What is it? The SDD is a 202 mile ride that starts in Winchester and follows the South Downs Way trail to its end in Eastbourne, turns around and finishes back at Winchester.
Who has ridden it? Several riders so far. Ian Butler kicked it all off in 2005 as the first recorded rider to complete the epic ride under 24 hours.
His time doesn't last long though, as Mike Cotty wades in and sets an impressive time of 22h 25m 22s in 2006.
Ian Butler has another attempt in 2007, but a succession of punctures and an errant badger put paid to his efforts.
In the same year Neil Newell completes the ride in 22h 20m 25s, and was the first to carry a live GPS tracker.
Then, in May 2008, Rob Lee not only smashed the previous fastest time with 20h 55m 51s, but pioneered the 'Alpine style', riding completely unsupported.