FOX 803-04-204 Sls Coil Rear Shock Spring 500 Lb. 2.65 67MM

( Brand: Fox ), ( Manufacturer Part Number: 803-04-204 ), ( Part Type: Coil ), ( Shock Type: Coil Shock ), ( Color: Orange )

Review FOX Sls Coil Rear Shock Spring 500 Lb. 2.65 Inch 67mm Stroke Orange

The **Fox 803-04-204 SLS Coil Rear Shock** is a high-performance, precision-engineered suspension component designed specifically for demanding off-road and aggressive trail riding. Part of Fox s elite **SLS (Special Low Speed) line**, this coil-over shock delivers an unmatched blend of damping control, durability, and adaptability, making it an ideal choice for riders pushing the limits on technical terrain, enduro races, or heavy-duty trail applications. Built with Fox s proprietary **SLS damping technology**, this shock features a **500mm travel** a generous stroke length that ensures deep, controlled articulation over rough obstacles while maintaining stability under heavy loads. The **2.65-inch (67mm) spring diameter** provides a robust yet compliant platform, balancing stiffness for aggressive cornering with plush comfort for long descents, making it well-suited for riders seeking both performance and comfort.

The **803 series** is renowned for its **adjustable rebound and compression damping**, allowing riders to fine-tune the shock s response to their weight, riding style, and terrain conditions. The **SLS coil-over design** integrates a high-quality **helical spring** with Fox s **SLS damping fork**, which features a **low-speed damping (LSD) valve** for ultra-smooth, progressive resistance at slow speeds critical for maintaining control on technical descents or when navigating tight switchbacks. The shock s **aluminum body** is both lightweight and robust, constructed from high-grade aerospace-grade materials to withstand the rigors of extreme off-roading, including repeated impacts, dust, and moisture. Additionally, the **sealed cartridge system** ensures long-term reliability by protecting internal components from contamination, while the **adjustable preload** allows riders to dial in the optimal spring tension for their specific weight and riding preferences.

For riders who demand the best in suspension performance, the **Fox 803-04-204** is engineered to handle the most challenging conditions with confidence. Whether tackling steep, rocky descents, deep sand, or technical singletrack, this shock delivers **exceptional energy absorption, consistent rebound control, and minimal bottoming-out**, even under heavy loads. The **67mm spring diameter** strikes a balance between stiffness and compliance, reducing body roll in aggressive turns while still absorbing impacts effectively. This makes it particularly well-suited for **dual-sport bikes, enduro rigs, and adventure touring setups** where versatility and durability are paramount. With Fox s reputation for innovation and precision, this shock is not just an upgrade it s a game-changer for riders who refuse to compromise on performance.

The Fox 803-04-204 SLS Coil Shock (part of the SLS platform) is a high-performance rear shock designed for downhill mountain biking, enduro, and aggressive trail riding. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

---

1. **Superior Performance on Rough Terrain**

The SLS platform is renowned for its ability to handle extreme downhill conditions, including steep descents, rough trails, and technical descents. The shock s robust build and advanced tuning make it ideal for riders pushing the limits of their bikes.

2. **High-Quality Materials and Build**

Fox uses premium materials, including high-grade steel and advanced coatings, to ensure durability and longevity. The shock is built to withstand heavy use and harsh conditions without failing.

3. **Adjustable Compression and Rebound**

The SLS platform offers precise adjustments for both compression (low-speed and high-speed) and rebound, allowing riders to fine-tune the shock s performance to match their weight, riding style, and terrain. This customization is crucial for optimizing comfort and control.

4. **Sealed and Maintenance-Free**

The SLS coil shock is a sealed unit, meaning it requires minimal maintenance compared to open-air shocks. This reduces the risk of dirt and debris affecting performance and extends the shock s lifespan.

5. **Compatibility with High-Performance Bikes**

The shock is designed to work seamlessly with high-end downhill and enduro bikes, providing the necessary support and stability for aggressive riding. It is compatible with a wide range of frame designs and suspension linkages.

6. **Reliability in Extreme Conditions**

Fox shocks are known for their reliability, even in extreme conditions such as high-speed descents or repeated impacts. The SLS platform is particularly well-suited for riders who demand consistent performance under stress.

7. **Warranty and Customer Support**

Fox offers a robust warranty (typically 2 years) and excellent customer support, which can be invaluable if issues arise. Their reputation for quality also means that parts and service are widely available.

---

1. **High Cost**

The Fox 803-04-204 SLS coil shock is a premium product, and its price reflects that. It is significantly more expensive than entry-level or mid-range shocks, which may be a barrier for budget-conscious riders or those who do not ride aggressively enough to justify the investment.

2. **Overkill for Mild or Casual Riding**

If you primarily ride smooth trails, cross-country, or casual enduro, the SLS shock may be unnecessarily aggressive and harsh. Its tuning is optimized for downhill and technical riding, which can lead to a rough ride on less demanding terrain.

3. **Weight**

The SLS coil shock is heavier than many air-sprung shocks or lighter coil shocks. While this adds to the bike s stability, it can also make the bike feel sluggish or harder to maneuver, especially on climbs or technical sections where agility is important.

4. **Complexity of Adjustments**

The extensive adjustability of the SLS platform can be overwhelming for beginners or riders who prefer simplicity. Tuning the shock correctly requires an understanding of suspension mechanics, and incorrect settings can lead to poor performance or even damage.

5. **Potential for Overuse Damage**

While the shock is durable, pushing it to its limits repeatedly (e.g., frequent high-speed descents or extreme jumps) can accelerate wear and tear. Riders who abuse the shock may find they need to replace it sooner than expected.

