I hate to break it to David, but Burry climbs like a scared monkey..., so I am not quite sure where exactly David wants to gain time. Have a look at the results of the Sea Otter Classic, Burry hurt some BIG names there. And, please, marathons are not road races. Not even on the climbs. From what I heard, David is still coming to terms with turning on regular gravel. I have great respect for David as a cyclist, but I think he is setting himself up for huge humiliation. IF he pulls this off, I am getting in the ring with Mike Tyson, and will call him a sissy. Simoni? He is not the only Euro-pro to use MTBing as cross-training. MTB is not Mickey Mouse. If you disagree, try it first.