Motorcycle racing in the USA used to be a huge spectator sport. Big enough that they held an ST and a TT race in one weekend at the Houston Astrodome. According to memory, the engine limit for AMA Short Track (ST) races was 250cc for 2-strokes.
The fastest film I could find in those days was ASA 400 (ISO 400). The color shots here were exposed at 400. The B&W images were exposed for ISO 1600 and pushed in processing. Click Here to See More Photos and Read the Whole Article