The RIDUM

About the Event

Discover the spectacular, lesser-known ridges encircling Cardiff at The RIDUM, a 30-mile ultra marathon set for Saturday, 5th September 2026. This challenging loop follows the Rhymney Valley Ridgeway Walk, delivering 4,402 feet of ascent and breathtaking panoramic views across South East Wales from its high points like Mynydd Machen. Starting and finishing at Parc Penalta, the route is a perfect blend of 90% runnable trails and quiet country lanes, offering a true taste of Welsh uplands just a stone's throw from the capital. Renowned for its incredible community spirit and fully-stocked checkpoints, the event focuses on personal adventure over strict cut-offs, inviting you to soak in the scenery and camaraderie. As the final race in the prestigious Pegasus Slam series, it's the ultimate way to cap your ultra season or a fantastic standalone challenge. Lace up for a professionally organised, friendly, and authentically Welsh trail experience that proves the best views often lie just beyond the city's edge.

Races Offered

30 Mile

Sep 06, 2025

straighten

Distance — 48.3K

terrain

Type — —

timer

07:00

Weather History

These values represent the 3-year monthly averages for September in Llanbradach.

thermostat Temperature

10.9° / 16.8°

wb_sunny Feels like

8.2° / 14.5°

light_mode Avg sunshine hours

7h 30m

water_drop Avg rainfall

5.2 mm

ac_unit Avg snowfall

—

air Avg wind speed

14.7 km/h (Gentle breeze)

opacity Sweat loss rate

Low

terrain Course conditions

Firm and slightly soft

sunny Max UV Index

Moderate (3.5)

humidity_mid Humidity

84.9%

wb_twilight Sunrise

06:48

nightlight Sunset

19:26

About Llanbradach

Learn more about the host city, Llanbradach.

Llanbradach is a village in the county borough of Caerphilly, South Wales. It lies within the historic boundaries of Glamorgan, less than three miles north of the town of Caerphilly. It is part of the community of Llanbradach and Pwll-y-Pant.