The ride sponsor can create one or more rider classes that allow riders to be grouped. For instance, the MTF in the past has sponsored an IBA 50CC/100CCC long distance ride. Rider classes were used to group riders by the ride they intended to complete (e.g. 50CC JAX-SDO, 50CC SDO-JAX, 100CCC JAX-SDO-JAX...).
If rider classes exist, riders must choose one before continuing the registration process.