Durometer A scale is used to measure the hardness
Durometer A scale is used to measure the hardness of skateboard wheel. From 75a to 99a this scale represents increasing hardness. You may also see skateboards marked 100a or higher, but don’t be fooled ” the A scale just goes up to 99. Street skateboard wheels are generally extremely hard, which allows them to slow down fast and accumulate power as you go along. This makes it appropriate for tricks and jumps. Hardware the similar is true with vert wheels, which are typically used on ramps, uphill, and upward curves. Softer wheels offer superior maneuvering and speed control, making them perfect for slalom racing and long boards.
