ABEC 11 Flywheel, Refly, Superfly Longboard Wheel for Electric Skateboard, Downhill and Cruising Durometers THE ORIGINAL OVERSIZED WHEEL - The ABEC 11 Flywheel is the original massive wheel. These wheels are time tested and are without a doubt some of the fastest wheels ever made. ELECTRIC SKATEBOARD COMPATIBLE - These wheels are compatible with most electric skateboards, although they will need an adapter made specifically for them. A quick search should find you the part. TWO DIFFERENT FORMULAS - CLASSIC: The classic grip & slip mix. Easy to ride and absorbs a good amount of road imperfections. | REFLEX: Grippy and fast. Absorbs most of the road imperfections. Slightly harder to slide, but slides smooth when broken in. DUROMETERS - Classic: 75a | Reflex: 74a SPECIFICATIONS - 83mm x 52mm | 90mm x 52mm | 97mm x 52mm | 107mm x 64mm