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The difference between wheel bolts with R12, R13, R14, and R15 ball heads

When it comes to wheel bolts, it is important to understand that not all bolts are the same. One of the most important differences between different types of wheel bolts is the ball head radius, which can be R12, R13, R14, or R15.

What is the ball head radius?

The ball head radius refers to the rounded part of the bolt that sits in the wheel's bolt hole. This radius can vary, and this is where we see the differences between R12, R13, R14, and R15. The number after "R" indicates the radius of the ball head in millimeters. Whether a bolt is R12, R13, R14, or R15 can only be measured with special tools. 

hjulbolt radius

Why is it important?

Choosing the correct ball head radius is crucial to ensure a safe and proper mounting of the wheel. If you use a bolt with the wrong ball head radius, it can cause the wheel to not sit properly, which can result in vibrations while driving and, in the worst case, the wheel can fall off.

The difference between R12, R13, R14, and R15

  • R12: This is a smaller ball head radius, often used in some older or specific car models.
  • R13: This is a slightly larger radius and is commonly used in many car models.
  • R14: Even larger than R13, R14 is often used in larger cars or cars with larger wheels.
  • R15: This is the largest ball head radius and is typically used in very large cars or trucks.

It is important to note that you should always check the manufacturer's specifications for your car to ensure you are using the correct ball head radius.

Conclusion

Understanding the difference between R12, R13, R14, and R15 ball heads can help you ensure that your wheels are properly mounted and safe to drive on. Always remember to check your car's specifications.