‘Top fuel motorcycle dirt drag racing’ certainly is a mouthful but what, exactly, is it? As it transpires this sport has been in existence for more than two decades! It involves the motorbike’s rear being adapted to accommodate a much larger wheel with rather prominent threads. The wheels are so large that they almost appear as if they’ve been lifted from a small tractor! Top fuel racing is the fastest sanctioned form of drag racing. Credit: YouTube/Dixie Dirt draggers