BMW 39206852678 Rear Suspension Reinforcement Bar
fits model: I3, Cross. make: Bmw. year: 2014–2021.
( Manufacturer Part Number: 39206852678 ), ( Year: 2016 ), ( Storage Location: Rof15b4 ), ( Chassis: I01 ), ( Body Style: 4dr Hatchbk ), ( Interior Color: Fabric/sensatec Electronic/carum-gray ), ( Engine: 600cc ), ( Transmission: Automatic ), ( Oe/oem Part Number: 39-20-6-852-678; 3920-6852678; 3920 6852678 ), ( Country Of Origin: Germany ), ( Type: Reinforcement ), ( Vehicle Color: Fluid Black )
Review BMW Rear Suspension Reinforcement Bar Oem fits CROSS I3 2014–2021
The **BMW 39206852678 Rear Suspension Reinforcement Cross Bar (2014 2021 i3)** is a high-performance, precision-engineered aftermarket component designed exclusively for BMW s electric i3 platform, offering enhanced structural integrity and rigidity to the rear suspension system. Crafted from high-grade, cold-forged steel, this cross bar is engineered to reinforce the i3 s rear axle assembly, mitigating flex and improving handling dynamics particularly in high-speed maneuvers, aggressive cornering, or overloaded conditions. The part is meticulously machined to fit seamlessly within the i3 s rear subframe, ensuring a snug integration with the existing suspension mounts, driveshaft tunnel, and battery tray supports. Its robust construction not only enhances the vehicle s stability but also contributes to a more refined driving experience by reducing unwanted body roll and chassis deformation under dynamic loads. Ideal for enthusiasts seeking to optimize their i3 s performance, this cross bar is a critical upgrade for those who demand precision engineering and durability in their electric vehicle. Whether for daily driving, track use, or long-distance travel, the 39206852678 cross bar delivers a subtle yet significant improvement in structural stiffness, making it a must-have for i3 owners who prioritize both performance and long-term reliability.
### **Pros and Cons of Buying a BMW i3 Rear Suspension Reinforcement Cross Bar (2014 2021 Models)**
#### **Overview**
The BMW i3 (2014 2021) is a popular electric vehicle known for its unique design, lightweight carbon-fiber body, and efficient performance. However, some owners and enthusiasts have reported issues with the rear suspension, particularly in terms of stiffness and durability. The **rear suspension reinforcement cross bar** is an aftermarket or factory-upgraded component designed to improve rigidity, handling, and overall structural integrity.
---
### **Pros of Installing a Rear Suspension Reinforcement Cross Bar**
1. **Enhanced Structural Rigidity**
- The i3 s rear suspension is relatively soft compared to traditional BMWs, leading to body roll and a less connected driving experience. A cross bar reinforces the rear subframe, reducing flex and improving handling precision.
- This is particularly beneficial for those who enjoy spirited driving or track use, as it minimizes chassis deformation under load.
2. **Improved Handling and Stability**
- A stiffer rear suspension can lead to better weight distribution, particularly when accelerating or braking hard. This reduces understeer and makes the i3 feel more planted on the road.
- Some drivers report a more "BMW-like" driving dynamics, with quicker steering response and less body lean during cornering.
3. **Potential Safety Benefits**
- While the i3 s safety is already strong (thanks to its rigid carbon-fiber body), a reinforced cross bar can further reduce torsional flex, which may indirectly improve crash performance in certain scenarios.
- Some owners also note that the cross bar can help mitigate minor suspension-related rattles or clunks over rough roads.
4. **Compatibility with Performance Modifications**
- If you plan to add weight (e.g., larger tires, aftermarket wheels, or a heavier battery) or modify the suspension (e.g., stiffer springs, lower coils), a cross bar ensures the rear end remains stable under increased stress.
- Some tuners recommend it as a prerequisite for more aggressive suspension upgrades.
5. **Potential Resale Value Boost**
- For enthusiasts or those who modify their i3s, a reinforced cross bar can be seen as a desirable upgrade, potentially increasing resale appeal to buyers who prioritize handling and rigidity.
6. **Factory-Installed Option (for Some Models)**
- BMW offered the cross bar as an optional factory upgrade in certain markets (e.g., the **i3s** or **i3 Performance** variants). If you re buying a pre-modified i3, this could be a built-in advantage.
---
### **Cons of Installing a Rear Suspension Reinforcement Cross Bar**
1. **Cost**
- Aftermarket cross bars can range from **$300 to $800 **, depending on quality and installation complexity. Factory-installed options may be more expensive if retrofitted.
