Yes, there are small wheels that do not have ball bearings. These wheels typically have a simpler design and are often used in applications where precision and smooth rotation are not critical. While ball bearings are commonly used in wheels to reduce friction and improve efficiency, some small wheels may opt for a simpler bushing or sleeve bearing design instead. **

The wheels of a mousetrap car can vary in size, but they are typically small. Small wheels allow for greater acceleration and speed, as they require less force to turn. Additionally, smaller wheels reduce friction and allow the car to travel farther with the same amount of energy from the mousetrap. Therefore, small wheels are often preferred for mousetrap cars to maximize their performance. **

A bicycle with smaller wheels may have a slightly slower top speed compared to the same bicycle with larger wheels due to the smaller wheels requiring more rotations to cover the same distance. However, the difference in speed may not be significant for casual riders. Additionally, smaller wheels can offer advantages in terms of maneuverability and acceleration, which may be more important factors to consider depending on the intended use of the bicycle. **

The choice between large and small wheels for an electric wheelchair depends on the user's specific needs and preferences. Large wheels are better for outdoor use and rough terrain, providing better stability and maneuverability. They can handle bumps and uneven surfaces more effectively. On the other hand, small wheels are more suitable for indoor use and tight spaces, offering better maneuverability in confined areas. Ultimately, the best option will depend on the user's lifestyle and the environments in which they will be using the wheelchair most frequently. **

A model car with larger wheels will generally drive faster than one with smaller wheels. This is because larger wheels cover more ground with each rotation, allowing the car to travel a greater distance in the same amount of time. Additionally, larger wheels can provide better traction and stability, which can contribute to faster speeds. However, other factors such as the weight of the car and the power of the motor can also impact its speed. **

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. **

The main difference between the KTM 85SX with small and big wheels lies in the wheel size. The small wheel version comes with 17-inch front and 14-inch rear wheels, while the big wheel version features 19-inch front and 16-inch rear wheels. The big wheel version offers better stability and handling over rough terrain due to the larger wheel size, making it suitable for taller or more experienced riders. On the other hand, the small wheel version is lighter and more agile, making it a good choice for younger or smaller riders looking for easier maneuverability. **

The main difference between the KTM 85SX with small and large wheels is the wheel size. The small wheel version comes with 17-inch front and 14-inch rear wheels, while the large wheel version has 19-inch front and 16-inch rear wheels. The small wheel version is typically preferred by younger or smaller riders due to its lower seat height and lighter weight, while the large wheel version offers better stability and handling for taller or more experienced riders. Ultimately, the choice between the two comes down to rider preference and riding style. **