Wheels Manufacturing Loose Ball Bearing

You must check your specific hub, headset, or bottom bracket manufacturer's technical manual. Bearing sizes are not universal, and using the wrong size can cause significant damage to your components or lead to a dangerous mechanical failure.

Grade 25 refers to the precision of the bearing's sphericity and diameter tolerance. A lower grade number indicates a tighter tolerance, meaning these bearings are highly uniform and round, which reduces friction and wear compared to lower-grade alternatives.

Yes, provided your specific components require 3/16-inch bearings. These are versatile enough for use in hubs, headsets, and bottom brackets, as long as the size matches your original equipment specifications.

Yes, you should always use a high-quality bicycle-specific waterproof grease when installing loose ball bearings. This prevents corrosion, keeps the bearings in place during assembly, and ensures smooth operation over time.

No, you should never mix old and new bearings. Bearings wear together as a set, and introducing new, perfectly round balls into a worn race with old, pitted balls will accelerate wear on all components.