I managed to find a good detailed summary of course length data for the WGI track. Anyone doing calculations for ideal lap times at any given speed, needs this information.
Here:
https://www.racingcircuits.info/nort...kins-glen.html
What's in the review:
The Inner Loop is on the back stretch, just prior to the big downhill horseshoe bend. It's a chicane, a narrowed portion of the track that requires a quick swerve to the right and then back left again, rejoining the straightaway.
Up till this year, the GGP used the "Short Circuit", without inner loop: 2.428 miles. This year the GGP used the "Grand Prix Circuit", without the Inner Loop (so far as I know), 3.377 miles.
Grand Prix Circuit with Inner Loop - 1992 to date
3.450 miles / 5.552 km
Grand Prix Circuit - 1992 to date
(without the inner loop)
3.377 miles / 5.435 km
Short Circuit with Inner Loop - 1992 to date
2.450 miles / 3.943 km
Short Circuit 1992 to date
(without inner loop)
2.428 miles / 3.907 km