In the tone of now referring to half ironman's as "Ironman 70.3" we should continue the trend. Sprints should be called "Ironman 16.0", Olympics are now "Ironman 32.0"

For running the 10K is now a "Marathon 6.2", a 5K is now a "Marathon 3.1" and the 50 metre dash is now a "Marathon 0.003"

In cycling a 40K time trial is now a "Century 24.9"