Under bridges, through gaps in billboards and air planes, it seems the tightest fit is enough space to skydive in Grand Theft Auto Online.
A new stunt montage from RedKeyMon, which you can see above, shows him navigate the skies of San Andreas. Some of the routes he takes are very narrow indeed, passing through an oil well for example, and he also avoid a rocket launcher in one landing.
There are plenty of things in Los Santos which could be described as "extreme" but this really is an extreme sport and those jumps need very tight control to pull off.
Today Rockstar has announced that the PC version of Grand Theft Auto 5 has been delayed until March and has also revealed the specs needed to run their open world behemoth.