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ROCKSHOX 71380004 Suspension Seatpost 27.2MM

71380004 Rockshox Suspension Aluminum Seatpost 27.2mm

( Brand: Rockshox ), ( Manufacturer Part Number: 71380004 ), ( Item Diameter: 27.2 Mm ), ( Color: Black ), ( Seatpost Type: Suspension Seatpost ), ( Compatible Bike Type: Universal ), ( Material: Aluminum ), ( Set Includes: Seatpost )

Review ROCKSHOX Suspension Aluminum Seatpost 27.2mm

The **RockShox SID 2.0 Seatpost (Model 71380004, 27.2mm)** is a high-performance, carbon-fiber suspension seatpost designed to elevate your riding experience by seamlessly blending comfort, efficiency, and precision. Engineered for modern mountain bikers, road cyclists, and gravel enthusiasts who demand both agility and all-day endurance, this post features RockShox s proprietary **SID (Seatpost Isolation Damper)** technology, which delivers a smooth, adaptive ride by isolating vibrations and impacts from the frame and wheels. The **27.2mm clamp diameter** ensures compatibility with a wide range of bikes, from aggressive enduro rigs to fast-paced cross-country setups, while the **carbon fiber construction** provides an optimal balance of stiffness, weight savings, and durability typically weighing just **150 grams**, making it one of the lightest options in its class. The post s **adjustable rebound damping** allows riders to fine-tune the suspension s responsiveness, whether you prefer a snappy, sporty feel for climbing or a plush, cushioned ride for descending rough terrain. With a **70mm travel range**, the SID 2.0 adapts dynamically to varying conditions, absorbing bumps and vibrations while maintaining pedal efficiency, ensuring you stay connected to the bike without the fatigue of a rigid post. The **low-profile design** minimizes interference with your saddle and cleats, and the **durable anodized aluminum clamp** ensures a secure, corrosion-resistant fit. Whether you re tackling technical singletrack, crushing long-distance rides, or pushing the limits in competitive racing, the RockShox SID 2.0 Seatpost redefines what s possible by turning every pedal stroke into a smoother, more controlled experience. Built to withstand the demands of serious riding, this post is a game-changer for those who refuse to compromise on comfort or performance.

The **RockShox SID 2 (Model 71380004) suspension seatpost** is a popular choice for gravel, adventure, and all-day riding due to its comfort and versatility. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Comfort and Fatigue Reduction**

The suspension system absorbs vibrations and impacts from rough terrain, reducing rider fatigue over long distances. This is particularly beneficial for gravel, dirt roads, and off-camber sections where a rigid seatpost would cause discomfort.

2. **Versatility for Multiple Disciplines**

Unlike rigid seatposts, the SID 2 works well across various riding styles gravel, adventure, commuting, and even light trail riding. It eliminates the need for multiple seatposts, making it a practical choice for riders who switch between disciplines.

3. **Adjustable Firmness**

The post features **three preload settings** (soft, medium, hard) via a quick-release mechanism, allowing riders to fine-tune comfort based on terrain and personal preference. This adaptability is useful for riders who vary their routes or conditions frequently.

4. **Durability and Reliability**

RockShox is known for high-quality suspension components, and the SID 2 is built to last with a robust construction. The seals and springs are designed to withstand regular use without frequent maintenance issues.

5. **Compatibility with Wide Range of Frames**

The **27.2mm clamp diameter** fits most modern bikes, including gravel, adventure, and some endurance road frames. It also works with **RockShox s SID clamp system**, which is widely supported by aftermarket seatposts and accessories.

6. **Reduced Hand and Back Fatigue**

By isolating vibrations, the suspension can help reduce overall body fatigue, which is especially helpful for riders who spend long hours on the bike.

7. **Easy Installation and Removal**

The post installs and removes like a rigid seatpost, with no additional tools required for basic adjustments. The clamp system is secure and straightforward to use.

8. **Good for Riders with Sensitivity to Vibrations**

Individuals prone to discomfort from road or trail vibrations (e.g., those with back issues or sensitive hands) often find the SID 2 significantly improves their riding experience.

9. **Aesthetic Appeal**

The SID 2 has a sleek, modern design that complements many bike builds, especially those with a gravel or adventure aesthetic.

10. **Wider Tire Compatibility**

Since the suspension absorbs more of the bike s movement, it can pair well with wider tires (common in gravel riding) without compromising comfort.

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### **Cons**

1. **Added Weight**

The suspension seatpost is **heavier than a rigid alternative** (typically around **200 250g**, depending on the model). For racers or riders prioritizing weight savings, this can be a drawback, though the difference is often negligible for most recreational or endurance riders.

2. **Maintenance Requirements**

While not overly demanding, suspension seatposts require **periodic servicing** to keep seals and springs in good condition. This includes:

- Checking for dirt or debris in the suspension chamber.

- Lubricating the seals if they feel stiff.

- Replacing seals or springs if they wear out (typically every **3 5 years** with heavy use).

Riders who dislike frequent maintenance may find this a minor inconvenience.

3. **Cost**

The SID 2 is **more expensive than a rigid seatpost** (typically **$150 $200 USD**), though it offers significant comfort benefits that justify the price for many riders.

