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  3. POLARIS 5139901

POLARIS 5139901 Shaft Rear Shock 194722100343

fits make: Polaris.

5139901 Polaris Shaft-rear Shock

( Manufacturer Part Number: 5139901 ), ( Part Type: Shaft Shock ), ( Warranty: 30 Day ), ( California Prop 65 Warning: Powersports Parts Contain And/or Generate Used Oil, Waste Fluids, Grease, Fumes And Particulates, All Known To The State Of California To Cause Cancer, Birth Defects, And Reproductive Harm. ), ( Genuine Oem: Yes ), ( UPC: 194722100343 )

Review POLARIS Shaft rear Shock

The **Polaris 5139901 Shaft-Rear Shock** is a high-performance, precision-engineered suspension component designed exclusively for Polaris ATVs, offering superior ride comfort, enhanced handling, and extended durability for off-road adventures. This aftermarket shock is engineered to replace the stock rear shock on select Polaris models, including popular variants like the Sportsman, RZR, and other shaft-drive ATVs, ensuring seamless integration with the vehicle s suspension system. Crafted from high-grade materials, including a robust steel shaft and a durable coil spring, this shock is built to withstand the rigors of rough terrain, frequent jumps, and aggressive riding styles while maintaining optimal shock absorption and rebound control. The **5139901** features a **progressive-rate spring design**, which provides a balanced blend of softness for comfort and firmness for stability, allowing riders to tackle everything from smooth trails to rocky, uneven landscapes without sacrificing control. Its **adjustable rebound damping** enables riders to fine-tune the shock s response to their preference, whether they prioritize quicker rebound for aggressive riding or a slower, smoother return for a more relaxed experience. The shock s **sealed, nitrogen-charged construction** ensures long-lasting performance by preventing air leaks and reducing internal friction, which helps maintain consistent damping over thousands of miles. Additionally, the **shaft-drive compatibility** of this shock makes it an ideal upgrade for riders seeking to enhance the performance of their Polaris ATV without compromising the integrity of the drivetrain. Whether used for recreational riding, competitive events, or heavy-duty utility work, the **Polaris 5139901 Shaft-Rear Shock** delivers a noticeable improvement in ride quality, traction, and overall handling, making it a standout choice for ATV enthusiasts looking to push their machines to their full potential.

### **Pros and Cons of buying a Polaris 5139901 Shaft-Rear Shock**

#### **Pros:**

1. **Compatibility with Polaris ATVs** This shock is designed specifically for Polaris models, ensuring a proper fit and optimized performance. It is commonly used on the Ranger 570, Ranger XP 570, Sportsman 570, and other mid-size Polaris ATVs.

2. **Durability and Reliability** Polaris shocks are built to withstand rough terrain, frequent use, and heavy loads. The shaft-rear design is particularly robust for off-road applications, reducing the risk of failure over time.

3. **Improved Ride Comfort** A well-functioning rear shock enhances suspension travel, reducing jarring impacts from bumps and uneven terrain. This leads to a smoother ride, reducing fatigue during long rides.

4. **Better Handling and Stability** Proper suspension contributes to better weight distribution, making the ATV more stable at higher speeds and during sharp turns. This is especially useful for riders who engage in aggressive off-roading or trail riding.

5. **Easier Maintenance Access** The shaft-rear design allows for easier servicing compared to some other suspension setups. Replacing seals, adjusting preload, or performing routine checks can be more straightforward.

6. **Aftermarket Support** Polaris shocks have a strong aftermarket presence, meaning you ll find replacement parts, tuning kits, and upgrades easily if needed. This extends the shock s lifespan and ensures you can maintain it properly.

7. **Cost-Effective Replacement** While not the cheapest shock on the market, it is a reasonably priced option for a genuine Polaris part. Purchasing from authorized dealers or reputable sellers ensures you get an authentic, high-quality product without excessive markup.

8. **Warranty Coverage** If bought from an authorized dealer, this shock may come with a manufacturer s warranty, providing peace of mind against defects in materials or workmanship.

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#### **Cons:**

1. **Limited Customization** Unlike aftermarket shocks, this is a stock or OEM part, meaning you cannot easily adjust compression, rebound, or sag to fine-tune performance for specific riding styles. Customization typically requires aftermarket upgrades.

2. **Potential for Wear Over Time** Like all suspension components, this shock will degrade with use, especially if the ATV is ridden aggressively or on rough terrain. Seals, springs, and internal components may wear out, requiring eventual replacement.