6. **Limited Aftermarket Support**

Compared to more common shocks (e.g., RockShox or DT Swiss), the Fox SLS platform has a smaller aftermarket community. This means fewer third-party parts, modifications, or tuning guides are available, which can be a drawback for riders who want to customize their setup further.

7. **Installation and Setup Knowledge Required**

Proper installation and initial setup (e.g., sag adjustment, linkage alignment) are critical for the shock to perform optimally. Riders without experience may need to consult a professional, adding to the cost and complexity.

---

The Fox 803-04-204 SLS coil shock is one of the best options available for riders who demand the highest level of performance in downhill, enduro, and aggressive trail riding. Its strengths lie in its durability, adjustability, and ability to handle extreme conditions. However, its high cost, weight, and complexity make it less suitable for casual riders or those who primarily ride smooth terrain. If you are a serious downhill or enduro rider who prioritizes performance and reliability above all else, this shock is an excellent investment. For riders who do not push their bikes to the limit, a more affordable or lighter shock may be a better fit.

---

- You are a downhill or enduro rider who frequently rides steep, technical, or rough terrain.

- You value precision tuning and the ability to customize your suspension to match your riding style and conditions.

- You are willing to invest in a high-performance component that will last for many years with proper care.

- You have the experience or are willing to learn how to properly set up and maintain the shock.

- You primarily ride cross-country, smooth trails, or casual enduro where a lighter or more forgiving shock would be more appropriate.

- You are on a tight budget and cannot justify the cost of a premium downhill shock.

- You lack experience with suspension tuning and are uncomfortable with the complexity of adjusting the shock.

- You prefer a shock with a larger aftermarket community or more widespread availability of parts.

For riders in the middle ground (e.g., enduro riders who occasionally hit steep descents), you might consider a mid-range air shock like the Fox Float or RockShox Deluxe, which offers a balance of performance and adjustability at a lower cost. Always ensure the shock is compatible with your bike s frame and linkage before purchasing.

Details:

Otherwise in great shape. Used for one season on a NCO Range. Small scuff on the 500# mark. Went down to 475# and I m never looking back.

Its a spring.

part #: 80304204 price

• $144.00

specifications ribicycl:

• brand: Fox
• mpn: 803-04-204
• part type: Coil
• shock type: Coil Shock
• color: Orange

payments ribicycl:

• credit card: Discover
• money order
• wallet: Apple-pay
• other

returns ribicycl:

• policy: No Returns

general ribicycl:

• condition: Used
• Cycling > Bicycle Components Parts > Rear Shocks

seller ribicycl:

• city: Johnson City, Tennessee
• # reviews: 226
• rating: 100.0%

shipping ribicycl:

• cost: $10.41
• service: UPS Ground
• carrier: UPS
• class: Standard
• transit: 4-10 Days
• type: Calculated

offer ribicycl:

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

Fox 803-04-204 Is Similar To:

• 039-03-005 Fox Shox Diameter Tlg Spring (29.3% similar) ...(April 6th, 2019)
• 039-03-011 Fox Steel Coil Rear Shock Spring Stroke (55.2% similar) You can trust us. So you'll have to find our phone number with a magical search engine machine of your choice. Lancaster pa, 17603 and out west at 3481 old conj rd. Will walk you through creating a label from there...(September 6th, 2018)
• 039-05-132-kit Fox Steel Coil Spring Blue (32% similar) Lancaster pa, 17603 and out west at 3481 old conj rd. You can trust us. Will walk you through creating a label from there. Replacement steel springs for Fox suspension forks. So you'll have to find our phone number with a magical search engine machine of your choice...(October 30th, 2018)
• 039-05-134-kit Fox Steel Coil Spring Yellow (31.5% similar) Lancaster pa, 17603 and out west at 3481 old conj rd. So you'll have to find our phone number with a magical search engine machine of your choice. Replacement steel springs for Fox suspension forks. Will walk you through creating a label from there. You can trust us...(October 30th, 2018)
• 039-09-010 Fox Steel Rear Shock Spring Fits Stroke (47.8% similar) 8-8 Mon-Fri, 12-4 sat sun est chat with us...(September 6th, 2018)
• 039-12-007 Fox Shox Diameter Tlg Spring (22.8% similar) ...(October 17th, 2018)
• 039-94-038 Fox Sls Coil Rear (30.4% similar) Lancaster pa, 17603 and out west at 3481 old conj rd. So you'll have to find our phone number with a magical search engine machine of your choice. You can trust us. Fox super light steel spring in orange item . Will walk you through creating a label from there worldwide cycle...(October 11th, 2017)
• 3pos-adj Fox Float Dps Evol Rear Shock Off Stumpjumper (37.7% similar) Came on bike but was removed shortly after receiving to run a different shock. Comes as pictured Fox float DPs evil rear shock 3POS-ADJ 210X50 off stump jumper 29 long travel...(March 22nd, 2019)
• 687928181440 Fox New Dhx Boostvalve Rear Shock Mtb Lbs (33.3% similar) A and Taiwan...(August 26th, 2018)
• 687928181457 Specialized New Fox Brain Future Rear Shock Mtb (25% similar) A and Taiwan...(August 26th, 2018)
• 803-00-704 Fox Air Spring Seal Kit For Drcv Forks (34.6% similar) Will walk you through creating a label from there. Air spring seal kits for Fox suspension repair and rebuild. So you'll have to find our phone number with a magical search engine machine of your choice. Lancaster pa, 17603 and out west at 3481 old conj rd. You can trust us...(August 25th, 2018)