Antifreeze Coed y Brenin

The Antifreeze is a multi lap, chip timed, staggered start mountain bike endurance challenge staged at Coed y Brenin Forest Park.  


Antifreeze 2021 – EVENT CANCELLED

Sadly, we have taken the decision to cancel the 2021 Coed y Brenin Antifreeze event. Of all our events, this one with its staggered start seemed most fit to comply with Coronavirus safety measures. However, all our events take considerable forward planning and it is necessary for us to commit to their delivery a long time in advance of the event date with so much that takes place well in advance including access permissions, equipment and infrastructure to be booked, staff secured and entries and administration work to complete. Unfortunately with so much uncertainty around what restrictions will be in place at the time of the event it is impossible for us to move forward with any degree of certainty that we would be able to deliver on a pledge to provide the event we would plan and promote. For this reason, rather than move ahead and risk cancellation we have chosen to put the event on hold in the hope of a glorious return in 2022.

We know that many of you will be disappointed, we see many familiar faces at the Antifreeze, and know that some of you have ridden the event every year since it began.  So to everyone who has ridden the event in the past we would like to say a huge thank you for your support and we really hope we’ll be seeing you again before too long.

Antifreeze Coed y Brenin

Melt the trails!

The Antifreeze is a non-competitive, staggered start, chip timed, multi lap, mountain bike endurance challenge on the all weather trails of Coed y Brenin Forest Park.

Event images..


Coed y Brenin

The Uk’s original trail centre provides the perfect base for the event. It’s all weather trails and great tree cover provide protection from the elements while still affording spectacular views of the southern Snowdonian mountains, weather permitting. From rocky track to swooping singletrack, Coed y Brenin offers a fine mix of riding that will challenge and delight. The event is based around the Coed y Brenin Visitor Centre offering all the facilities you might want including a cafe that serves everything from hot drinks and snacks to full meals. There are showers and changing, toilets, bike wash and a well stocked bike shop to cater for all your mountain biking needs.

The route is a hand picked selection of the finest trails that the forest park has on offer. 

The Format

The event is a staggered start format, allowing riders to begin at any time the event start is open. This offers a very relaxed atmosphere, eases the pressure and helps reduce congestion at bottle necks on the course, which of course allows us to include more of that lovely singletrack that Coed y Brenin is famous for.

Riders assemble in the start corral while the event start is open and a start marshal feeds them onto the course. Timing starts the moment you cross the timing point so each riders time is individualised to their ride, accurately recorded by RFID data chip. Once you cross the start mat the clock is ticking until you finish. You have the option to ride 1, 2 or 3 laps of the (aprox.) 11.5km course but you don’t need to decide beforehand, just ride the number of laps you want (to a max of 3) and our timing system will allocate your time to the appropriate distance event. 

The course

Each lap of the course is around 12km and riders can elect to ride 1, 2 or 3 laps. You don’t even need to decide beforehand the distance you want to ride, you simply ride the number of laps you wish and our timing system will allocate the time to the correct event distance category.


With riders starting, lapping and finishing right in front of the visitor centre, directly below the cafe balcony. There’s music pumping and a real buzz of activity at the event hub with a great atmosphere as riders pass the timing point receiving encouragement from spectators and finishers as they choose whether or not to ride “Another lap?”.  

Wave goodbye to the Winter chills!

The event has seen all weather from glorious sunshine to snow and at this time of year in Wales, anything is certainly possible but what better way to prove your mettle than to take on the challenge of a fine winter’s end trail ride of the highest calibre at the UK’s original trail centre.

There will be a warm welcome, good company, great atmosphere and fine trails to ride. The event has sold out each year since it’s creation and with only 400 places available we expect this year will be no different.

We hope you’ll join us for another fun blast around Coed y Brenin to chase away the chills of winter.  

2020 Event Times


Jr Antifreeze: Sign-on: 9.30am to 11.30am. Course start open : 10.00am – 12 noon.


Fox Antifreeze: Sign on: 8am to 9.30am. Event start open : 10am to 11.15am.

Times are provisional until confirmed in final event joining information which will be sent to event participants by email around 1 week prior to the event. When published, event joining information will also be available from this page.


E-Bikes are permitted to ride the Antifreeze (ebike = motor assisted pedal bike, pedelec) under the following conditions:  (1) The bike must be a UK road legal pedelec (must not be chipped, de-redistricted, re-mapped or modified in any way) and (2) The rider must declare at sign-on that they will be riding an eBike in the event. PLEASE NOTE THAT NO BIKE CHARGING FACILITIES ARE AVAILABLE AT THE EVENT. WE RESTRICT RIDERS TO A SINGLE BATTERY ONLY. 



Event images

  "A great day's riding on great trails" - Richard Jones  

Antifreeze 20120 Print (back)

Fox Performance T – £20

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