Not sure of routes but it's easy enough to build your own if you know your way around. Try including Nant Gwynant pass from Beddgelert to Capel Curig, Llanberis and Ogwen Passes to the North. All suffer with bad traffic congestion during the summer, though 🙁
A good loop would be to go up Gwynant, across to Capel Curig, left up the A5 and through Ogwen, then left in Bethesda, Tregarth and and Pentir (or the u/c road over Mynydd Llandegai if you want it even harder), up Llanberis pass and back down Gwynant.
Or go south from Betws Y Coed along the A470 to Llan Ffestiniog, then left over the moors to Ysbyty Ifan. In Pentrefoelas take the B-road through Nebo and either drop down to Llanrwst or carry on North towards Colwyn Bay direction, drop down to Conwy and go back up the valley to Betws on the much quieter B-road on the western side.
There are plenty of little known, tough rides around Hiraethog and the Denbighshire moors. Look for the routes of the Dave Lloyd Megachallenge and Gran Fondo Cymru on bikely.com – both are tough, long sportive rides known for their hard climbs.
Some of the longest climbs are around the Beacons and Black Mountains. Look for the roads used by the Dragon Ride or the Tour of the Black Mountains. None of the climbs we have will be Alpine in scale but there are plenty of hard ones around if you care to look for them.
