Brook is known for his flat pedal assault and he's used Burgtecs for a while now. They're burly and dependable and that counts more than anything else during a World Cup race run. He runs Shimano Saint Cranks that are 165mm length and the chain stays on thanks to the MRP G3 chainguide.
Credit: Matt Delorme
Pro Bike Check: Brook MacDonald's Trek World Racing Session 9.9 0 of 13