Wheels Manufacturing Loose Ball Bearing

These are 5/32-inch loose ball bearings, which is a common size, but compatibility depends entirely on your specific component. You must verify the required size for your hub, headset, or bottom bracket by checking the manufacturer's technical manual or measuring your existing bearings with calipers before purchasing.

Grade 25 refers to the sphericity and diameter tolerance of the ball bearings. A lower grade number indicates a tighter tolerance, meaning these bearings are highly uniform in size and shape, which reduces friction and wear within your bearing races for a smoother, more responsive ride.

No, these are loose ball bearings designed for cup-and-cone style systems. They cannot be used as a direct replacement for sealed cartridge bearings, which are self-contained units.

Yes, you should use a high-quality bicycle-specific waterproof grease when installing these. Proper lubrication is essential to prevent corrosion and ensure the bearings seat correctly and rotate smoothly within the race.

Loose ball bearings are easily lost during maintenance, and it is common to find pitted or worn balls that need replacing during a standard overhaul. Having a bulk supply ensures you have enough to complete the job without interruption and provides spares for future maintenance.