I'd been keeping an eye on the Deeside Trail website and group since it's inception over a year ago. Since then there have been 2 group rides and various people doing it as an individual time trial (ITT) using GPS data to prove times and routes.
I wanted to join them. Looking at the route on the website I could see it stretched westwards from it's start point in Banchory, into the Cairngorm National Park past the market town of Ballater and then into the mountains around Braemar. It then looped back around northwards taking in more remote mountain passes before some of the steepest and longest climbs in the last third as it headed back to Banchory again. It looked a challenging route. Others who'd done it already didn't disagree.