The last descent on the ClimachX is frankly, epic! My favourite man-made descent by a mile. It is pretty rough in places but there is nothing huge or scary on it, no massive jumps or gaps, it’s just proper! If you can handle red’s at places like CyB or similar welsh centres you’ll be fine. Technically the last descent is graded Red, or at least it was the last time I rode some 4 years ago. Never rode Mach 1, 2 or 3, but I hear they’re more natural feeling and not as fun, more old school XC in feel. ClimachX is a must-do if you’re in the area, the first climb is massive, no two ways about it, but it’s worth it for the last descent.
Climachx and the Dyfi Forest in general has a wide range of singletrack, from fun and flowy to full-on hardcore. If you’ve come from trail centres, expect to find it rocky and slippery in the wet, as this is slate country! Each climb is 250-300m. Phone signal in the forest is poor, so don’t expect all mobile apps to work.
The Mach Trails are old-skool XC trails (now known as Epic, Backcountry, Adventure…) taking in vast views and landscapes. They are not technical in the modern sense, but If you know how, they can be linked all the way to Nant Y Arian making a great day out.