SPORTS PARTS INC 8573-S398987-23 Spi Radius Rod Sport Lower Ski Doo

( Brand: Sports Parts Inc ), ( Manufacturer Part Number: 8573-S398987-23 ), ( Part Type: Rod )

Review SPORTS PARTS INC Spi Radius Rod Ski doo Sport Snowmobile Lower fits LEGEND 500 2002–2004

The **Sports 8573-S398987-23 SPI Radius Rod** is a precision-engineered, high-performance replacement part designed exclusively for the **2002 2004 Ski-Doo Legend 500 Sport**, specifically tailored to enhance the lower control arm assembly. Crafted from durable, high-grade steel, this rod is built to withstand the rigorous demands of off-road and trail riding, ensuring reliability and longevity even under extreme conditions. The **SPI (Ski-Doo Performance Interface) Radius Rod** features a meticulously machined, contoured design that optimizes suspension geometry, improving handling, stability, and overall ride quality. Its seamless integration with the existing suspension system allows for smoother articulation, reduced binding, and a more responsive steering feel, making it an ideal upgrade for riders seeking enhanced performance and control. Whether navigating tight turns, rough terrain, or aggressive jumps, this rod delivers a noticeable improvement in maneuverability while maintaining the iconic power and agility of the Legend 500 Sport. Perfect for both stock and modified setups, the **Sports 8573-S398987-23** is a must-have component for enthusiasts looking to fine-tune their Ski-Doo s suspension dynamics and elevate their riding experience.

**Pros and Cons of buying a Sports 8573-S398987-23 SPI Radius Rod for a 2002-2004 Ski-Doo Legend 500 Sport Lower**

The SPI radius rod you re considering is a performance-oriented aftermarket part designed to enhance the handling and stability of your Ski-Doo Legend 500 Sport. Here are the key advantages:

1. **Improved Handling and Stability** The SPI radius rod is engineered to reduce body roll and improve cornering precision, making the ATV more responsive in tight turns and rough terrain. This is particularly beneficial for riders who prioritize agility and control.

2. **Durability and Strength** SPI parts are known for their high-quality construction, often featuring forged or heat-treated materials that resist warping and fatigue better than stock components. This can extend the lifespan of your suspension system, especially if you ride aggressively or off-road frequently.

3. **Compatibility with Other Modifications** If you ve already invested in other performance upgrades (e.g., stiffer shocks, wider tires, or a lowered frame), the SPI radius rod can complement these changes by maintaining proper geometry and reducing unwanted movement.

4. **Reduced Body Roll** The stock radius rod on older Ski-Doos can flex under heavy loads or sharp inputs, leading to a mushy feel. The SPI rod is designed to minimize this, providing a firmer, more predictable ride.

5. **Easier Installation** While not universally true for all aftermarket parts, SPI components are often designed with modern manufacturing techniques, making them easier to install than some older or lower-quality alternatives. The fitment is typically precise for the specified models.

6. **Positive Community Feedback** Many riders report noticeable improvements in ride quality and handling after installing SPI radius rods, particularly in off-road or aggressive riding scenarios. User reviews and forums often highlight its effectiveness for this generation of Ski-Doo.

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1. **Cost** Aftermarket performance parts like this are typically more expensive than OEM replacements. The price may be a barrier for riders on a tight budget, especially since the part itself may not be cheap, and installation could require additional labor if you re not mechanically inclined.

2. **Potential for Over-Rigidness** While reducing body roll is desirable, some riders may find the SPI rod too stiff for their riding style, particularly on rough or uneven terrain. This can lead to a harsher ride quality or increased stress on other suspension components if the rest of the setup isn t balanced.

3. **Installation Complexity** Replacing the radius rod may require removing the subframe, adjusting the steering linkage, and ensuring proper alignment. If you re not experienced with ATV suspension work, this could be a time-consuming or tricky process, potentially leading to mistakes if not done correctly.

4. **Limited Aftermarket Support** Unlike OEM parts, SPI components may not have widespread availability for repairs or replacements if something goes wrong. You ll need to rely on specialized aftermarket suppliers or forums for troubleshooting.

