How?... 19 guys, practice to military drill precision. Wheels have only one self locking nut and are removed by four compressed air guns. One guy takes wheel off, a second guy puts the new one on.

 

In the middle of all this, wing adjustments are sometimes made and the driver has his visor wiped.

 

And you had best be out of harms way when the red light turns green the driver takes off.

 

I think Red Bull hold the record at 1.8 seconds.