The following is an industry press release...
The top 15 overall riders from the previous year must ride the pro class the following year, plus any riders that choose to advance themselves to the pro class.
At the first event the winner of the previous year’s series will start on row 21, the second place finisher on row 22 and continue in order one per row through row 35. Any rider that chooses to advance to the pro class will start on row 36 and continue one per minute in order based on the earliest registration.
Beginning with the 2nd event and continuing through the rest of the series, the top 10 riders overall, including Pro and A classes, from the previous round will be placed on rows based on their overall results from that round. The winner of the previous event will start on row 21 and the second place finisher on row 22 and continue in order one per row through row 30.
The riders that were not in the top 10 overall in the previous round but are in the top 15 overall in the current year series point standings will be lined up one per row starting on row 31 in order of their place in the series points. In the event a top 10 rider does not show up for the next round, that number would not be used.
Any riders that register in the pro class but were not in the top 10 overall in the previous round and are not in the top 15 in the current series point standings will be lined up one per row beginning with the first available row past those riders that are in the top 15 overall in series points.