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Gwydir Mawr & Bach

Llanrwst ,
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Gwydir Mawr-Creigiau PandoraGwydir Mawr-Paradwys PicsiGwydir Mawr-Cynffon y DdraigGwydir MawrGwydir Mawr


The 25km Gwydir Mawr Trail is a proper mountain bike trail in every sense of the term. Big climbs, big descents, brilliant singletrack and truly awesome scenery make this a trail to remember. Most, but not all, of the climbs are on forest roads and tracks giving you time to take in the views of the mountains of Snowdonia, and all of the descents are on the sweetest singletrack. The singletack varies from very tight, technical and rocky to wonderfully open and flowing, from dark forest to exposed ridgelines.

It incorporates the shorter Gwydir Bach trail, which is a 8.7km version taking between 45 to 90 minutes to complete.

The Gwydir mountain bike trails are managed and maintained by Natural Resources Wales. Follow MTB Ranger on Facebook, Twitter or Instagram for trail updates and drop our rangers a message if you come across any issues on the trail.


Address: Llanrwst
Ride Time (hours): 2
Distance: 20-30km
Grade: Red
Height Climbed (metres): 800
Trail Facilities: Local
Area: North Wales
Visit Wales Grading: N/A

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11 thoughts on “Gwydir Mawr & Bach

  • Tat sleeves
    on 6th August 2016

    Great trail before Awsome trail now the new section has been built and in the right section (near to the middle of the ride) great views quiet and free, what’s not to like?

  • Richard Burton
    on 15th May 2018

    Is this the Marin trail?

    • hannaha
      on 10th August 2018

      Hi Richard, yes it is!

  • Jamie
    on 18th September 2018

    Hello. will there ever be a section for Big rig Downhill riders on the Marin ?

    • Andy Braund
      on 19th October 2018

      Sorry Jamie. No plans for it. Gwydir Mawr & Bach trails will most likely always be xc trails. Unless a local group of riders were prepared to form a constituted group and come up with an acceptable proposal for building and managing their own trail.

      You can always message me if you want to chat about it.


  • Mitko
    on 5th November 2018

    Awesome Trail. Visited Recently and left amazed of the speed you can get on some sections. I know that words just cant explain how good it is that’s why I have made this video. Everyone should check this trail it is unbelievable good.
    Here is the link for the video :

  • Christopher Billington
    on 1st April 2019

    I’ve been dying to do this for years, is it sign posted or is it pure mapping to get around??

    Cheers Billy

    on 2nd April 2019

    Very well sign posted but a map is always advisable if you don’t know the area

  • David
    on 7th July 2020

    Hi is the marin mtb trails now open?

    • Andy Braund
      on 8th July 2020

      Yep, they are all open now. Just remember to maintain social distancing especially at the trailhead car park.

  • Jo Yates
    on 29th July 2020

    Hi, is Gwydir Bach suitable for beginners? Considering taking my son tomorrow, we’ve never done a trail before but he’s keen to try. If this isn’t suitable is there another you would recommend. Thanks Jo

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Snowdonia North

North Wales