Trans Cambrian Way – 3-Day Guided Mountain Bike Adventure through the green heart of Wales Join us for a fully-guided, 3-day mountain biking experience along the Trans Cambrian Way – a 106-mile (approx. 175km) epic that traverses the remote Cambrian Mountains, the oldest mountain range in Europe. Starting in Knighton on the English border and finishing at Machynlleth in the Dyfi Valley, this route offers big climbs (around 13,000ft in total), wild landscapes, and the kind of unforgettable riding