Brecon to Cardiff Xtreme

4 February 2024
Cardiff, uk
mountains race
73 KM
1 day
500 Runners
Difficulty:    Expert
ENTRY FEE:    75.00 gbp

The Brecon to Cardiff Xtreme, is the mountain running version of our classic Brecon to Cardiff ultramarathon which is now in its 10th year. The B2C Xtreme is a 73kilometer, linear race over 11 major peaks between Brecon and Cardiff. This is a tough winter ultra marathon with 2650 meters of ascent and is only suitable for those with excellent winter mountain running skills, experience and fitness. 

The Route
Starting at the canal basin in Brecon the Xtreme heads through the old town then straight to the top of Pen Y Fan – the highest peak in South Britain.  This is followed by steep climbs up Crybin and Fan Y Big, before a fast descent down the Roman road takes you to lower Neuadd reservoir and CP1.  Another short but steep climb reaches the Twyn Mwyalchod trig point, and is followed by a long descent towards Pontsticilli Reservoir and CP2. From here the Xtreme and classic B2C routes briefly converge with some faster forestry running over more rolling hills, before gaining the half way checkpoint in Merthyr. 

Now clear of the national park, the classic B2C course rolls gently downhill to the finish, but the Xtreme still has approximately half the elevation to conquer! Initially it is an ascent of Twyn y Werfa into the Gethin woodlands, followed by a rolling high level traverse south over Twyn Ddisgwylfa and Mynedd Gethin (Mynedd Merthyr).  Following the climb up Pen y Foel, the route converges again with the Brecon to Cardiff classic runners and a short section along the banks of the river Taff takes you to the checkpoint in the world famous Honky Tronk café in Pontypridd!  Here you can stock up on food, Welsh hospitality and Tom Jones songs before heading out into the last section of the course.  With the end nearly in sight, the Xtreme runners head up and over Cefn Eglwysilan and Mynedd Meio before the fast drop down into the finish and the wonderful welcome at the Coleg Y Cymoedd.

As the route is linear competitors park at the finish and are transported by coach, to the start in Brecon.  

Event Base, Finish and Registration Location
The event base, registration and race finish is at Coleg Y Cymoedd at the following location: 
Coleg y Cymoedd
Heol Cronchendy
Parc Nantgarw
CF15 7QX 

The event base provides event parking, café, large indoor area for registration, the finish line, toilets, changing rooms and showers.  It is easily accessible off the A470 and one junction off the M4. There are many hotels, guest houses, cafes and restaurants in the local area.  In addition there are excellent bus and rail links to and from Cardiff.

This is an extreme mountain challenge, and the route is unmarked.  There will be some additional markings provided where the route converges with the classic B2C route, and some additional signs in the dense forest sections, but you must expect to be self-sufficient in terms of navigation throughout.

There are 5 manned checkpoints which provide water, energy drinks, squash, sweets, biscuits, oranges, crisps.  The halfway checkpoint is indoors at Merthyr College in the town centre and is a great location to meet friends and family and you will have access to your drop bag and some time to get sorted, changed and ready to take on the final half!  Details of where the checkpoints are can be seen on the FAQ page. The link is at the bottom of this page. 

As the route is linear you will park your car at Cardiff (Nantgarw) race HQ/registration and catch one of the busses (included in your entry fee) to the start of the event in Brecon.  The B2C Xtreme busses leave Nantgarw Race HQ at 0530 on Sunday morning.

Time Limit
The time limit for the event is 14 hours (9pm cut off).  Only runners finishing WITHIN the time limit will be eligible for a finishers medal.

Compulsory Kit
There is a compulsory kit list that must be carried. This may vary depending on the conditions and can be viewed here. 

Timetable -including Start, Coach Pick up and Registration Times
1700-2000 Registration in Nantgarw

0530 Bus pick up from Nantgarw and travel to Brecon
0615-0630 Registration in Brecon (only available if pre-booked*)
0620 Bus arrives Brecon
0630 Race brief at Theatre
0700 Race start from Brecon
2100 Cut off time Nantgarw

*If you would like to register in Brecon you can book this by e-mail after you receive the event notes two weeks before the event date. Please don’t e-mail requesting to register in Brecon before this date as they will need to be re-sent.


Race entry, parking, coach transport and GPS tracking £75.

Optional extras:
Cotton race t-shirt £10
Technical race t-shirt £15
Race Hoodie £35

What your entry fee includes
Participation in a classic event
Electronic timing
Live GPS Tracking and map for friends and family to follow from Open Tracking
Open Tracking live mapping at race finish and halfway point
Race buff
Checkpoints well stocked with refreshments

Half way drop bag transport (at the Merthyr CP)
Finishers medal (strictly for finishers only)
Emergency First Aid cover from CAVRA
Event photos
Car parking at the finish in Cardiff
Bus transport from Cardiff to Brecon on Sunday morning
Welsh weather (hopefully)


Are you the race organiser?

Event Organiser

Sian Parry

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Date Range

Global - Virtual


A virtual race which can be run at any time shown on the dates shown, on any type of terrain in any country.

Suitable for

For runners from beginners to experienced as you choose your own course and challenge based on the guidelines and options set by the virtual race organiser.

Endurance - Multi-activity


An ultra distance race including at least two of the following activities such as running, swimming, cycling, kayaking, skiing and climbing. It may also include different climatic conditions (eg ice, snow, humidity, cold water, mud or heat).

Suitable for

Experienced multi-skilled athletes who have trained for the different activities included in this event. Admission to these races may be subject to receipt of a recent medical examination certificate. Check with the race organiser regarding entry requirements and any specialist equipment required such as a wetsuit, skis or a mountain bike.



Increase of up to 2000 metres with very challenging climatic conditions (e.g. ice, snow, humidity, heat or at high altitude)

Suitable for

Very experienced long distance ultra runners (min 3 years’ experience) or are doing regular long distance running (>50 miles) with elevation and conditions shown (where possible). Admission to these races is often subject to receipt of a recent medical examination certificate. Purchase of specialist kit is often recommended for these races.



Increase of up to 2000 metres with some challenging climatic conditions (e.g. ice, snow, humidity or heat)

Suitable for

Experienced runners who have completed at least 4 ultras in last 12 months, or are doing regular long distance running (>50 miles) with elevation and conditions shown (where possible). Admission to these races may be subject to receipt of a recent medical examination certificate. Check with the race organiser regarding entry requirements.



Increase of up to 1500 metres

Suitable for

Runners who have completed several ultra distances or similar events, or are doing long distance running regularly, with elevation shown.



Increase of up to 1000 metres

Suitable for

Runners who have completed at least one ultra in last 6 months or are doing long distance running (>26 miles) regularly, with elevation shown.



Very little change < 500 metres

Suitable for

First ultra event. Runners completing a marathon or doing regular long distance running (>26 miles) in the last 6 months.