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  3. ROCKSHOX 18T20837519

ROCKSHOX 18T20837519 Deluxe Ultimate Trunnion Mount Rear 205X60MM Shock

18t20837519 Rockshox Super Deluxe Ultimate 205x60mm Trunnion Mount Rear Shock

( Brand: Rockshox ), ( Manufacturer Part Number: 18T20837519 ), ( Part Type: Mount ), ( Shock Type: Air Shock ), ( Eye To Eye Measurement: 205 Mm ), ( Color: Black, White, Yellow ), ( Compatible Bike Type: Mountain Bike ), ( Set Includes: Rear Shock ), ( Material: Aluminum ), ( Stroke Length: 60 Mm )

Review ROCKSHOX Super Deluxe Ultimate 205x60mm Trunnion Mount Rear Shock

The **RockShox Deluxe Ultimate 205x60mm Trunnion Mount Rear Shock** is a high-performance, precision-engineered suspension component designed to elevate the capabilities of modern mountain bikes, enduro rigs, and aggressive trail bikes. Part of RockShox s elite *Ultimate* line, this shock delivers an unparalleled blend of durability, responsiveness, and customization, making it a standout choice for riders who demand both reliability and cutting-edge technology. Built with a **205mm stroke length**, this shock is engineered to absorb the most demanding impacts from deep rock gardens and aggressive descents to high-speed jumps while maintaining exceptional rebound control and energy return. The **60mm diameter** of the piston ensures robust sealing and consistent performance, even under extreme conditions, where heat buildup and pressure fluctuations can compromise lesser shocks.

At the heart of the Deluxe Ultimate is RockShox s **trunnion mount system**, a design innovation that enhances stability and reduces flex in the rear triangle of the bike. This mounting configuration minimizes unwanted movement, allowing the shock to work in harmony with the frame rather than against it, resulting in a more predictable and efficient ride. The **Deluxe Ultimate** also features RockShox s **Dual Path Air (DPA) technology**, which provides a seamless transition between compression and rebound phases, ensuring smooth, progressive damping throughout the entire travel. This system is complemented by the **20mm air spring**, which allows for precise sag adjustments via RockShox s **Clicker Pro** system, enabling riders to fine-tune their suspension to match their weight, riding style, and terrain preferences.

For those who prioritize performance and longevity, the Deluxe Ultimate is constructed with **high-grade materials**, including a **6061 aluminum body** that resists corrosion and maintains structural integrity even under the most punishing conditions. The shock s **sealed cartridge** houses a **high-performance oil blend** and a **nitrogen-charged gas charge**, which work together to deliver consistent damping performance across a wide range of temperatures. The **snap-in cartridge design** also makes servicing and maintenance straightforward, allowing riders and mechanics to easily replace worn components without needing specialized tools or extensive downtime.

One of the standout features of the Deluxe Ultimate is its **adjustable rebound damping**, controlled via RockShox s **Rebound Pro** system, which offers **10 distinct settings** to fine-tune the shock s energy return. This level of adjustability is ideal for riders who switch between different terrains or disciplines, as it allows them to dial in the perfect balance between quick rebound for aggressive pedaling and controlled extension for landing jumps. Additionally, the shock includes **RockShox s Clicker Pro compression damping**, which provides **10 click settings** for progressive compression adjustment, ensuring that the shock can handle everything from small bumps to massive drops with equal ease.

The **Deluxe Ultimate s trunnion mount** isn t just about stability it also contributes to a more efficient power transfer, as the shock s pivot point is positioned to minimize frame flex and maximize energy transfer to the wheel. This design is particularly beneficial for riders who prioritize aggressive riding styles, as it reduces the risk of the rear wheel losing traction or the bike bottoming out under heavy loads. The shock s **low-profile design** also ensures compatibility with a wide range of frames, making it a versatile upgrade for both stock and custom builds.

