1. Antique, Vintage, Historic Motorcycle Parts For Sale
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  3. BMW 513840ETN

BMW 513840ETN Swing Arm Driveshaft R100/7

fits model: R100. make: Bmw.

513840etn Bmw R100/7 Swing Arm With Driveshaft

( Manufacturer Part Number: 513840ETN ), ( Part Type: Swing Arm Driveshaft ), ( Machine Type: Street Motorcycle ), ( Color: Black ), ( Material: Steel ), ( Vintage Part: Yes ), ( Placement On Vehicle: Rear )

Review BMW R100/7 Swing Arm Driveshaft fits R100

The **BMW R100/7 Swing Arm Driveshaft (Part Number: 513840ETN)** is a meticulously engineered component designed to ensure seamless power transfer and optimal performance in the legendary BMW R100/7 motorcycle, particularly those equipped with the classic air-cooled, twin-cylinder engine. This driveshaft is a critical element of the motorcycle s rear suspension system, connecting the transmission to the swing arm and facilitating smooth, responsive power delivery to the rear wheel. Crafted from high-quality, durable materials, this driveshaft is built to withstand the rigors of daily riding, whether navigating winding mountain roads, cruising on open highways, or tackling off-road adventures. Its robust construction minimizes vibration and flex, enhancing both comfort and handling precision, while its precise engineering ensures minimal energy loss during power transmission, contributing to the R100/7 s renowned balance of power and efficiency. The driveshaft s design incorporates a universal joint at each end, allowing for smooth articulation as the swing arm moves during suspension travel, thereby reducing wear on both the driveshaft and the transmission. This part is an essential replacement for those restoring or maintaining their R100/7, as it directly impacts ride quality, driveline integrity, and overall mechanical reliability. Whether restoring a vintage classic or upgrading an existing setup, the **513840ETN** driveshaft exemplifies BMW s commitment to precision engineering, delivering a component that not only fits seamlessly into the motorcycle s heritage but also ensures long-term durability and performance.

### **Pros and Cons of Buying a BMW R100/7 Swing Arm Driveshaft (Part Number: 513840ETN)**

#### **Pros:**

1. **OEM Quality and Fitment** This is an original BMW part, meaning it is designed specifically for the R100/7, ensuring proper fitment and compatibility with the bike s drivetrain. Aftermarket parts may not align as precisely, leading to potential issues like misalignment or premature wear.

2. **Durability and Longevity** BMW s manufacturing standards for OEM components are generally high, meaning this driveshaft should last the life of the bike if properly maintained. It is built to withstand the stresses of motorcycle use, including vibrations and torque.

3. **Reliability** Since it is a genuine BMW part, it is less likely to fail unexpectedly compared to lower-quality aftermarket alternatives. This reduces the risk of a sudden breakdown, which can be dangerous while riding.

4. **Ease of Installation** Being an OEM part, it is designed to work seamlessly with the bike s existing components. This simplifies installation, especially if you are replacing a worn-out or damaged driveshaft. BMW s engineering ensures that the part integrates well with the swingarm, rear wheel, and transmission.

5. **Resale Value** If you ever decide to sell the bike, having OEM parts can make it more appealing to buyers who prefer fully original or well-maintained motorcycles. This can help retain or even increase the bike s resale value.

6. **Warranty Coverage** If purchased from an authorized BMW dealer or a reputable seller, this part may come with a warranty, providing peace of mind in case of defects. Aftermarket parts often lack such guarantees.

7. **Performance Consistency** The driveshaft is engineered to work optimally with the R100/7 s drivetrain, ensuring smooth power delivery and reducing unnecessary wear on other components like the transmission or rear suspension.

8. **Aesthetic and Originality** For enthusiasts who value the bike s originality, using an OEM part preserves the motorcycle s factory appearance and specifications. This can be important for purists or those who ride for classic appeal.

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#### **Cons:**

1. **Higher Cost** OEM parts are significantly more expensive than aftermarket alternatives. The price of this BMW driveshaft will likely be several times higher than a comparable aftermarket part, which can be a major drawback for budget-conscious buyers.

2. **Limited Availability** Genuine BMW parts, especially for older models like the R100/7, may not be as easily accessible as aftermarket options. You may need to order it from a specialized dealer or an online marketplace, which could involve shipping delays or higher costs.

3. **Potential for Overkill** If the driveshaft is not the primary issue (e.g., the problem lies elsewhere in the drivetrain, such as the transmission or rear sprocket), replacing just the driveshaft may not fully resolve the problem. This could lead to repeated maintenance costs if the underlying issue is not addressed.

4. **Weight Considerations** While not a major factor for most riders, OEM parts are often slightly heavier than aftermarket alternatives, which may have been optimized for weight savings. This could marginally affect the bike s handling or fuel efficiency, though the difference is usually negligible.

