Enduro Radial Bearing Abec3 Mr 21531 Llb 21.5 X 31 X 7 Mm

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Product Name: MR 21531 LLB - ABEC-3 Radial Bearing
Dimensions:
- Inner Diameter (ID): 21.5mm
- Outer Diameter (OD): 31mm
- Thickness: 7mm
Bearing Type: Radial Bearing (designed to handle radial loads)
Precision Rating: ABEC-3 (Annular Bearing Engineers Committee standard, offering high precision and smooth operation)
Material:
- Races: 52100 High-Carbon Chromium Alloy Steel (vacuum-degassed for purity, hardened to Rockwell HRC 64)
- Balls: Grade 10 Chromium Steel (extremely round, within 10/1,000,000ths of an inch)
Seals:
- Type: LLB (Light-contact, dual-lip labyrinth seals)
- Design: Rides in a micro-groove to form a full labyrinth, providing superior protection against water, dust, and debris
Grease: 90% fill with Mobilux NGLI 2 high-pressure waterproof synthetic grease (ensures durability under daily use and harsh conditions)
Clearance: C3 (slightly increased internal clearance for smoother operation under load)
Weight: Approximately 15-20g (exact weight not always specified, but typical for this size and type)
Purpose:
- Commonly used as a front hub bearing (e.g., older WTB 20mm hubs)
- Also found in some ISIS bottom brackets
Features:
- Deep-groove raceways to accommodate larger balls, enhancing load capacity and durability
- Engineered for maximum ball complement within the races
Item Code: BB MR 21531 LLB (Enduro’s internal reference)

Additional Notes:

This bearing is an "oddball" size, not as common as standard metric bearings (e.g., 6000 or 6800 series), making it a specialty item for specific applications like hubs or bottom brackets.
The ABEC-3 rating ensures a balance of precision and cost-effectiveness, suitable for most cycling needs without the higher cost of ABEC-5 or ceramic options.
Available material variants include high-carbon chromium steel (standard), 440C stainless steel, ceramic-hybrid, or XD-15 with ceramic/stainless balls, though the MR 21531 LLB is typically the steel version unless specified otherwise.

ENDURO

Discover Enduro Bearings, the perfect choice for enhancing your bike’s performance with smooth, reliable, and long-lasting bearings. Ideal for mountain bikes and road bikes, Enduro Bearings ensure a smoother ride and improved durability. Upgrade your bike with components designed for excellence. Shop now for fast and reliable delivery from Hyper Ride.

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