PROMAX SP21-SP877316-BK Suspension Seatpost 4711103651193 SP-877 31.6 350MM

( Brand: Promax ), ( Part Type: Suspension ), ( Manufacturer Part Number: SP21-SP877316-BK ), ( Clamp Style: Standard Rails ), ( Color: Black ), ( Diameter: 31.6 ), ( Length: 350 ), ( Material: Aluminum ), ( Offset: Mm ), ( Seatpost Type: Suspension Cav Cc 1236 Clsattr 261 Suspension ), ( Weight: 425 ), ( Alt Mpn 1: St0048 ), ( Average Delivery Time: 2-3 Days ), ( Package Weight: 1.6000 ), ( Package Length: 17.87 ), ( Package Width: 3.11 ), ( Package Height: 2.51 ), ( Warranty: 30 Days ), ( UPC: 711103651193 )

Review PROMAX Suspension Seatpost 31.6 350mm Black

The PROMAX SP21-SP877316-BK SP-877 Suspension Seatpost is a high-performance, adjustable suspension seatpost designed to provide riders with superior comfort and control on their bikes. This seatpost is suitable for frames with a 31.6mm seat tube diameter and a seatpost length of 350mm.

The SP-877 Suspension Seatpost features a robust, 21mm diameter, 6061-T6 aluminum alloy shaft, providing excellent strength and durability. The post is topped with a suspension head that utilizes a high-quality, adjustable hydraulic cartridge, allowing riders to fine-tune the amount of suspension travel to suit their preferences and riding conditions. The suspension system is designed to absorb shocks and vibrations from rough terrain, making it ideal for off-road or gravel cycling.

The seatpost also comes with a convenient external rebound adjustment knob, allowing riders to easily adjust the speed at which the suspension returns to its original position after each compression. The adjustment range is from 5 to 15 clicks, providing a wide range of options for riders to customize their ride.

The post is finished with a sleek, matte black powder coat finish, not only enhancing its appearance but also providing excellent protection against corrosion and wear. The included clamp is CNC-machined from 6061-T6 aluminum, ensuring a secure and reliable connection to the saddle.

Additionally, the SP-877 Suspension Seatpost is designed to be easily installed and adjusted with common tools, making it a great option for riders who want to enhance their bike's performance without the need for professional installation.

In summary, the PROMAX SP21-SP877316-BK SP-877 Suspension Seatpost is a high-quality, adjustable suspension seatpost that is perfect for riders looking to add superior comfort and control to their bike. Its robust construction, adjustable suspension system, and easy installation make it an excellent choice for off-road and gravel cycling enthusiasts.

Pros and Cons of buying a Promax SP-877 Suspension Seatpost (31.6mm, 350mm)

The Promax SP-877 Suspension Seatpost is a 31.6mm diameter, 350mm long seatpost designed to offer suspension functionality for enhanced comfort while cycling. Let's examine its key features, benefits, and drawbacks to help you make an informed decision about purchasing this seatpost.

1. Suspension Technology: The Promax SP-877 Suspension Seatpost uses a spring-loaded suspension mechanism that helps absorb shock and vibration, reducing the impact felt by the rider. This can lead to increased comfort on rough terrain, longer rides, and improved overall cycling experience.

2. Adjustable Height: The seatpost's suspension mechanism allows for height adjustment, enabling riders to fine-tune their saddle position to their preference and riding style. This can lead to improved comfort and efficiency during cycling.

3. Durable Construction: The seatpost features a robust and durable design, with a forged aluminum alloy body and a hardened chromoly steel spring. This can ensure long-lasting performance and reliability, even under heavy use.

4. Affordable Price: Compared to other suspension seatposts in the market, the Promax SP-877 offers an attractive price point, making it a cost-effective option for cyclists seeking suspension comfort without breaking the bank.

1. Complex Installation: The Promax SP-877 Suspension Seatpost may require more time and effort to install compared to a traditional seatpost. The suspension mechanism and adjustment features add complexity to the installation process, which may be a disadvantage for less experienced riders or those who prefer a simpler setup.

2. Weight: At approximately 620g, the Promax SP-877 Suspension Seatpost is heavier than a standard seatpost. This additional weight can negatively impact the overall weight and performance of the bicycle, which may be a concern for competitive or weight-conscious cyclists.

3. Limited Suspension Travel: The suspension travel offered by the Promax SP-877 Suspension Seatpost is relatively limited compared to other suspension seatposts on the market. This may not provide sufficient shock absorption for particularly rough or technical terrain, leading to a less effective riding experience in such conditions.

The Promax SP-877 Suspension Seatpost offers a unique combination of suspension technology, adjustable height, durable construction, and an affordable price. However, its complex installation, added weight, and limited suspension travel may be drawbacks for some cyclists. Ultimately, the decision to purchase the Promax SP-877 Suspension Seatpost depends on your specific needs, preferences, and priorities as a cyclist.

If you are a cyclist seeking enhanced comfort and suspension functionality for your bicycle without breaking the bank, the Promax SP-877 Suspension Seatpost may be an excellent option for you. However, if you prioritize a simpler setup, weight savings, or greater suspension travel, you may want to consider alternative seatpost solutions. Always be sure to carefully consider the pros and cons and consult with a knowledgeable professional if needed before making a purchase.

part # sp21sp877316 prices

• $38.36-$58.79

specifications utvyank:

• brand: Promax
• part type: Suspension
• manufacturer part number: SP21-SP877316-BK
• clamp style: Standard Rails
• color: Black
• diameter: 31.6
• length: 350
• material: Aluminum
• offset: Mm
• seatpost type: Suspension Cav Cc 1236 Clsattr 261 Suspension
• weight: 425
• alt mpn 1: St0048
• average delivery time: 2-3 Days
• package weight: 1.6000
• package length: 17.87
• package width: 3.11
• package height: 2.51
• warranty: 30 Days
• upc: 711103651193

shipping utvyank:

• transit: 3-5 Days
• carrier: FedEx
• type: Calculated
• cost: $0.00
• class: Standard, Expedited, One-day
• service: FedEx Ground / FedEx Home Delivery, FedEx 2Day, FedEx Standard Overnight

offer utvyank:

• started: December 7, 2025
• sold: 0
• options: Ship-to-home
• quantity: 9
• availability: In Stock

seller utvyank:

• rating: 99.4%
• # reviews: 496320

payments utvyank:

• other
• credit card: Diners-club
• wallet: Google-pay

general utvyank:

• Parts Accessories > ATV, Side-by-Side UTV Parts Accessories > Other ATV, Side-by-Side UTV Parts Accessories
• condition: New

returns utvyank:

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

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