the first 2 years 81-82 ,I ran all different #'s ... the race promoters issued #'s at the track. and when we raced desert SCORE they also issued #s... So if u are looking through old magazines its kinda random... but when the race promoters let us run what we wanted, the top 20 pro's had there favorite numbers and no body ever stepped on toes... everyone new coming into the sport knew 1,21,22,31,33,34,41 etc... they were taken... Also when doing photo shoots, we all ran our numbers unless we were doing a test on a new 3wler... and the magazine wanted to keep it stock.... I ran 333 more in the later days of my career..I just liked the way it looked and something different.... Brett