Thanks for all the replies guys.
The reason I wanted to know what the acceptable standard of measuring a jump on a tack is, is that I don't want to say I'm jumping a 90 foot tabletop if it's only 65 feet.
There is a new table top on the track and people have been saying it's about a 100 foot long, but peek to peek it seems about 65 to 70 foot to me. (It also looked like a 100 foot until I cleared it for the firs time, then it suddenly shrunk.) I'll pace it off next time I'm at the track.
Before I open my mouth I like to be sure I know what I'm talking about.
I irritate me when people talk about their near stock 250's doing 100 miles an hour while behind a buddy’s car, and jumping a 100 foot when the jump is only 65 foot long.
Regarding the Johnny Airtime site, it's also good to know the official way to measure jumps.