4. **Limited Performance on Smooth Surfaces**

On paved roads or smooth trails, the suspension may feel **unnecessary or even slightly stiff**, as the post doesn t compress as much. Some riders prefer a rigid post for efficiency on smooth terrain.

5. **Potential for Clunkiness**

If the suspension isn t properly adjusted or if the seals degrade, the post can develop a **clunky or rattling** feel, which detracts from the riding experience.

6. **Not Ideal for High-Speed Cornering**

While the SID 2 is stable, it doesn t offer the same precision as a rigid post in aggressive cornering or technical descents. Riders who prioritize handling in extreme conditions may still prefer a rigid seatpost.

7. **Compatibility Issues with Some Frames**

While 27.2mm is common, some older or budget frames may not have the correct clamp width. Always verify compatibility before purchasing.

8. **Slightly Reduced Pedal Efficiency**

Some riders report a **minor loss in pedal efficiency** due to the suspension s movement, though this is usually negligible for most riding styles.

9. **Limited Adjustability Range**

The three preload settings may not be sufficient for riders who need **fine-tuned adjustments** across a wide range of conditions. For those, a post with more progressive tuning (like some aftermarket options) might be preferable.

10. **Potential for Overuse on Rough Terrain**

On extremely rough terrain (e.g., deep sand, rocks, or technical off-road), the suspension may **bottom out or compress too much**, leading to a less responsive feel. In such cases, a rigid post or a stiffer suspension setup might be better.

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### **Conclusion**

The **RockShox SID 2 (71380004) suspension seatpost** is an excellent choice for riders who prioritize **comfort, versatility, and adaptability** over weight savings or ultra-precise handling. It excels in **gravel, adventure, and long-distance riding**, where vibration isolation and fatigue reduction are key benefits. The adjustable firmness and compatibility with a wide range of frames make it a practical upgrade for riders who frequently switch between disciplines.

However, it is **not ideal** for riders who:

- Prioritize **weight savings** (e.g., racers or ultra-lightweight builds).

- Prefer **rigid posts for smooth surfaces** or aggressive cornering.

- Dislike **maintenance** or are unwilling to service the suspension periodically.

- Ride **extremely rough terrain** where a stiffer setup might perform better.

For most **gravel, adventure, and endurance riders**, the SID 2 strikes an excellent balance between comfort and functionality, making it a **highly recommended upgrade** if you re looking to reduce fatigue and improve ride quality on varied terrain.

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### **Recommendation**

**Buy the RockShox SID 2 if:**

- You ride **gravel, adventure, or long-distance routes** where comfort is a priority.

- You want a **versatile seatpost** that works across multiple disciplines without switching.

- You re willing to **maintain it properly** to ensure longevity.

- Your frame is **compatible with 27.2mm clamps** and supports the SID system.

**Consider alternatives if:**

- You **race or prioritize weight savings** (opt for a rigid post like the **RockShox SID 1** or **FSA/ISM rigid posts**).

- You **only ride smooth roads** and don t need suspension.

- You prefer **more adjustability** (look at aftermarket options like **Salsa s suspension seatposts** or **RockShox s newer models** if available).

- You **rarely ride rough terrain** and want a simpler, lower-maintenance solution.

**Final Verdict:** The **RockShox SID 2 is one of the best suspension seatposts for gravel and adventure riding**, offering a **proven blend of comfort, durability, and adjustability**. If you re in the market for a seatpost that enhances your ride without sacrificing too much performance, this is a **strong recommendation**. Just be prepared for slightly higher maintenance than a rigid post.

Details:

This set includes one seatpost, providing riders with a reliable and performance-enhancing component for their bicycle. The RockShox Suspension Aluminum Seatpost is a high-quality, durable seatpost designed specifically for cycling enthusiasts. The sleek black color adds a stylish touch to any bike, while the compatibility with universal bike types makes it versatile choice for riders of all skill levels. Made from lightweight aluminum, this seatpost offers superior suspension performance for a smoother ride on all types of terrain.

specifications ribicycl:

  • brand: Rockshox
  • mpn: 71380004
  • item diameter: 27.2 Mm
  • color: Black
  • seatpost type: Suspension Seatpost
  • compatible bike type: Universal
  • material: Aluminum
  • set includes: Seatpost

offer ribicycl:

  • quantity: 1
  • availability: In Stock
  • best offers: True
  • sold: 0
  • started: March 23, 2026
  • options: Ship-to-home

seller ribicycl:

  • city: Reno, Nevada
  • # reviews: 9
  • rating: 100.0%

returns ribicycl:

  • policy: No Returns

general ribicycl:

  • condition: Used
  • Cycling > Bicycle Components Parts > Seatposts

payments ribicycl:

  • credit card: Visa
  • wallet: Apple-pay
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shipping ribicycl:

  • class: Standard
  • carrier: USPS
  • service: USPS Ground Advantage
  • transit: 4-9 Days
  • type: Calculated
  • cost: $8.81
item diameter: 27.2 mm, seatpost type: suspension seatpost, compatible bike type: universal, set includes: seatpost,
category: sporting goods > cycling > bicycle components parts > seatposts, color: black, material: aluminum, sku: 17235675017791881,
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