5. **Potential for Voiding Warranty** If your Ski-Doo is still under warranty (unlikely for a 2002-2004 model, but worth noting), installing aftermarket parts could void coverage, especially if the manufacturer considers it a "non-original" modification.

6. **Mixed Opinions on Long-Term Benefits** Some riders report that while the SPI rod improves handling, the gains may be marginal if other suspension components (e.g., shocks, bushings) are worn or outdated. Expectations should be realistic this is a targeted upgrade, not a complete suspension overhaul.

7. **Weight Considerations** Aftermarket radius rods are often heavier than stock parts due to their reinforced construction. While this adds strength, it may slightly affect the ATV s overall weight distribution, which could influence maneuverability in extreme conditions.

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The SPI radius rod is a worthwhile upgrade for riders who want to enhance the handling and stability of their 2002-2004 Ski-Doo Legend 500 Sport, particularly if they engage in aggressive off-road riding or have already modified other suspension components. The benefits in terms of reduced body roll and improved cornering precision are substantial for those who prioritize performance over comfort. However, the cost, installation complexity, and potential for over-rigidness should be carefully weighed against your riding style and budget.

If you re primarily a trail rider or prefer a softer, more forgiving ride, the gains may not justify the expense. Conversely, if you re looking to push the limits of your ATV s capabilities whether for racing, heavy-duty hauling, or competitive riding the SPI rod is a solid choice.

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- You ve already invested in other performance upgrades (e.g., stiffer shocks, wider tires, or a lowered frame).

- You ride aggressively, frequently tackle rough terrain, or prioritize handling over comfort.

- You re comfortable with suspension work or have access to a mechanic experienced with aftermarket parts.

- You re willing to spend the extra cost for measurable improvements in stability and responsiveness.

- You re on a tight budget and the cost doesn t align with your riding needs.

- You prefer a softer, more forgiving ride and aren t concerned with aggressive handling.

- You re not confident in installing the part yourself, and labor costs would make the upgrade prohibitive.

- Your current suspension components (shocks, bushings) are worn and could benefit from a full rebuild before adding a stiffer radius rod.

- If you re unsure, test-ride an ATV with a similar SPI rod to see if the handling style suits your preferences.

- Pair the upgrade with other complementary modifications (e.g., upgraded bushings, shocks, or a track bar) for a more balanced performance.

- Check for used or refurbished SPI rods to reduce costs, though ensure they re in good condition before purchasing.

Ultimately, the SPI radius rod is a high-quality, performance-focused part that delivers tangible benefits for the right rider. Weigh the pros and cons against your specific needs, and proceed with confidence if the upgrade aligns with your goals.

Details:

Replacement radius rod manufactured by Sports Parts, Sold each. Parts without fitment are to be assumed universal and may require vehicle modification. 2002 - 2003 Ski-Doo Legend 500 Fan Lower. This is helpful if you are buying multiple items.

Brand: Sports Parts Inc, model Number: 8573-S398987-23. I need to exchange an item. 2004 - Ski-Doo Legend 550 Fan Lower. SPI Radius Rod for 2002 - 2004 Ski-Doo Legend 500 Sport Snowmobile Lower: Application: Lower.

part #: 8573s39898723 price

• $43.77

specifications snowmobileshocksoi:

• for models: 500, Legend
• for makes: Ski-doo
• for years: 2002-2004
• brand: Sports Parts Inc
• mpn: 8573-s398987-23
• part type: Rod

seller snowmobileshocksoi:

• rating: 99.9%
• # reviews: 84457
• city: Indiana, US

returns snowmobileshocksoi:

• paid by: Seller
• time: 30 Days
• policy: Returns Accepted

offer snowmobileshocksoi:

• quantity: 9
• availability: In Stock
• options: Ship-to-home
• started: May 3, 2026
• sold: 0

general snowmobileshocksoi:

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

payments snowmobileshocksoi:

• other
• credit card: Discover
• wallet: Google-pay

shipping snowmobileshocksoi:

• class: Standard
• cost: $0.00
• type: Fixed
• service: Standard
• transit: 3-5 Days

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