For those who demand the absolute best in suspension technology, the Deluxe Ultimate is backed by RockShox s reputation for innovation and reliability. Whether tackling a technical enduro race, carving through technical singletrack, or pushing the limits on a high-speed descent, this shock is engineered to perform consistently, season after season. Its **durable construction, precise adjustability, and seamless integration** with modern bike frames make it a premium choice for serious riders who refuse to compromise on performance. With the Deluxe Ultimate, RockShox has once again set a new benchmark for rear suspension technology, offering a blend of sophistication, power, and adaptability that few other shocks can match.

The **RockShox Deluxe Ultimate 205x60mm trunnion-mount rear shock** is a high-end, performance-oriented shock designed for aggressive riding, particularly in downhill, freeride, and extreme trail conditions. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Superior Performance in Rough Terrain**

The Deluxe Ultimate is engineered for extreme conditions, featuring a **highly durable and responsive** design that excels in deep ruts, rocks, and aggressive descents. Its **high-speed compression damping** and **adjustable rebound** provide precise control, making it ideal for riders who demand maximum performance in technical terrain.

2. **Advanced Trunnion Mount Design**

The **trunnion-mount system** (instead of a traditional axle mount) reduces flex, improves pedal-back feel, and enhances energy transfer, which is crucial for aggressive riding. This design also allows for better wheel alignment and reduces stress on the frame and fork.

3. **Adjustable Damping for Customization**

The shock offers **fine-tuned adjustability** for both **compression (high-speed and low-speed)** and **rebound**, allowing riders to dial in their suspension to match their weight, riding style, and terrain. This level of customization is rare in entry-to-mid-range shocks.

4. **Durable and High-Quality Components**

RockShox uses **premium materials**, including **anodized aluminum** and **high-performance seals**, which contribute to longevity and reliability. The **Deluxe Ultimate** is built to withstand heavy abuse, making it a long-term investment for serious riders.

5. **Compatibility with Modern Bikes**

The **205x60mm trunnion mount** is a relatively new standard, meaning it fits a growing number of high-end bikes, particularly those designed for downhill, enduro, and freeride disciplines. This ensures better integration with the bike s geometry and suspension system.

6. **Better Pedal-Back Feel**

Due to its **stiffer trunnion mount**, the shock provides a more direct and responsive pedal-back sensation compared to traditional axle-mounted shocks. This is particularly beneficial for riders who rely on their rear suspension for aggressive maneuvers.

7. **RockShox s Reputation for Reliability**

RockShox is a trusted brand in the cycling industry, known for **consistent performance, strong customer support, and frequent updates** to their suspension technology. Owning a RockShox shock often comes with access to service centers and parts.

8. **Future-Proofing**

As more bikes adopt trunnion mounts, investing in this shock now may make it easier to upgrade or replace in the future without compatibility issues.

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### **Cons**

1. **High Cost**

The Deluxe Ultimate is **one of the most expensive rear shocks** on the market, often priced significantly higher than alternatives from Fox, Suntour, or even other RockShox models (e.g., the **Deluxe** or **Rezult**). This makes it a **non-starter** for casual or budget-conscious riders.

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

If you primarily ride **trail, cross-country, or light enduro**, the Deluxe Ultimate s **aggressive tuning and stiff platform** may feel too harsh or unresponsive. A **mid-range shock (e.g., Fox DHX2, RockShox Deluxe)** would likely be more versatile and cost-effective.

3. **Weight**

Like most high-performance shocks, the Deluxe Ultimate is **heavier** than budget options. While the weight difference may not be noticeable on the trail, it adds to the overall bike weight, which could be a consideration for riders who prioritize efficiency.

4. **Complexity for Beginners**

The **extensive adjustability** can be overwhelming for new riders who may not fully understand how to tune their suspension. Poor tuning can lead to **poor performance, premature wear, or even damage** if settings are not optimized.

5. **Limited Availability of Parts**

While RockShox has a strong service network, **high-end shocks like this one may have longer wait times for repairs or replacements** compared to more common models. This could be a drawback in remote areas or if the shock fails unexpectedly.

6. **Potential for Over-Tuning**

Some riders may **over-adjust** the shock, leading to a **stiff, unyielding ride** that feels more like a rigid setup than a suspension bike. Proper tuning requires experience or professional help, which adds to the cost.

