Enduro MR 15307 LLU/LLB Radial Cartridge Bearing - ABEC-5
Bearings
Enduro MR 15307 LLU/LLB Radial Cartridge Bearing - ABEC-5
Enduro MR 15307 LLU/LLB Radial Cartridge Bearing - ABEC-5
The Enduro MR 15307 is a high-precision radial cartridge bearing built to ABEC-5 tolerance standards, delivering tighter dimensional accuracy and smoother rotation than ABEC-3 bearings of the same size. Read the overview
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Overview
What Makes the Enduro MR 15307 ABEC-5 Bearing So Precise?
The Enduro MR 15307 is a high-precision radial cartridge bearing built to ABEC-5 tolerance standards, delivering tighter dimensional accuracy and smoother rotation than ABEC-3 bearings of the same size. High-precision chromium steel balls provide smooth, durable rolling performance in demanding cycling applications. The dual-seal design pairs an LLU seal on the outward-facing side for maximum contamination protection with a lighter-contact LLB seal inward to retain grease and minimize drag from the inside out.
At 15mm x 30mm x 7mm, the MR 15307 covers a non-standard bearing size found in specific hub, crank, and suspension linkage applications where common 6xxx series bearings won't fit. ABEC-5 precision makes it an appropriate choice for components where dimensional accuracy directly affects performance and feel over time. For mechanics who need an exact dimensional match with a quality pedigree, the MR 15307 is the bearing to reach for.
All the specs
MPN BB MR 15307 LLU/LLB A5CN-BAG
- Bearing Number
- MR 15307
- Inner Diameter
- 15mm
- Outer Diameter
- 30mm
- Width
- 7mm
- Tolerance
- ABEC-5
- Seal Configuration
- LLU (outward) + LLB (inward)
- Ball Material
- High-precision chromium steel
- Application
- Hubs, cranks, suspension linkages
Good questions
Get to know Enduro
There's more to Enduro than this one product. Our Enduro page has the full Enduro lineup we carry and more about the brand.
Visit the Enduro page →What is the difference between ABEC-3 and ABEC-5 precision?
ABEC-5 has tighter tolerances for bore, outer diameter, and runout than ABEC-3. The result is a bearing that spins more smoothly and fits more precisely in the housing. For high-speed or precision applications, the upgrade from ABEC-3 to ABEC-5 is meaningful.
Why does the MR 15307 use both LLU and LLB seals?
The LLU seal on the outward side blocks contamination from entering the bearing. The lighter-contact LLB seal on the inward side retains grease without adding unnecessary drag from that direction. The combination gives you maximum protection with minimum resistance.
How do I confirm the MR 15307 fits my application?
Measure your existing bearing with calipers. If the inner diameter is 15mm, outer diameter 30mm, and width 7mm, this is the correct size. Verify the part number on your existing bearing if visible.
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