The best tire for the BMW X1 is the Michelin Pilot Sport 4S. This tire is highly regarded for its performance, comfort, and safety features, making it an excellent choice for drivers who want to enhance their BMW X1's driving experience.

The Michelin Pilot Sport 4S is designed to provide exceptional handling and grip, which is crucial for a vehicle like the BMW X1 that is known for its dynamic driving characteristics. According to Consumer Reports, the Michelin Pilot Sport 4S offers "excellent grip in both dry and wet conditions," which is essential for maintaining control and safety on various road surfaces. The tire's advanced tread design and rubber compound contribute to its superior performance, ensuring that the BMW X1 can handle corners with precision and stability.

Additionally, the Michelin Pilot Sport 4S is known for its comfortable ride quality. This is particularly important for the BMW X1, which is designed to offer a luxurious driving experience. According to Tire Rack, the Michelin Pilot Sport 4S provides "a smooth and quiet ride," which helps to reduce driver fatigue on long journeys. The tire's ability to absorb road imperfections and minimize noise makes it an ideal choice for drivers who prioritize comfort.

In terms of safety, the Michelin Pilot Sport 4S excels. The tire's robust construction and advanced tread pattern help to prevent hydroplaning, which is a significant concern for drivers in wet conditions. According to the National Highway Traffic Safety Administration (NHTSA), tires with good wet traction are less likely to cause accidents due to loss of control. The Michelin Pilot Sport 4S meets or exceeds the NHTSA's safety standards, providing peace of mind for drivers.

Furthermore, the Michelin Pilot Sport 4S is known for its longevity. The tire's durable construction and high-quality materials help to extend the life of the tire, reducing the need for frequent replacements. This not only saves money in the long run but also contributes to environmental sustainability by reducing the number of tires that end up in landfills.

In conclusion, the Michelin Pilot Sport 4S is the best tire for the BMW X1 due to its exceptional handling, comfort, safety, and longevity. Its combination of performance and practicality makes it an ideal choice for drivers who want to get the most out of their vehicle.