RPM BB Cartridge 3NL 122.5mm / 3S 124.5mm
What Is It?
The RPM BB Cartridge is a sealed cartridge bottom bracket for square-taper cranksets, designed to provide smooth crank rotation with a low-maintenance bearing system.
The product listing identifies two closely related RPM cartridge options: the 3NL 122.5mm with cups and 40–50Nm specification, and the 3S 124.5mm 40Nm version. Both are listed as RPM bottom-bracket cartridges.
Key Features
- Sealed cartridge bottom bracket
- Square-taper crank compatibility
- 122.5mm or 124.5mm spindle options
- Durable cartridge bearing system
- Available with bottom-bracket cups
- Designed for reliable everyday cycling
- Suitable for replacement and bicycle servicing
- 40–50Nm installation torque specification on the 3NL version
Specifications
| Specification |
3NL Version |
3S Version |
| Brand |
RPM |
RPM |
| Type |
Cartridge BB |
Cartridge BB |
| Spindle Length |
122.5mm |
124.5mm |
| Cups |
Included |
— |
| Torque |
40–50Nm |
40Nm |
| Crank Interface |
Square Taper |
Square Taper |
| Bearing System |
Sealed Cartridge |
Sealed Cartridge |
| Application |
Bicycle / MTB / Hybrid |
Bicycle / MTB / Hybrid |
The South African listings show the RPM BB Cartridge 3NL 122.5mm at R245 and the RPM BB Cartridge 3S 124.5mm at R230.
Benefits
-
Low maintenance: Sealed cartridge bearings help protect the bearing system from dirt and moisture.
-
Smooth operation: Provides consistent crank rotation.
-
Reliable replacement: Suitable for replacing worn or damaged cartridge bottom brackets.
-
Square-taper compatibility: Works with compatible traditional square-taper cranksets.
-
Choice of spindle length: 122.5mm and 124.5mm options allow the correct crankset/chainline configuration to be selected.
-
Straightforward servicing: Cartridge-style construction makes replacement relatively simple.
Best Suited For
Ideal for older MTB bikes, hybrid bicycles, commuter bikes, recreational bicycles, and bicycles using square-taper cranksets.
Important: The 122.5mm and 124.5mm spindle lengths are not interchangeable for every bicycle. The correct length depends on the crankset and required chainline, so match the replacement BB to the existing bottom bracket/crankset specification before ordering.
