Ultra Tour De Cymru (SW100) and Brecon 2 Cardiff Summer (SW50)- 11th-13th September 2020

logo en

The Ultra Tour De Cymru (SW100)- is a 100 mile ultra-trail footrace starting and finishing in Cardiff, crossing the South Wales Mountains and Valleys and the Brecon Beacons!  It is a demanding test of endurance over varied and challenging terrain, suitable for the committed and competent ultra-trail runner. The route has approximately 6000 meters of ascent and is over 90% on trails. It truly is a tour of some of the most amazing sites across South Wales and the Brecon Beacons including ancient castles, forests, mountain summits, breathtaking waterfalls and rolling green valleys,  hillsides and Mountain Summitts.  It is a UTMB qualifying race eligible for 6 UTMB points.

The The Brecon to Cardiff Summer Ultra (SW50) - is a MARKED 50 mile ultra following the second half of the SW100 route. Starting in Brecon, you will run, walk or crawl to the top of Pen y Fan, the highest peak in South Britain, where you will join the SW100 mile route to cross the Brecon Beacons and journey back to Cardiff via an amazing network of trails, mountain summitts, Green Valleys and Woodlands. It has has approximately 3000 meters of ascent and is a UTMB qualifying race eligible for 3 UTMB points. 

The Route

We've searched out the best landmarks in South Wales and the BRECON BEACONS and linked them all with an amazing network of rolling runnable trails. Starting in Cardiff, the capital city of Wales, the UTDC route heads out of the city crossing the river Taff then heading West along the fully waymarked 'Ridgeway route'.  On a clear day, from the top of the first climb, Mynydd Y Garth, you can see the highpoints stretched out of the entire circular route you are about to conquer - even Pen Y Fan looming in the distance!  After approximately 15 miles along the ridgeway route you turn North again heading through dramatic woodlands, then open fell to the top of the Bwlch.  From here the Maindy Trail brings you down and across the valleys of the old mining communities of Treorchy, over Maerdy Mountain, then the Rhigos Mountain. From here a fast downhill section on brings you out in 'Waterfall Country' and, into the Brecon Beacons National Park. The 'Four Waterfalls Walk' route is a highlight of the route as you pass under the breathtaking ' waterfall 'Sgwd yr Eira'.  By early morning you will be through Yestradfeltte Village - and you now have the day to cross the main Brecon Beacons Range. Following the Beacons Way and the more exposed summits of Fan Llia and Fan Frynych, you will drop down through the magical Graig Cerrig Gleisiad (Nature Reserve) to the Storey Arms at the half way point.

The route then climbs to the top of Pen Y Fan (via Corn Du) and it is here where the SW50 mile route joins the SW100.  You will cross the stunning Brecon Beacons mountain range of Pen y Fan, Cribyn and Fan y Big before the long descent to Talybont reservoir.  From here the steepest climb of the route is Tor Y Foel -  the crux of the route (named Mount Doom or 'The Devils Tit' by previous competitors) , after this it is (nearly) all downhill!  Heading South via the green and rolling hills through Tredegar, you'll reach the Rhymney Valle, the mountain peaks of Rhymney Hill, Mynydd Bedwellte, Cefn y Brithdir and then Caerphilly Castle - another highlight of the route. Skirting around Caerphilly Castle a final push over Caerphilly Mountain and Crag yr Alt brings you back Cardiff.

For a map of the 2020 UTDC (SW100) route and gps file click here

For a map of the 2020 B2C (SW50) route and gps file click here

You can download the route gps from the mapometer link above by clicking 'actions' then 'export'

Event Base / Race HQ

The event base , SW100 start and finish line for all races is at the following location:  
aspire fitness Nantgarw
Coleg y Cymoedd
Heol Cronchendy
Parc Nantgarw
CF15 7QX 


The Brecon 2 Cardiff Summer (SW50) start and race brief is at the following location (please note registration for all races is at the event HQ in Cardiff);

St Davids Church Hall,,

25 Church Street,




Course Following and Marking - 

The course will be marked at junctions with a combination of red/white marker tape, illuminous flags and yellow running arrows.  Markers will be located at any junction or turning where you change direction or leave the trail.  Please remember as with any marked ultra route that course markers may be removed or tampered with, and in that instance you will need to refer to your gps track, os map or guidebook to keep you on track.  There are no marshals between checkpoints, and so road crossings, mountain craft and the ability to follow the route signs (and gps/road book where required) are your responsibility.  Ultimately it is the runners responsibility to navigate the course successfully, with or without course markings. We highly recommend you recce the route before.