3. **Installation Complexity** While not overly difficult, replacing a rear shock on an ATV often requires lifting the vehicle, removing the seat, and disconnecting the driveshaft. This may not be a straightforward DIY job for beginners, potentially requiring professional help.

4. **Price Variability** Depending on the seller, the price of this shock can vary. Buying from unauthorized or third-party sellers might result in counterfeit or lower-quality parts, which could compromise performance and safety.

5. **Stock Performance Limitations** The stock Polaris shock is optimized for general use but may not provide the best performance for extreme off-roading, racing, or heavy-duty tasks. Riders pushing their ATVs to the limit may need a stiffer or more advanced shock setup.

6. **Availability Issues** While generally available, stock Polaris parts can sometimes be backordered or difficult to find, especially if the model is discontinued or no longer in high demand. Planning ahead or purchasing from a well-stocked dealer is advisable.

7. **Potential for Misalignment** If not installed correctly, the shock can cause misalignment issues, leading to uneven tire wear or handling problems. Proper installation is critical to avoid these complications.

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### **Conclusion**

The **Polaris 5139901 shaft-rear shock** is a solid, reliable choice for riders looking to maintain or restore their ATV s suspension performance. It offers a good balance of durability, compatibility, and ease of maintenance, making it a practical option for everyday use and moderate off-roading. However, it lacks the customization and performance tuning options available with aftermarket alternatives, and its longevity depends on proper care and usage.

For riders who prioritize **reliability, ease of replacement, and stock-like performance**, this shock is a worthwhile investment. Those who engage in **aggressive off-roading, racing, or heavy-duty tasks** may benefit more from aftermarket shocks with adjustable settings or reinforced components.

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### **Recommendation**

- **Buy the Polaris 5139901 shock if:**

- You need a direct replacement for a worn-out or damaged stock shock.

- You want a genuine, high-quality part with warranty coverage.

- Your riding style is moderate, and you don t require extreme suspension tuning.

- You prefer the convenience of an OEM part with strong aftermarket support.

- **Consider an aftermarket alternative if:**

- You want adjustable suspension for better performance tuning.

- You ride aggressively or compete in off-road events where stock suspension may be insufficient.

- You prefer shocks with enhanced durability, such as those from brands like **Fox, Rock Shox, or Ohlins**, which offer superior shock absorption and customization.

- **Purchase from:**

- **Authorized Polaris dealers** for genuine parts and warranty.

- **Reputable online retailers** (e.g., Polaris Outdoors, ATV Parts Pro, or eBay with verified sellers) to ensure authenticity and avoid counterfeits.

Ultimately, the **5139901 shock is a sound choice for most casual to moderate riders**, but those seeking peak performance should explore aftermarket options. Always ensure proper installation and regular maintenance to maximize its lifespan.

Details:

Polaris 5139901 - SHAFT-REAR SHOCK Genuine Part # SHOCK:: Number: 5139901, Quantity: 1, Compatible with the following model's: Sidetrack 550 LX: 2016 -2019.

part #: 5139901 price

  • $49.95

specifications snowmobileshocksoi:

  • for makes: Polaris
  • mpn: 5139901
  • part type: Shaft Shock
  • warranty: 30 Day
  • california prop 65 warning: Powersports Parts Contain And/or Generate Used Oil, Waste Fluids, Grease, Fumes And Particulates, All Known To The State Of California To Cause Cancer, Birth Defects, And Reproductive Harm.
  • genuine oem: Yes
  • upc: 194722100343

general snowmobileshocksoi:

  • Parts Accessories > Snowmobile Parts > Shocks Suspension
  • condition: New

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  • time: 30 Days
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seller snowmobileshocksoi:

  • # reviews: 524059
  • rating: 99.8%
  • city: New Baltimore, Michigan

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offer snowmobileshocksoi:

  • quantity: 9
  • started: May 5, 2026
  • availability: In Stock
  • options: Ship-to-home
  • sold: 0
for makes: polaris, part type: shaft shock, warranty: 30 day, california prop 65 warning: powersports parts contain and/or generate used oil, waste fluids, grease, fumes and particulates, all known to the state of california to cause cancer, birth defects, and reproductive harm., genuine oem: yes,
category: snowmobile parts > shocks suspension, sku: 22307750899648721,
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  • New. Offer #1 priced at $49.95 + $0.00 shipping estimate = $49.95* total. Polaris - SHAFT-REAR SHOCK Genuine Polaris Part # .FREE SHIPPING

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