Correction for the length of The Indianapolis Motor Speedway
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How long is 81.770 shackles?
It's about three-fifths as long as The Indianapolis Motor Speedway
The length of The Indianapolis Motor Speedway is about 146.6670 shackles.
(Speedway, Indiana) (rectangular oval course)
The rectangular oval course of the Indianapolis Motor Speedway is 146.6670 shackles. While famous for its automotive racing, the first motorsport held at the track was a series of motorcycle races in August, 1909 — a little less than two years before the inaugural Indianapolis 500 race was run.