All-City 2 For 1 Non-Drive Side Dropout KitAll City 2 For 1 Non Drive Side Dropout Kit. The All City 2 For 1 Dropout is a sliding dropout system consisting of replaceable dropout plates and fixing hardware. Designed for use with 12mm thru axles and flat mount brakes it is compatible only with select All City models. Allows riders to convert from a geared to single speed setup or vice versa Compatible only with select All City models