What Are the Dimensions of a Skateboard Bearing?

When you’re diving into the world of skateboarding, understanding the dimensions of skateboard bearings can make a significant difference in your ride. Skateboard bearings are small but mighty components that influence speed, smoothness, and overall performance. The most common bearing size in the skateboard industry is the 608 bearing, which measures 8x22x7mm. This size fits perfectly with most skateboard wheels, inline skate wheels, and even scooter wheels.

Another popular size is the 627 bearing, which has slightly different dimensions but still plays a crucial role in specific types of skate setups. With an inside diameter of 7 millimeters and an outside diameter of 22 millimeters, these bearings are often found in artistic and recreational quad roller skate wheels. Knowing the right dimensions can help you choose the best bearings for your needs, ensuring a smoother and more enjoyable skateboarding experience.

Understanding Skateboard Bearings

Significance of Bearing Dimensions

Finding the right skateboard bearing dimensions is critical for a seamless skateboarding experience. The most common bearing size, the 608, measures 8x22x7mm. These dimensions mean the bearing has an 8mm inner diameter, a 22mm outer diameter, and a 7mm width. Most skateboard, inline skate, and scooter wheels accommodate this standard size.

Another size often used is the 627 bearing, which has a slightly different set of dimensions. These are more fitting for artistic and recreational quad roller skate wheels. Choosing bearings with the right dimensions can significantly impact speed, smoothness, and performance.

Components of a Skateboard Bearing

Skateboard bearings consist of multiple essential components, each playing a vital role in functionality.

  1. Inner Ring: The inner ring, measuring 8mm in diameter for the 608 bearings, fits around the axle.
  2. Outer Ring: This 22mm diameter ring encases the bearing structure, providing stability.
  3. Balls: Typically six or seven balls are positioned between the inner and outer rings, reducing friction and enabling smooth rotation.
  4. Cage: This component keeps the balls evenly spaced, ensuring uniform movement.
  5. Shield: Often made of metal or rubber, the shield protects the bearing’s interior from dust and debris.
  6. Lubricant: Lubricants, such as Bones Speed Cream, fill natural imperfections in the bearing, reduce friction, and minimize heat generation.

Understanding these components and their interactions highlights the importance of choosing quality bearings suited to specific skating needs. Proper maintenance and the appropriate dimensions ensure long-lasting, efficient performance.

Standard Skateboard Bearing Dimensions

Inner Diameter

The inner diameter of skateboard bearings typically measures 8 millimeters. This measurement fits snugly onto the axle of most skateboards, inline skates, and scooters. Bearings with an inner diameter of 8mm are known as 608 bearings and are the most popular choice in the skateboarding community. There’s also the 627 bearing with a slightly smaller inner diameter of 7mm, often used for artistic and recreational quad roller skate wheels.

Outer Diameter

Standard skateboard bearings have an outer diameter of 22 millimeters. This dimension ensures they fit securely within the wheel hub, providing stability and smooth movement. Both 608 and 627 bearings share this 22mm outer diameter, making them versatile for various skate applications such as skateboards and inline skates.


The width of skateboard bearings is consistently 7 millimeters. This dimension, whether unsealed or with two shields, maintains a consistent profile across different types of bearings. The 608 and 627 bearings both uphold this width standard, facilitating better interchangeability and compatibility with different wheel types.

Types of Skateboard Bearings

Steel Bearings

Steel bearings are the most common type used in skateboards. They contain steel balls, which can vary in quality based on the steel used. Most steel bearings fall within the standard dimensions of 8x22x7mm for 608 bearings and 7x22x7mm for 627 bearings. Their affordability makes them a popular choice among beginners and casual skaters. Prices for steel bearings can range from $10 to $80. The durability and performance depend on the quality of the steel and the construction of the bearing. Although they are prone to rust, regular maintenance can extend their longevity and keep them performing well. Notable examples include ABEC 9 bearings which provide a good balance between cost and performance.

Ceramic Bearings

Ceramic bearings use ceramic balls encased in high-quality steel. They are known for their smoothness and speed due to the lower friction of ceramic balls. Ceramic bearings have better heat resistance and do not rust, making them low maintenance. The dimensions usually match those of steel bearings, with 608 and 627 types being common. While they tend to be more expensive, typically costing more than $100, the higher cost is offset by the improved performance and durability. Ceramic bearings often contain more balls than steel bearings, enhancing their load-bearing capacity and overall performance. These bearings are ideal for high-performance and everyday use scenarios where long-lasting performance is crucial.

Maintenance and Installation Tips

Cleaning and Lubrication

Skateboard bearings perform best when they’re clean and properly lubricated. Dirt and grime build-up can negatively impact performance, sometimes stopping the bearing completely. Skaters who hit the streets often should clean their bearings more frequently.

To start, you need a small bowl or a special cleaning container, as well as a cleaning fluid like brake cleaner or acetone. These fluids effectively remove debris and old lubricant. A drop cloth and gloves can protect surfaces and your hands from harmful chemicals.

Here’s a step-by-step process:

  1. Remove Bearings: Disassemble the wheels to access the bearings.
  2. Initial Cleaning: Soak the bearings in the cleaning fluid for about 15 minutes.
  3. Scrub and Rinse: Use a small brush to scrub the bearings, then rinse them with fresh fluid.
  4. Drying: Allow the bearings to air dry completely.
  5. Lubrication: Apply a few drops of high-quality bearing oil to each bearing. Ensure the lubricant spreads evenly by spinning the bearing.

Regular cleaning and lubrication can prolong your bearing lifespan and enhances your skateboard’s performance.

Installation Process

Correct installation ensures that bearings work efficiently and extend their service life. Follow these guidelines to properly install skateboard bearings.

  1. Insertion: Place the bearing on the axle. Gently press it until it fits snugly into the wheel hub.
  2. Alignment: Ensure the bearing aligns correctly with the wheel to avoid any misalignment that could affect performance.
  3. Securing the Bearings: Use the bearing spacers if available. Spacers maintain the correct distance between bearings and prevent over-tightening.
  4. Wheel Attachment: Attach the wheel to the axle and tighten the nuts. Ensure they’re secure but not overly tight, which could compress the bearings and hinder performance.

Using the right tools and techniques, you can install and maintain your bearings, ensuring a smooth and enjoyable ride.


Understanding skateboard bearing dimensions is crucial for optimal performance and longevity. By choosing the right size and type of bearings and maintaining them properly, you can ensure a smoother ride. Regular cleaning and lubrication are key to extending the life of your bearings. Proper installation techniques, including alignment and securing with spacers, play a significant role in bearing efficiency. Follow these guidelines to keep your skateboard performing at its best and enjoy a more enjoyable skating experience.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top