Enduro bearings loose ball bearings - grade 5 chrome steel - 3/16'' (4.760 mm) (50 pcs)

BK-5059 - 3/16 (0.1875) Grade 5 Steel Balls - 50 pcs Enduro offers high-quality loose balls that are essential for bike repairs and maintenance. These Grade 5 steel balls meet or exceed a sphericity tolerance of 5/1,000,000, making them extremely round—so precise that even race-worthy bearings cannot be ground to match that level of accuracy. Perfect for high-performance bicycle hubs and bottom brackets, these balls are the same grade as those used in Enduro ABEC-5 bearings. Where Grade 25 was once considered very high quality, entry-level ABEC-3 bearings now use Grade 10 balls, while higher grades such as Grade 5 offer better performance and durability for demanding cyclists.