[nhramnl]

Class isn't usually contested at Divisional races. Regardless, who runs who is usually decided in a gentlemanly way by the contestants. If two guys (out of say 5 contestants) want to race each other, they "pair-off" and the remaining 3 guys work out who races who. If there is an uneven number of contestants (like 5, instead of four, six or eight), the fastest guy is often given the bye for the first round.