BONTRAGER 567621 Trek Comp Blendr Stem Cycling 31.8 70MM

( Brand: Bontrager ), ( Manufacturer Part Number: 567621 ), ( Model: COMP ), ( Part Type: Stem ), ( Color: Black ), ( Stem Type: Threadless ), ( Material: Aluminum ), ( Item Length: 70 Mm ), ( Steerer Tube Diameter: 1 1/8 In ), ( Clamp Diameter: 31.8 Mm ), ( Compatible Bike Type: Road Bike, Mountain Bike, Cyclocross Bike, Electric Bike, Fat Bike, Gravel Bike, Hardtail Bike, Hybrid Bike, Racing Bike )

Review BONTRAGER Trek Comp Blendr Stem 31.8 70mm Degree Black Cycling Used

The **Bontrager Trek Comp Blendr Stem 31.8" (70mm)** is a meticulously engineered, high-performance handlebar stem designed specifically for mountain bikers who demand both precision and versatility on the trail. Crafted from a proprietary **Blendr composite material**, this stem combines the lightweight strength of carbon fiber with the durability of reinforced polymers, delivering an optimal balance of stiffness and shock absorption to enhance ride feel and control. The **70mm rise** provides a natural, ergonomic reach that promotes an upright, comfortable riding position, reducing strain on the wrists and shoulders while maintaining responsiveness ideal for aggressive descents, technical climbs, or all-day endurance rides. At **31.8 inches in length**, the stem accommodates a wide range of fork offsets and headset setups, ensuring compatibility with most modern hardtail and full-suspension mountain bikes, including those with 1x, 2x, or triple drivetrains. The **threaded top cap** allows for easy adjustment of bar rotation and alignment, while the **integrated brake mount** (with a 22.2mm clamp) ensures secure and repeatable positioning for disc brake systems, minimizing lever reach and improving modulation. Engineered with Bontrager s signature **Comp line** philosophy, this stem features subtle, aerodynamic contours that reduce wind resistance without sacrificing structural integrity, making it a standout choice for riders who prioritize both performance and aesthetics. Whether tackling fire roads, singletrack, or enduro laps, the Trek Comp Blendr Stem offers a seamless fusion of innovation and practicality, proving that a well-designed component can elevate the entire riding experience.

The **Bontrager 567621 Trek Comp Blendr Stem (31.8mm, 70mm)** is a popular carbon fiber stem designed for road and gravel cycling, particularly for riders using Trek s Comp and Emonda frames. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Lightweight Construction**

The stem is made from carbon fiber, which significantly reduces weight compared to aluminum or steel stems. This contributes to better handling and efficiency, especially for climbers and time trialists.

2. **Durability and Strength**

Carbon fiber is known for its strength-to-weight ratio, meaning the stem can handle high forces without flexing excessively. It is less prone to bending or breaking under normal riding conditions, though it is not indestructible.

3. **Compatibility with Trek Frames**

This stem is specifically designed for Trek s Comp and Emonda frames, ensuring a precise fit with the stem clamp and headset. The 31.8mm dropouts (common on modern road bikes) and 70mm length provide a balanced reach for these frame geometries.

4. **Smooth Ride Feel**

Carbon fiber absorbs minor vibrations better than metal, providing a slightly smoother ride feel. This can be particularly noticeable on rough pavement or gravel.

5. **Aesthetic Appeal**

The stem has a sleek, modern design with a matte black finish, which many riders appreciate for its clean look. The Bontrager branding adds a touch of premium feel.

6. **Adjustable Reach**

The 70mm length is a standard drop stem length for road bikes, offering a good balance between comfort and aerodynamics. Riders can also adjust the stem s angle slightly by using spacers or a different headset setup if needed.

7. **Compatibility with Drop Bars**

The stem is designed for drop bars, making it suitable for road and gravel bikes where a more aggressive or aerodynamic position is desired.

8. **Warranty and Brand Support**

Bontrager is a reputable brand under Trek s umbrella, offering customer support and warranties. If the stem fails due to a manufacturing defect, it can likely be replaced under warranty.

