In 2017, pacers are allowed from Grouse on. Pacers can also start or stop at crew access aid stations (Ouray, Telluride, Chapman)
Runners over 60 years old may have pacers for the whole run.
Pacers must run at least the whole leg to the next crew access or specifically allowed aid station, as there is generally no access for them in between. Pacers may not continue unless accompanying their runner. There are no pacer check-ins, bibs, or recording of pacer names. The aid station check in/out volunteer simply needs to note that a runner arrived/left with a pacer on their clipboard.
Muling is not allowed.