5. **Depreciation** Like all motorcycles, the R100/7 depreciates over time. If you are planning to keep the bike long-term, the high upfront cost of OEM parts may not be fully justified, especially if the bike s overall value declines.

6. **Maintenance Requirements** While durable, the driveshaft will still require periodic inspection and lubrication to prevent wear. Neglecting maintenance could lead to premature failure, negating the benefits of using an OEM part.

7. **Time-Consuming Replacement** Replacing a driveshaft on an R100/7 can be a labor-intensive process, especially for inexperienced mechanics. It may require removing the rear wheel, swingarm, and possibly the transmission, which can take several hours. If you are not comfortable with mechanical work, you may need to pay a professional, adding to the cost.

8. **Market Saturation** For older models like the R100/7, the market for OEM parts is smaller, meaning fewer sellers may offer competitive pricing or warranties. You may end up paying a premium simply because the part is rare.

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### **Conclusion:**

The BMW R100/7 swing arm driveshaft (513840ETN) is an excellent choice if you prioritize **quality, reliability, and long-term durability** over cost savings. It is the best option for riders who want to maintain the bike s original specifications, preserve its value, and avoid potential compatibility issues with aftermarket parts. The OEM part ensures a seamless fit and reduces the risk of drivetrain problems, making it a wise investment for those who plan to keep the motorcycle for many years.

However, the **high cost** and **limited availability** make it less ideal for budget-conscious buyers or those who are not committed to long-term ownership. If the driveshaft is the only failing component and you are on a tight budget, an **aftermarket part from a reputable manufacturer** (such as BMW Motorrad, BMW Classic, or a trusted third-party supplier) could be a more practical alternative, provided it meets the same quality standards.

For most serious R100/7 owners, the **pros outweigh the cons**, especially if the bike is a cherished classic or a project intended for long-term use. The peace of mind and reliability of an OEM part are invaluable for riders who demand nothing less than the best for their motorcycle.

### **Recommendation:** - **Buy the OEM driveshaft (513840ETN) if:**

- You value originality and long-term reliability above cost.

- The bike is a well-maintained classic or a project you intend to keep for years.

- You have access to an authorized BMW dealer or a trusted seller offering warranty coverage.

- You are prepared to invest in genuine parts to ensure optimal performance and resale value.

- **Consider an aftermarket alternative if:**

- You are on a tight budget and the driveshaft is the only failing component.

- You have verified that the aftermarket part is from a reputable brand with good reviews and warranty support.

- You are comfortable with the trade-off between cost and originality, and the aftermarket part meets your performance needs.

Ultimately, the decision depends on your priorities whether you prefer **quality and longevity** (OEM) or **cost-effectiveness and practicality** (aftermarket). For the R100/7, the OEM part is the safest and most satisfying choice for enthusiasts.

Details:

It came off my motorcycle because I converted mine to a single swing arm and this is dual. Ready to plug and play Perfect working condition, no cracks, the splines are in excellent binds or any other issues. 1978 BMW R/100 but compatible with others. This arm came off of my BMW R100/7 perfect working condition, no cracks, the splines are in excellent binds or any other issues.

Used in excellent condition. It is ready to go.

part #: 513840etn price

  • $175.00

specifications cyclevintagee:

  • for models: R100
  • for makes: Bmw
  • mpn: 513840etn
  • part type: Swing Arm Driveshaft
  • machine type: Street Motorcycle
  • color: Black
  • material: Steel
  • vintage part: Yes
  • placement on vehicle: Rear

offer cyclevintagee:

  • started: February 26, 2026
  • best offers: True
  • quantity: 1
  • sold: 0
  • availability: In Stock
  • options: Ship-to-home

payments cyclevintagee:

  • credit card: Discover
  • wallet: Paypal
  • other

general cyclevintagee:

  • Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories
  • condition: Used

seller cyclevintagee:

  • city: Chatsworth, California
  • rating: 100.0%
  • # reviews: 41

returns cyclevintagee:

  • policy: No Returns

shipping cyclevintagee:

  • cost: $129.71
  • carrier: USPS
  • class: Standard
  • service: USPS Ground Advantage
  • type: Calculated
  • transit: 6-12 Days
for models: r100, for makes: bmw, part type: swing arm driveshaft, machine type: street motorcycle, vintage part: yes, placement on vehicle: rear,
category: motorcycle parts > motorcycle scooter parts accessories, color: black, material: steel, sku: 20838899397973752,
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1 offer $175.00 USD
  • Used. Offer #1 priced at $175.00 + $137.61 shipping estimate = $312.61* total. Used in excellent condition. Perfect working condition, no cracks, the splines are in excellent condition, no binds or any other issues.+$137.61 shipping

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