So there are some great lists of who, what bike, home town, points, age, etc of past entrants of the IBR.
These lists also give rank or DNF but is there any data about DNF specifics? I can guess that many of the BMW DNFs where final drive explosions but even if it was bike or mind failure would be interesting?
Also pretty shocking as to the number of rookies who win and also to the percentage of DNFs overall.
Such specific detail would indeed be interesting, as well as instructive for future IBR riders, vets & rookies alike. Another DNF "reason" in the more recent IBRs was not meeting a minimum requirement for finishing (points, states, parks, as examples) even though arriving before closing at all checkpoints & the finish. I may gather the DNF details as a future project.
As noted by others, good source material for individuals' DNF reasons is the daily reports, available on the
IBA website for 2013 & later (dailies from earlier IBRs are not currently available there, but some fans have preserved copies, independently). Bob Higdon's historical series in the IBA magazine is another valuable source for IBRs from 1984 onward.
The figures related to DNFs are scattered throughout the
IBR Facts page. You'll notice that
in total for all years, the DNF percentage is essentially identical for vets & rookies, at about 23%. The breakdown of
DNFs by IBR year varies considerably, likely due to the differing characteristics of the rallies
(IBR summary here).
Other direct links to DNF figures within the
IBR Facts page are ...
By motorcycle manufacturer
By rider age grouping
By gender (solo male, solo female, 2-up, 3-up)
Regards ... Dave