What does 78a mean on longboard wheels?
The "78a" on longboard wheels refers to the durometer rating of the wheels. Durometer is a measurement of the hardness of a wheel's urethane material. It is typically indicated by a number followed by the letter "A." The higher the number, the harder the wheel, and the lower the number, the softer the wheel.

In the case of "78a," the "78" represents the numerical value of the durometer rating, and the "a" indicates that the rating is on the A scale. The A scale is commonly used for measuring the hardness of softer materials like skateboard and longboard wheels.
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Wheels with a durometer rating of 78a are considered very soft. They offer excellent grip and are often used for cruising, carving, and riding on rough surfaces. These soft wheels provide a smooth and comfortable ride by absorbing bumps and cracks in the pavement. They are well-suited for riders who prioritize a smooth and forgiving ride rather than sliding or high-speed performance.

However, it's important to note that wheel durometer is just one factor to consider when selecting longboard wheels. Other factors such as wheel size, shape, and contact patch also play a role in determining the performance and characteristics of the wheels. Consider your riding style, terrain, and personal preferences to choose the most suitable longboard wheels for your needs.