This series of events can be done on a 29er (probably the best option) or cyclocross/Gravel bike. I did one of the rounds this year in the Lake District on my Cube Reaction 29er and really enjoyed it. Mixture of single track/fire roads/rough farm tracks and country lanes. I'm planning on the full series next year,starting in Dalby Forest with the Moors and Shores already enterd, before doing the Peak Pioneer out of Bakewell. The Galloway Gallop is out of the Kirroughtree MTB centre and the Lakeland Monster Miles more or less finishes off the series.