The following riders successfully completed the Castleton 50 Challenge Ride held on Sunday, 19 September 2021.
- Aleks Ageikinas
- Jim Benbow
- John Carr
- Eoin Carroll
- Paul Coxon
- Marty Curren
- Andy Curson
- Neil Donaghy
- Rob Donaghy
- Ian Fryett
- Peter Gunn
- Craig Hardaker
- Adam Hardy
- Eric Harkins
- Chris Harrison
- Phil Harvey
- David Hick
- Mike Jefferies
- Kev Johnson
- Dave Kirton
- David Lawson
- Holly Lincoln
- Carl Maynard
- Lewis Maynard
- Anth Moy
- Ryan Murray
- Sonny Playforth
- Bernie Powell
- Simon Robinson
- Mark Smith
- Nick Smith
- Robin Stocks
- Andy Stott
- Ian Summersgill
- Dan Waring
- Bruce Whiteside