70s are a smaller radial/conical shape with dimensions 7.0mm x 5.1mm also feature a slight rounding to the wheels edges. Have a slight over hang past the lock nut of about 0.1mm.
79s are a standard street shape wheel that is 7.9mm x 5mm. These also sit flush with the locknut of your trucks.
80s are a different take on a bowl wheel, these are 8.0mm x 5.7mm wheel, smaller diameter than most bowl wheels. still featuring a more square shape and larger offset. These have about 0.5mm over hang past your locknuts.
84s are a scaled up version of 80s. They are 8.4mm x 6mm with a conical style shape.
89s are a large squared off wheel sitting at 8.9mm x 5.5mm in a shape id call a big bowl wheel design. Sits flush with lock nut.
