The time it takes to change a wheel bearing can vary depending on the make and model of the vehicle, as well as the experience level of the person performing the task. Generally, it can take anywhere from 1-3 hours to change a wheel bearing. This includes the time it takes to lift the vehicle, remove the wheel, brake caliper, and rotor, and then press out the old bearing and press in the new one. It's important to follow the manufacturer's recommended procedures and use the proper tools to ensure the job is done correctly. **

It is difficult to determine whether the wheel bearing is broken without further inspection. However, some common signs of a broken wheel bearing include a loud grinding or growling noise coming from the wheel area, excessive play or looseness in the wheel, and uneven tire wear. It is important to have a professional mechanic inspect the vehicle to accurately diagnose the issue and determine if it is indeed the wheel bearing or another component causing the problem. **

Driving with a broken wheel bearing is extremely dangerous and should be avoided at all costs. A broken wheel bearing can cause the wheel to seize up or come off while driving, leading to a loss of control of the vehicle. It is recommended to stop driving immediately and have the wheel bearing replaced as soon as possible to prevent any accidents or further damage to the vehicle. **

The TÜV (Technical Inspection Association) in Germany allows for a maximum wheel bearing play of 0.5mm for passenger cars. This means that when the wheel is jacked up and the mechanic tries to move it from side to side, there should be no more than 0.5mm of play in the wheel bearing. This specification is important for ensuring the safety and stability of the vehicle while driving. **

No, it is not true that wheel bearing damage is only audible at high speeds. While wheel bearing noise can become more pronounced at higher speeds, it can also be heard at lower speeds. The noise is often described as a growling or rumbling sound that increases with vehicle speed. It is important to address any unusual noise coming from the wheels as soon as possible, regardless of the speed at which it is heard, to prevent further damage and ensure safe driving conditions. **

No, a wheel bearing damage can be audible at both high and low speeds. At high speeds, the noise may be more pronounced due to the increased rotation of the wheel. However, at lower speeds, the noise may still be present but quieter and may sound like a humming or grinding noise. It is important to address any unusual noises coming from the wheels regardless of the speed to prevent further damage to the vehicle. **

The size of the wheel bearing on a mountain bike is typically found on the bearing itself or on the packaging if you have a replacement bearing. You can also refer to the bike's manual or contact the manufacturer for specific information about the wheel bearing size. If you are unable to find the size, a bike shop or mechanic can help you identify the correct wheel bearing for your mountain bike. **

The answer to whether retail trade or wholesale and foreign trade is better depends on various factors such as the specific business goals, target market, and resources available. Retail trade involves selling products directly to consumers, allowing for higher profit margins but also requiring more marketing and customer service efforts. On the other hand, wholesale and foreign trade involve selling products in bulk to other businesses or overseas markets, offering the potential for larger sales volumes but with lower profit margins. Ultimately, the best choice would depend on the individual business's strengths, market opportunities, and long-term objectives. **