Wheels Manufacturing Loose Ball Bearing

These are standard 1/4-inch loose ball bearings, which are commonly used in many bicycle hubs, bottom brackets, and headsets. However, you must verify the specific size required by your component's manufacturer, as using the wrong diameter will cause damage or poor performance.

The grade refers to the ball's sphericity and surface finish tolerance. A Grade 300 rating indicates a high level of precision suitable for standard bicycle applications, ensuring the bearings are round enough to spin smoothly and reduce friction without the extreme cost of aerospace-grade components.

Yes, you should always use a high-quality bicycle-specific grease when installing loose ball bearings. This helps hold the bearings in place during assembly and provides essential lubrication to prevent corrosion and premature wear.

It is strongly recommended to replace the entire set of bearings at once. Mixing new, perfectly round bearings with worn, pitted ones will cause uneven wear and damage the bearing races, leading to a rough feel and potential mechanical failure.

The number of bearings varies significantly depending on the hub design and axle size. You should count the bearings you remove from your specific hub or consult your hub's technical manual to ensure you have the correct quantity before starting the service.