it’s not a race, what should I expect to be different?

As this isn’t a race, we really put the onus on riders to self-police when it comes to respecting the rules and being self-supported. We’re happy to advise and will definitely clarify any ambiguity for riders. But in the end, we’re all adults and there are no prizes, so there is a mutual understanding that the only person you’re cheating is yourself if you don’t respect the rules.

One of the areas that has come into focus in recent years is how strictly events define riding as self-supported. Because our events aren’t races, we intentionally take a slightly more relaxed view and stick to a definition that focuses on avoiding actions that gain a definite advantage, such as drafting, stashing kit etc. We are less worried about actions that could have a potential advantage, such as riding together for a couple of hours or pre-booking accommodation. Of course, we respect that races feel the obligation to prohibit these things and riders should be aware that different events have different rules.

Will you provide info on resupply along the route?

No! We will highlight where resupply options may be limited and will provide a general overview of the route in the rider guide that flags things like this, as well as other potential hazards. But we believe that thoroughly researching the route and doing your own preparations for the ride are an important part of the sport, as well as fitting within our definition of what self-supported means.

Plus, from a safety perspective, we think it’s important that riders familiarise themselves with the route and identify what kit they might need and how much food they should carry.

Where does my entry fee go?

There are some fixed costs associated with running events e.g insurance, web hosting etc., so a small part of the fee covers these. A larger part then covers things like trackers, caps and t-shirts. And then most of what is left (typically the majority with all our events) is used to pay for coverage and photography during the event. This includes logistical costs such as accommodation and transport, as well as staff costs. The final cost, which varies between events, is any start, finish and checkpoint fees that need covering.

It is worth noting that anyone paid during our events is only paid based on days worked, so there is no incentive to make our events more profitable. This means we usually invest in more photography (or a checkpoint during TPA23!) if we feel our budget can be increased. Any profit we do make is either reinvested into the events or given to charity. In 2023, we donated £300 to the bike project at Swindon Welcomes Ukraine.

Zolla WheelsThe Bike DropWindover BikesPetrichor ProjectsThe Long Table