The GSD Double Century Challenge is a tough cycling challenge starting at Petersfield Market Square, and passing through Winchester, Chichester, Brighton and Eastbourne before returning to Petersfield along the northern edge of the South Downs National Park. The GSD 2CC is not itself a sportive, so navigation will be by GPS bike computers, participants will ride together in groups of similar ability and each group will be supported by a vehicle carrying hydration, nutrition, clothing, spare inner-tubes etc. This is a charity event but it combines our love of cycling with a need to raise awareness and funds for AGSD-UK. As such there is an entry fee which covers our costs of staging the event, and a small fundraising target to support the charity.