This Sunday riders will take on the RTTC National 25 mile TT championships on the N1/25C course in Cambridgeshire. The National 25 Mile Time Trial Championship is part of a long-standing tradition in British cycling that dates back to the early 20th century. In 1922, a group of cycling clubs formed the Road Racing Council (RRC) to bring uniformity to road time trials, which were growing in popularity. Initially limited to founder clubs and those hosting open events, the RRC set out basic rules and recommendations to ensure consistent race conduct across the country. As the sport expanded and modern traffic conditions posed new challenges, the RRC evolved into the Road Time Trials Council (RTTC) in 1937, opening its membership to all cycling clubs and introducing a national framework for managing the sport.

Since then, the RTTC—now operating under the name Cycling Time Trials (CTT)—has continued to oversee and support the sport at all levels, from grassroots club events to national championships. The aim has remained unchanged: to ensure fair, safe, and standardised time trials across the UK, preserving a discipline that has thrived for over a century. The great history of this event amplifies the prestige.

Course Profile

Weather Forecast

The wind direction should play a role in rider’s pacing though, with Sunday forecast to be a cross tailwind on the way out and a cross headwind on the return. The course is an out-back-out-back with a roundabout on the return and the finish line sits at the bottom of the starting hill. 

If you want to play about with the forecast and see how you’d stack up at the National 25 mile championships the forecast is here.