Comes with three sets of spacers_
1) For wheels 30 mm wide / 8 mm axles (Radix wheels)
2) For wheels 24 mm wide (standard wheels)
3) For wheels 30 mm wide / 12 mm axles = 12 STD wheels (Ethic Calypso)
Width referres to the hub width (not PU width).
Put simply, this deck is compatible with all the wheels outhere and thats the only thing you need to know.