There are 11 manned checkpoints for the UTDC & 6 Checkpoints for the Brecon 2 Cardiff Summer (SW50).  The majority are indoors in community halls or similar. We provide a comprehensive variety of food and drinks.  Details of what was provided and locations in 2019 can be seen on the FAQ page on (Q17).  Checkpoints are spaced approximately every 6-10 miles.

There will be a number of compulsory clips located on the course (for example the top of Cribyn) to ensure competitors follow the course correctly, and these are not manned.

Time Limits & Start Times

The UTDC /SW100 course starts at 1900 on the Friday evening.

The B2CS /SW50 starts at 0900 on Saturday morning.

The SW100 Early (walkers) start, starts at 1300 on Friday with an overall cut off time of 44 hours.  

There is a 38 hour cut-off time for runners to complete the entire UTDC /SW100 course. There is a 24 hour cut off time for runners to complete the B2CS/SW50 course.  

The 'Early Start' allows for a 44 hour time limit for the SW100. For the Early start you will set off at 1pm on Friday giving you an extra 6 hours to complete the course.  Please note that if you decide to take the walkers start time and set off to quickly you will have to wait to go through the first few checkpoints as they will open based off a walkers speed.  If you take the walkers start this is non-competitive which means you will not be elegable for prizes in the race! 

Participant entry requirements & experience

Both routes require participants to be self-sufficient, which means you must be able to complete the route as if without any support, carrying the appropriate compulsory kit and food and water beween checkpoints.  To enter the UTDC you need to have experience in Ultra trail racing and as a minimum you should have completed at leat one 50 mile event of similar nature, examples will be asked for on the entry form.  You should be able to run comfortably and navigate at night.  You will need to be totally self-sufficient throughout the event and able to make sound mountain judgment. 

For the B2CS (SW50) entrants will need to be able to navigate the route using map, road book, gps and additional signage.  It is likely you will be finishing in the dark so you will need to be able to navigate and run in the dark.  You will need the physical fitness to complete the event carrying the compulsory kit including food and water between checkpoints. There is no qualifying necessary for the SW50, but you must have gained the required skills and fitness levels to complete the course safely.  


Compulsory Kit

As is custom in these types of events there is a compulsory kit list that must be carried for your safety.  Exact details can be found here .

Registration & Briefing

All entrants will be required to attend registration and briefing at the event HQ in Cardiff at the times outlined below.

Event Provisional Timings


1200-1230 Early Start registration & briefing
1300 Early start race start
1600-1730 SW100 Registration & briefing at 1730

1900 SW100 Start

1915-2100 Registration re-opens for SW50 competitors
2100 Registration closes


0700 Coach departs Cardiff from Race HQ 
0730-0830- Registration in Brecon
0830 SW50 Brief in Brecon
0900 SW50 start from Brecon
1700 First 100 finishers expected 
1800 First 50 competitors expected 


0900 Last finishers for all races
0930 Presentation
1000 Race HQ closes

What your entry fee includes

  • A marked route
  • Waterproof route description and map booklet 
  • Well stocked checkpoints
  • GPS tracking for both races
  • Event t-shirt
  • Event medal
  • Resting facilities at race HQ for Saturday night
  • Toilets, showers and changing facilities
  • Post event meal
  • GPS file
  • Two drop bags on the UTDC and 1 on the B2CS (SW50)
  • Bus transport from Cardiff to Brecon for B2CS (SW50) competitors
  • Physiotherapy, CAVRA First Aid and Safety Team cover
  • Experenced Race Directors, Race Team and amazing marshals
  • 6 UTMB Points for the UTDC (SW100) & 4 UTMB Points for the B2CS (SW50) 


Ultra Tour De Cymru (SW100) £120
Brecon 2 Cardiff Summer (SW50) £75

You can select the appropriate options when you sign up to the event online.


A list of Frequenctly Asked Questions can be found here


Race terms and conditions can be viewed here

Enter the UTDC (SW100) Online by clicking here


Enter the B2C Summer (SW50) Online by clicking here.   



Supported by...



Our Partners


CEP Black