7. **Not Ideal for All Frame Types**

While trunnion mounts are becoming more common, **not all bikes** (especially older or budget models) are compatible. If your bike doesn t support trunnion mounts, you ll need to either **upgrade your frame** or stick with an axle-mounted shock.

8. **Maintenance Requirements**

High-performance shocks **require more frequent maintenance** (e.g., seal checks, fluid changes, damping adjustments) than basic shocks. Neglecting maintenance can lead to **reduced performance and premature failure**.

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### **Conclusion**

The **RockShox Deluxe Ultimate 205x60mm trunnion-mount rear shock** is a **top-tier suspension component** designed for **aggressive, high-performance riding**. It excels in **downhill, freeride, and extreme trail conditions** where **precision, durability, and responsiveness** are critical. Its **trunnion mount, advanced damping, and high-quality build** make it a **premium choice** for serious riders who demand the best.

However, it is **not a practical or cost-effective option** for:

- Casual riders or those on a budget.

- Riders who mostly tackle **mild trails, enduro, or cross-country**.

- Those who lack the **experience or willingness to tune and maintain** a high-end shock.

- Bikes that **do not support trunnion mounts**.

If you **ride aggressively, prioritize performance, and have the budget**, the Deluxe Ultimate is an **excellent investment**. For most other riders, a **mid-range shock (e.g., Fox DHX2, RockShox Deluxe, or Suntour XCR)** would offer a **better balance of cost, versatility, and performance**.

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### **Recommendation**

**Buy the RockShox Deluxe Ultimate if:**

You ride **downhill, freeride, or extreme trails** regularly.

Your bike is **trunnion-mount compatible** (check with the manufacturer).

You are **willing to invest in high-performance suspension** and understand its tuning.

You prioritize **durability, responsiveness, and precision** over cost savings.

You have **experience with suspension tuning** or are prepared to work with a professional.

**Avoid the RockShox Deluxe Ultimate if:**

You ride mostly **trail, enduro, or cross-country** and don t need extreme performance.

Your bike **does not support trunnion mounts**.

You are **new to suspension tuning** and cannot properly adjust the shock.

You are **on a tight budget** and can find a **similarly performing shock at a lower cost** (e.g., Fox DHX2, Suntour XCR).

**Alternative Recommendations:**

- **For aggressive riders on a budget:** **Fox DHX2** (trunnion mount available) or **RockShox Deluxe** (axle mount).

- **For enduro/trail riders:** **Fox DHX2, Suntour XCR, or RockShox Deluxe** (better versatility).

- **For maximum performance (if budget is no issue):** **Fox Factory DHX2** (often considered the best in class).

If you **must have the best**, the Deluxe Ultimate is a **fantastic choice**. Otherwise, **prioritize your riding style and budget** before making a decision.

Details:

RockShox Super Deluxe Ultimate 205x60mm Trunnion Mount Rear Shock. Approximately 8 hrs on it since full rebuild and in perfect working order.

part #: 18t20837519 prices

  • $234.86-$498.75

specifications ribicycl:

  • brand: Rockshox
  • mpn: 18t20837519
  • part type: Mount
  • shock type: Air Shock
  • eye to eye measurement: 205 Mm
  • color: Black, White, Yellow
  • compatible bike type: Mountain Bike
  • set includes: Rear Shock
  • material: Aluminum
  • stroke length: 60 Mm

general ribicycl:

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

seller ribicycl:

  • city: Asheville, North Carolina
  • # reviews: 36
  • rating: 0.0%

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  • policy: No Returns

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  • type: Calculated
  • class: Standard
  • cost: $14.00
  • transit: 5-11 Days
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offer ribicycl:

  • quantity: 1
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  • started: March 8, 2026
  • availability: In Stock
  • sold: 0
part type: mount, shock type: air shock, eye to eye measurement: 205 mm, compatible bike type: mountain bike, set includes: rear shock, stroke length: 60 mm,
category: sporting goods > cycling > bicycle components parts > rear shocks, color: black white yellow, material: aluminum, sku: 17027407232530723,
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