National Cycle Route 81 in Wales runs for 137 km over two stages, beginning at Welshpool and finishing at Aberystwyth. The route reaches a maximum height of 402 m and features a total ascent of 1218 m.
The first stage from Welshpool to Rhayader covers 71.7 km with 743 m of climbing. This section includes several climbs, notably one starting at 25.5 km that rises 196 m over 4.3 km at an average gradient of 4.6%, peaking at 314 m. Other climbs range between 1.4 km and 4.9 km with average gradients from 3.2% to 4.6% and maximum gradients up to 8.8%. The highest point reached on this stage is 338 m. There are 35 possible water or food stops along this leg.
The second stage runs 65.4 km from Llansantffraed-Cwmdeuddwr to Aberystwyth, ascending 475 m. It has several smaller climbs; the longest is 2.3 km averaging 2.2% gradient, and the steepest section reaches 10.3% over 1.2 km. The highest elevation on this stage is 402 m. Seventeen water or food stops are noted on this leg.
The route passes through numerous settlements including Welshpool, Newtown, Rhayader, and Aberystwyth. The total climb is moderate, with gradients generally under 10%, suitable in varying weather as no specific temperature or month data is available. Water and food stops are reasonably frequent, with more in the first stage.
No border crossings or specific seasonal information is provided. The path includes a sequence of short to medium climbs with the main elevation gained early in the first stage. The second stage is shorter with gentler ascents finishing at the coast town of Aberystwyth.
