Thames Ring Series | TR100

up the Grand Union Canal and back to the Thames via the Oxford canal before returning to the start in Streatley. The route almost entirely on canal and riverside paths and relatively flat, though not as easy as you may think. Runners in the full distance have 100 hours (4 days 4 hours) to complete the run, navigating using maps, gpx files and being supported by checkpoints every 25 miles or so. It's an extremely tough run, testing runners endurance to the limit with many long hours with little sleep and dark nights. The first race of this distance in the UK and for many years the longest non-stop race in Europe. It may be flat but it's not easy... New for 2026 we have made the event into a series with the addition of 2 shorter distances. The Original TR250, the TR150 from the start to the 158 nile CP at Nether Heyford and the TR100 from Nether Heyford to the Finish. Both the 150 and 100 versions have very generous cutoff times. Full info and details will be added to the Race Packs (soon). We are looking at transport options for the 100 to get you to the start but for the 150 you will be responsible for getting picked up from the finish.