ENDURO BEARINGS 3903 llu - abec 3 - double row (radial) - 17x30x10

3903 LLU - Double-Row ABEC-3 Radial Bearing (17mm x 30mm x 10mm) Designed primarily for older square-taper bottom brackets, the 3903 LLU double-row bearing significantly reduces flex in bottom bracket spindles and doubles the contact area for enhanced durability. Its compact design requires approximately 25% less width than two single-row bearings. Featuring deep-groove race design, Grade 10 balls, LLU seals, and 90% fill with high-pressure waterproof grease, this bearing withstands daily wear and harsh elements. Part of the Enduro line, it is available in high-carbon chromium steel, 440C stainless steel, ceramic-hybrid, and XD-15 with ceramic or stainless steel balls. Engineered with deep groove races to accommodate larger balls, it also includes dual-lip labyrinth seals for superior environmental protection.