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Half Marathon PR Times inaccurately measured

AmazinglyAwesomeAdam
5 months ago

Can anybody explain why my Half Marathon time is recorded as the time I posted for 13.25 miles even though a half marathon is 13.11 miles???

Oddly enough, when I look at my PR pace, Garmin is dividing this time for 13.25 miles by 13.11 miles. Garmin - I've seen posts as old as 4 yrs on this issue - why is this so hard to get right?

Example - my run was 13.26 miles in 1:43:20, or 7:48 / mile pace, however, my Half Marathon PR is 1:43:20 with a pace of 7:53 / mi. Garmin should have recorded my PR as 1:42:18 w/ 7:48 / mi pace.

  • 0 5 months ago

    If you run a distance close to the distance for the personal record you will get the full activity as the record. That will handle inaccuracies in the race course and in the logging. Most users will during a race stop the watch at the course end no matter the distance which usually is a little longer than the personal record distance and that will be the official time for that distance. You will not change that official time just because the watch measured a little longer distance, right?

    You can manually change the time to something else: How Do I Manage My Personal Records in Garmin Connect?

  • 0 5 months ago in reply to e7andy

    Yeah, and also, real world distance is always a little bit bigger than the official 13.1094 mi or 21.0975 km.

    Marathon official measuring rules say:

    "An official IAAF marathon course is 42.195 km. Course officials add a short course prevention factor of up to one meter per kilometer to their measurements to reduce the risk of a measuring error producing a length below the minimum distance."

  • 0 5 months ago in reply to e7andy

    Yeah, unfortunately in this case, Garmin is actually doing the right thing (imo), but bc it's so unintuitive, everyone thinks it's wrong. You (OP) are def not the first person to notice or mention this.

    Like e7andy said, if your activity distance is slightly longer than a PR distance, the whole activity will be used for the PR, to account for the common case of a race where the recorded distance is a bit longer than the race distance. If you run significantly farther, then it works as you would expect (the PR time/pace is based on the exact PR distance).

    Otoh, Strava always uses the exact PR distance for PRs. This is more intuitive for most ppl, but it also means that your PR distances based on races will always be a little fast (since nobody ever records the exact race distance on their watch.)