SPECIALIZED ST161AS Stem Mtb Road Threadless Clamp 1-1/8 31.8MM 60MM /-17

( Brand: Specialized ), ( Manufacturer Part Number: ST161AS ), ( Part Type: Stem Clamp ), ( Color: Black ), ( Stem Type: Threadless ), ( Material: Aluminum ), ( Set Includes: Stem ), ( Item Length: 60 Mm ), ( Steerer Tube Diameter: 1 1/8 In ), ( Clamp Diameter: 31.8 Mm ), ( Compatible Bike Type: Mountain Bike, Road Bike ), ( Country Of Origin: Taiwan ), ( Item Weight: 4.3oz )

Review SPECIALIZED Multi Stem Mtb Road 1-1/8 Inch Threadless 31.8mm Clamp 60mm Reach /-17

The **ST161AS STEM** from **STI (Specialized Thread Interface)** is a high-performance, precision-engineered component designed specifically for mountain bike and road bike setups that demand both durability and adaptability. This **1-1/8" threadless stem** features a **31.8mm clamp diameter**, ensuring a secure and stable connection to a wide range of handlebars, from aggressive MTB bars to sleek road dropper posts. The **60mm length** provides a balanced reach, ideal for riders seeking a responsive yet controlled riding position, whether tackling technical singletrack or cruising on paved roads. The **17-degree steerer tube angle** (indicated by the "-17" designation) is a versatile choice, offering a compromise between stability and agility perfect for riders who prioritize a neutral, all-around geometry without sacrificing too much maneuverability. Crafted from **high-grade aluminum**, this stem is lightweight yet robust, capable of withstanding the rigors of off-road riding while maintaining stiffness for efficient power transfer. The **threadless design** allows for easy installation and adjustment, accommodating various steerer tube diameters, and the **smooth, polished finish** ensures a clean, professional look. Whether paired with a hardtail or full-suspension MTB, a gravel bike, or a lightweight road rig, the ST161AS stem delivers a blend of functionality and performance, making it a reliable choice for riders who demand precision in every pedal stroke.

### **Pros and Cons of buying a ST161AS Stem (MTB Road Hybrid, 1-1/8" Threadless, 31.8mm Clamp, 60mm Reach, -17 Angle)**

1. **Versatile Design** The stem is designed for both mountain biking and road/hybrid use, making it a flexible choice for riders who switch between disciplines or prefer a more upright riding position.

2. **Threadless Interface** The 1-1/8" threadless design is durable, easy to install, and widely compatible with modern handlebars, reducing the risk of stripping or damage compared to quill stems.

3. **Adjustable Reach and Angle** The 60mm reach and -17 backward lean provide a balanced, ergonomic position for comfort and control, suitable for riders who prefer a slightly more aggressive or relaxed setup.

4. **31.8mm Clamp Width** This width accommodates a wide range of handlebars (including flat bars, riser bars, and some drop bars), offering flexibility in handlebar choice.

5. **Durability** Made from aluminum, the stem is lightweight yet strong, capable of handling rough terrain and repeated impacts without excessive wear.

6. **Compatibility with Multiple Bar Types** Works with flat bars (common in MTB and hybrid bikes) and some drop bars (with adapters), expanding its usability.

7. **Easy Installation** Threadless stems are generally simpler to install than quill stems, requiring only a wrench and no special tools for tightening.

8. **Budget-Friendly** Compared to high-end stems, this offers good value for its performance and versatility.

1. **Limited Drop Bar Compatibility** While it may fit some drop bars with adapters, it is not optimized for full drop bar use, which could restrict its appeal to road cyclists who rely on drop bars for aerodynamics and shifting.

2. **Not Specialized for MTB or Road** If you exclusively ride mountain bikes or road bikes, a stem designed specifically for one discipline (e.g., a shorter, more aggressive MTB stem or a longer, aerodynamic road stem) might offer better performance.

3. **Angle Limitations** The -17 backward lean may not suit riders who prefer a more aggressive or forward-leaning position (common in aggressive MTB or time-trial road setups).

4. **Potential Bar Compatibility Issues** Some handlebars, especially wider or narrower ones, may not fit perfectly, requiring adjustments or spacers.

5. **Weight** While aluminum is durable, it is slightly heavier than carbon fiber stems, which are preferred by performance-oriented riders for their weight savings.

6. **Less Aesthetic Appeal** The utilitarian design lacks the sleek, premium look of some high-end stems, which may matter to riders who prioritize appearance.

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The ST161AS stem is an excellent choice for riders who need a **versatile, durable, and budget-friendly** option that bridges the gap between mountain biking and hybrid/road use. Its **threadless design, adjustable reach, and compatibility with multiple bar types** make it practical for casual riders, commuters, or those who occasionally switch between disciplines. However, if you are a **dedicated road cyclist** who relies on drop bars or an **aggressive MTB rider** needing a more specialized setup, you may find a stem tailored to your discipline offers better performance.

For most **hybrid, commuter, or general-purpose riders**, this stem provides a **solid balance of functionality, comfort, and value**, making it a recommended purchase.

---

- You ride a hybrid or MTB bike and occasionally use it for light road/commuter purposes.

- You prefer a flat bar setup and want a stem that is easy to install and durable.

- You are looking for a cost-effective solution without sacrificing quality.

- You want a slightly backward-leaning position for comfort and control.

- You exclusively ride road bikes and need a stem optimized for drop bars.

- You prefer a more aggressive or forward-leaning position (look for stems with shorter reach or positive angles).

- You want a lighter stem (carbon fiber options may be preferable for performance).

- You need a stem with a different clamp width (e.g., 25.4mm for some drop bars).

Details:

Like new but mishandled and vandalized during storage. 60mm Reach and only 121g. Please review all photos and listed measurements carefully. Buyer acknowledges that bicycling and outdoor sports are potentially dangerous activities involving physical risk.

Someone drew an anarchy symbol on it and has scratches from being in the bottom bin. Never been installed and a great size weight for the price. The item shown and described are sold as is.

part #: st161as prices

• $25.00-$42.99

specifications ribicycl:

• brand: Specialized
• mpn: St161as
• part type: Stem Clamp
• color: Black
• stem type: Threadless
• material: Aluminum
• set includes: Stem
• item length: 60 Mm
• steerer tube diameter: 1 1/8 In
• clamp diameter: 31.8 Mm
• compatible bike type: Mountain Bike, Road Bike
• country of origin: Taiwan
• item weight: 4.3oz

payments ribicycl:

• credit card: Visa
• other
• wallet: Apple-pay

seller ribicycl:

• # reviews: 381
• rating: 99.7%
• city: Eugene, Oregon

offer ribicycl:

• started: February 18, 2026
• options: Ship-to-home
• sold: 0
• best offers: True
• availability: In Stock
• quantity: 1

shipping ribicycl:

• class: Standard, Expedited
• service: USPS Ground Advantage, USPS Priority Mail, USPS Priority Mail Flat Rate Envelope, USPS Priority Mail Padded Flat Rate Envelope
• cost: $6.09
• type: Calculated
• carrier: USPS
• transit: 3-8 Days

general ribicycl:

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

returns ribicycl:

• paid by: Buyer
• method: Money back
• policy: Returns Accepted
• time: 30 Days

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