I have been accused in some circles of exaggerating the "birth of the sport" issue. After all, I am asked, didn't people race similar bikes on dirt roads before you guys did?
Human nature being what it is, I would say yes they did, but there is no record of their activities or of any race results. No one who took part in any such activities affected the bicycle industry.
OTOH, from that day in 1976 forward, there are race results on record, and every race that took place from that day on included riders who had been in the previous race, linking all these events together in an unbroken chain until the "official" organisation (NORBA) was formed some seven years later. The bikes in use became the template for every major manufacturer over the next half-decade.
While there may have been downhill races before ours, once again there is no record of the results or the participants. By creating the downhill time trial on a steep hill and a bad road, I believe we came up with a definitive new use for a bicycle that had not been seen before, and that use drove our passion for the mechanical end of the sport.