- Installation often requires professional labor, adding to the total cost.
2. **Potential Weight Increase**
- While the cross bar itself is relatively light, the added rigidity can sometimes lead to a slightly firmer ride, which may not be ideal for those who prefer a plush, compliant suspension.
- Some owners report a slight reduction in comfort over rough roads, though this is subjective.
3. **Compatibility Issues with Some Suspension Setups**
- If you ve already modified your suspension (e.g., with aftermarket springs or dampers), a cross bar may not always integrate perfectly, requiring additional adjustments.
- In rare cases, improper installation could lead to binding or interference with other components.
4. **Mixed Owner Experiences**
- Not all i3 owners notice a significant difference in handling after installing a cross bar. Some report minimal improvements, while others feel it s a worthwhile upgrade.
- A few users have mentioned that the cross bar can amplify minor suspension noises (e.g., strut mounts) rather than eliminate them.
5. **Limited Impact on Severe Modifications**
- While the cross bar helps, it is not a substitute for more extensive chassis or suspension upgrades (e.g., full roll cage, custom subframe, or track-oriented suspension).
- For extreme performance tuning, additional modifications may still be necessary.
6. **Potential for Overkill on Stock Suspension**
- If you re not planning to push the i3 hard (e.g., daily commuting, light spirited driving), the benefits of a cross bar may not justify the cost.
- The i3 s stock suspension is already decent for an EV, and many owners find it adequate for normal use.
---
### **Conclusion**
The **rear suspension reinforcement cross bar** is a **niche but valuable upgrade** for BMW i3 owners who prioritize handling, rigidity, and a more connected driving experience. It is particularly beneficial for:
- Enthusiasts who enjoy spirited driving or track use.
- Those planning to add weight or modify the suspension further.
- Buyers who want a more "BMW-like" feel in terms of chassis stiffness.
However, it is **not a necessity** for casual drivers or those who prefer comfort over performance. The cost and subjective benefits mean it s best suited for **modified or performance-oriented i3s**.
If you re considering one, **research reputable manufacturers** (e.g., **BMW M Performance, i3 Performance, or high-quality aftermarket brands**) and ensure proper installation. For most stock i3 owners, the stock suspension is already adequate, but for those who want to push the limits, the cross bar is a worthwhile consideration.
---
### **Final Recommendation**
- **Buy it if:** You plan to modify your i3 s suspension, enjoy aggressive driving, or want a stiffer chassis for better handling.
- **Skip it if:** You use the i3 primarily for daily commuting, prefer comfort over performance, or are on a tight budget.
- **Best for:** **i3s, i3 Performance, or heavily modified i3s** where rigidity is a priority.
For the average i3 owner, the cross bar is **not essential**, but for those who want to extract more performance from their vehicle, it can be a **smart investment**. Always weigh the cost against your driving needs before purchasing.
Details:
BMW Porsche Audi VW Other Makes. Condition: Used. Country/Region of Manufacture: Germany. Stock Number: 26043.
Manufacturer Part Number. Mileage: 87636. Storage Location: ROF15B4. Warranty covers the part only; labor and installation costs are not covered.
part #: 39206852678 prices
- $56.10-$116.76
specifications frontbumperus:
- for models: I3, Cross
- for makes: Bmw
- for years: 2014-2021
- mpn: 39206852678
- year: 2016
- storage location: Rof15b4
- chassis: I01
- body style: 4dr Hatchbk
- interior color: Fabric/sensatec Electronic/carum-gray
- engine: 600cc
- transmission: Automatic
- oe/oem part number: 39-20-6-852-678; 3920-6852678; 3920 6852678
- country of origin: Germany
- type: Reinforcement
- vehicle color: Fluid Black
seller frontbumperus:
- # reviews: 77115
- rating: 99.9%
- city: Rancho Cordova, California
offer frontbumperus:
- availability: In Stock
- sold: 0
- started: March 30, 2026
- options: Ship-to-home
- best offers: True
- quantity: 1
payments frontbumperus:
- other
- check
- cash
- money order
- wallet: Google-pay
- credit card: Discover
returns frontbumperus:
- paid by: Buyer
- time: 30 Days
- policy: Returns Accepted
shipping frontbumperus:
- service: USPS Ground Advantage, UPS Ground
- type: Fixed
- carrier: USPS, UPS
- cost: $0.00
- class: Standard
- transit: 3-7 Days
general frontbumperus:
- condition: Used
- Exterior Parts Accessories > Bumpers Components > Bumpers Reincements
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