Alternator BMW K75 K100 K1100 R850 R1100 R1150 GS RT RS 12V 50A 12312306020
Alternator BMW K75 K100 K1100 R850 R1100 R1150 GS RT RS 12V 50A 12312306020
SKU:400-24131
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BMW Motorcycle Alternator
Fits K75, K100, K1100 & Oilhead Boxers (50 Amp)
Keep your classic BMW touring machine powered with this high-quality replacement **50 Amp Alternator**. Designed for the legendary "Flying Brick" **K-Series (K75, K100, K1100)** and the robust "Oilhead" **R-Series (R850, R1100, R1150)**, this unit ensures reliable charging for your heated grips, lights, and ABS systems.
This **Bosch Style** alternator is a direct bolt-on replacement. It comes complete with a **4-groove serpentine pulley**, matching the factory drive belt system perfectly.
Key Features
- ✔ Direct Fit: Replaces Bosch 0123105001.
- ✔ High Output: 50 Amps for touring accessories.
- ✔ Cooling: Efficient Internal Fan (IF) design.
- ✔ Pulley Included: 4-Groove Poly-V.
Technical Specs
| Voltage: | 12 Volts |
| Amperage: | 50 Amps |
| Rotation: | CW (Clockwise) |
| Pulley: | 4-Groove Serpentine |
| Regulator: | Internal (IR) |
| SKU Reference: | 400-24131 |
Vehicle Fitment Guide
| Series | Models | Year Range |
|---|---|---|
| BMW K-Series | K75 (C, S, RT) | 1986 - 1996 |
| BMW K-Series | K100 / K1 (LT, RS, RT) | 1984 - 1993 |
| BMW K-Series | K1100 (LT, RS) | 1993 - 1999 |
| BMW R-Series | R850 / R1100 (GS, R, RS, RT) | 1993 - 2001 |
| BMW R-Series | R1150 / R1200C (GS, RT) | 1999 - 2006 |
Part Number Cross Reference
| BMW | 12-31-2-306-020, 12-31-1-342-767, 12312306020 |
| Bosch | 0-123-105-001, 0-123-105-002, 0123105001 |
| Arrowhead | ABO0364 |
| Lester | 12494 |
Frequently Asked Questions
Will this fit my 1988 K75S?
Yes, this 50A alternator is the standard replacement for all K75 models from 1986-1996.
Can I upgrade from my 33A alternator?
Yes, older K-bikes often came with 33A units. This 50A alternator is a popular plug-and-play upgrade to provide more power for accessories like heated gear.
Does it include the rubber dampers?
No, this listing is for the alternator unit itself. We highly recommend inspecting and replacing the rubber drive dampers (monkey nuts) in the engine cup when installing this new unit.
Note: Please verify your existing alternator mounting and pulley type.
Fast shipping available across the UK and Europe.
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