Widely-believed athletic feats that are either flatly untrue or based on idle speculation.

I’ll start:

[Wilt being an “Olympic-level” track star](https://www.reddit.com/r/nba/comments/9akkos/debunking_most_every_wilt_chamberlain_track_field/). Russell had a much better claim to that. Wilt was a good track athlete…that’s as far as anyone can go.

[Jordan having a 48-inch vertical](https://sports.yahoo.com/article/jordan-had-48-inch-vert-185900863.html#:~:text=MJ%20admitted%20he%20was%20never,Rick%20Telander%20seven%20years%20earlier.). If he jumped that high it was never measured, by his own admission.