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### **Cons**

1. **Higher Cost**

Carbon fiber stems are more expensive than aluminum or steel alternatives. For budget-conscious riders, this may be a significant drawback, especially if they are upgrading from a metal stem.

2. **Limited Adjustability**

Unlike some stems with adjustable angles or lengths, this stem is fixed in its 70mm length and 31.8mm dropout compatibility. Riders who need a different reach or angle may need to purchase additional spacers or a different stem.

3. **Potential for Delamination**

While rare, carbon fiber stems can suffer from delamination (layers separating) if subjected to extreme impacts, such as a hard crash or repeated stress from poor maintenance. This is more likely with cheaper carbon stems, but even high-quality ones are not immune.

4. **Not Ideal for Extreme Off-Road Use**

While suitable for gravel riding, this stem is not designed for aggressive off-road use or mountain biking. The carbon fiber may not handle the rougher impacts of trail riding as well as a more robust stem would.

5. **Maintenance Sensitivity**

Carbon fiber stems require careful handling during installation and removal to avoid scratches or damage. Unlike metal stems, they cannot be repaired with welding or soldering if damaged.

6. **Limited Color Options**

The stem is primarily available in a matte black finish. Riders who prefer other colors or finishes may find this limiting.

7. **Weight Sensitivity for Some Riders**

While the lightweight nature is an advantage for most, some riders particularly those prioritizing weight savings in other components may not notice a significant difference from a slightly heavier aluminum stem.

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### **Conclusion**

The **Bontrager 567621 Trek Comp Blendr Stem (31.8mm, 70mm)** is an excellent choice for riders who prioritize weight savings, durability, and a smooth ride feel on road and gravel bikes, particularly those using Trek s Comp or Emonda frames. Its carbon fiber construction offers a significant advantage in terms of performance and aesthetics over metal stems, though at a higher cost. The stem s compatibility with Trek frames and its balanced length make it a practical upgrade for riders looking to enhance their bike s handling without sacrificing comfort.

However, if budget is a concern or if the rider plans to use the bike primarily for extreme off-road conditions, a more affordable or rugged stem might be a better fit. Additionally, riders who require frequent adjustments to their reach or angle may find the stem s fixed design limiting.

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### **Recommendation**

- You own a Trek Comp or Emonda frame and want a lightweight, high-performance stem.

- You prioritize a smooth ride feel and are willing to invest in carbon fiber.

- You ride primarily on road or gravel and do not expect extreme off-road abuse.

- You appreciate the stem s aesthetic and brand reputation.

- You are on a tight budget and can find a similarly performing aluminum stem at a lower cost.

- You need a stem with adjustable length or angle, or one that is more rugged for off-road use.

- You prefer a different finish or color option.

For most road and gravel riders using Trek frames, this stem is a solid and worthwhile upgrade. Its combination of performance, durability, and compatibility makes it a strong recommendation for those who value carbon fiber technology.

Details:

Trek Bontrager Comp Blendr Stem 31.8 70mm 7 degree Black Cycling. Condition: used, but remains in very good overall condition as pictured.

part #: 567621 prices

• $85.99-$209.99

specifications ribicycl:

• brand: Bontrager
• mpn: 567621
• model: Comp
• part type: Stem
• color: Black
• stem type: Threadless
• material: Aluminum
• item length: 70 Mm
• steerer tube diameter: 1 1/8 In
• clamp diameter: 31.8 Mm
• compatible bike type: Road Bike, Mountain Bike, Cyclocross Bike, Electric Bike, Fat Bike, Gravel Bike, Hardtail Bike, Hybrid Bike, Racing Bike

payments ribicycl:

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

shipping ribicycl:

• service: USPS Ground Advantage
• carrier: USPS
• transit: 4-7 Days
• cost: $5.45
• class: Standard
• type: Calculated

returns ribicycl:

• policy: No Returns

general ribicycl:

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

seller ribicycl:

• rating: 99.3%
• city: Louisville, Colorado
• # reviews: 1768

offer ribicycl:

• availability: In Stock
• best offers: True
• quantity: 1
• started: February 7, 2026
• sold: 0
• options: Ship-to-home

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