"Riders must arrive at each checkpoint between the start and the finish while the checkpoint is open. If a rider arrives at a checkpoint after it has closed and the ride organizer is satisfied that the rider’s lateness is due to the occurrence of something unforeseen and beyond the control of the rider (such as stopping to help at a traffic accident or a road closure), then the ride organizer may waive the fact that the rider arrived at the control late and allow the rider to continue. Poor bicycle or equipment maintenance, fatigue, lack of fitness, hunger, etc. are not unforeseen and beyond the control of the rider and therefore will not serve as a valid reason for being late. Subject to the foregoing, failure to make all checkpoints, even if the brevet is done within the overall time limit, will result in disqualification."
Edit: Som jag läser det skulle det vara en förmildrande omständighet om bakdäcket var i gott skick och explosionen berodde på något oväntat på vägbanan men inte om det var ett slitet däck.