For street skating, it is generally recommended to use hard wheels. Hard wheels provide better speed and durability on rough surfaces like concrete and asphalt. They also offer more control and stability for tricks and maneuvers. Soft wheels, on the other hand, are better suited for cruising and smooth surfaces, as they provide a smoother ride and better shock absorption. Therefore, for street skating, hard wheels are the preferred choice for most skaters. **

Hard wheels are better than soft wheels for tricks that require a lot of speed and precision, such as technical flip tricks and grinds. The hardness of the wheels allows for faster acceleration and more control, making it easier to execute these types of tricks. Additionally, hard wheels provide a more stable and consistent surface for landing and sliding, which is essential for performing advanced tricks. **

Yes, soft wheels with a hardness of 78a are generally better for beginners to learn skateboarding. The softer wheels provide more grip and stability, making it easier for beginners to maintain balance and control while learning basic skateboarding skills. Additionally, the softer wheels absorb more shock and vibrations, which can help beginners feel more comfortable and confident as they practice. Overall, softer wheels with a hardness of 78a are a good choice for beginners to learn skateboarding. **

The rear wheels of motorcycles are typically smaller than the front wheels for several reasons. Firstly, having a smaller rear wheel helps to reduce the overall weight of the motorcycle, which can improve handling and maneuverability. Additionally, a smaller rear wheel can also contribute to better acceleration and performance, as it reduces rotational inertia. Lastly, the smaller rear wheel allows for a larger tire contact patch, which can improve traction and stability, especially during cornering. **

Yes, it is possible to use 15-inch wheels instead of 16-inch wheels as long as the 15-inch wheels are compatible with the vehicle's specifications. However, it is important to consider the impact on the vehicle's performance, handling, and overall safety when making this change. It is recommended to consult with a professional mechanic or refer to the vehicle's manual to ensure that the 15-inch wheels are suitable for use. **

No, you cannot replace longboard wheels with skateboard wheels. Longboard wheels are typically larger and softer than skateboard wheels, allowing for a smoother ride and better stability at higher speeds. Skateboard wheels are smaller and harder, designed for tricks and maneuvers that require more precision and control. Using skateboard wheels on a longboard could result in a less comfortable and less stable ride. **

Aluminum wheels are generally more expensive than steel wheels. This is because aluminum is a lighter and more durable material, which makes it more desirable for high-performance and luxury vehicles. Steel wheels, on the other hand, are more affordable and commonly used in economy cars and trucks. The cost difference between the two types of wheels can vary depending on the specific design, size, and brand. **

The choice between 80mm and 100mm wheels depends on the specific use and preference of the skater. 80mm wheels are generally better for maneuverability and agility, making them suitable for tricks and urban skating. On the other hand, 100mm wheels are better for speed and stability, making them ideal for long-distance skating and cruising. Ultimately, the better option will depend on the skater's skating style and the type of terrain they will be skating on. **