MANY YEARS AGO USA CYCLING, OUR SPORT'S OVERLORDS, CREATED CATEGORIES FOR RACERS. We start as Category 5 on the road, 4 off-road and work up to Category 1, then on to Pro. I have immensely enjoyed the competition and "catting up" over the years.
You probably have a few of your own. I'd love to know what they are... it's always good to try and cat up some more.