The Trans Cambrian Way was devised by IMBA in 2005. The route starts in Knighton on the English - Welsh border and finishes at Dovey Junction ... the point where the Dovey estuary becomes tidal, meaning you've reached the Irish sea. Although the majority of riders ride the route in the intended east - west direction, there's no reason why it can't be completed the opposite way.
70% of the route is off road, often traversing some pretty remote Welsh countryside ... if you enjoy solitude in the great outdoors then the TCW should be a very enjoyable experience!
The official line is that the TCW is a 3 or possibly 4 day ride. IMBA broke the days into legs between possible accommodation options ... the 3 separate days are,
Day 1/ Knighton - Rhayader 50km
Day 2/ Rhayader - Llangurig 70km
Day 3/ Llangurig - Dovey Jun' 55km
Much more fun to do it in one go though!
You can download the entire route in various formats at the IMBA website
One of the attractions of the TCW is the remoteness of much of the route. However, the same remoteness can make riding it far more challenging. Re-supply can cause quite a few headaches, especially when trying to complete it as an ITT. Options for re-supply are pretty limited but having an idea what's out there should make your life a little easier.
Don't gamble on the smaller shops and post offices been open. If they're not, then you'll have to ride from Knighton to Rhayader or Dovey Junction to Rhayader before you'll be able to re-supply ... TAKE PLENTY OF FOOD!
Knighton ... Plenty of options so stock up.
Knucklas ... General store and post office.
Llanbadarn Fyndd ... Petrol station/shop.
Rhayader ... All hail the mighty Spar.
Elan Valley ... Vistitor centre cafe.
Pont-Rhyd-y-groes ... General store.
Llangurig ... General store.
Staylittle ... General store.
There's plenty of options in Machynlleth but you don't actually go through it on route. If you're attempting a double then stock up at every opportunity.
Wales is blessed with ample rain, so finding water shouldn't really be an issue. As long as you're sensible and apply some common sense, there's no reason why you won't be able to pick up safe drinking water from natural sources along the route. If you're unsure what constitutes common sense in this situation, pack some water purification tablets!
Both Knighton and Dovey Junction are served by rail links that run via Shrewsbury.