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  3. DIA COMPE 33000817007

DIA-COMPE 33000817007 Aheadset Threadless Mtb Road Bike Diacompe 1/8 EC34/28.6 Spacers

33000817007 Dia-compe Vintage Aheadset 1 1/8 Inch Threadless - Ec34/28.6 Ec34 Mtb Road Bike With Spacers

( Brand: Dia-compe ), ( Manufacturer Part Number: 33000817007 ), ( Part Type: Bike ), ( Headset Type: Headsets ), ( Defined Color: Black ), ( S.h.i.s Lower: Ec34 ), ( Item Diameter: 1 1/8 ), ( Set Includes: Headset ), ( Item Length: 3.710 ), ( Steerer Tube Diameter: 1 1/8 In ), ( Item Height: 2.030 ), ( Compatible Bike Type: Universal, Mountain Bike, Road Bike ), ( Country Of Origin: Taiwan )

Review DIA COMPE Vintage Aheadset 1/8 Inch Threadless Ec34/28.6 Mtb Road Bike Spacers

The **Dia-Compe 33000817007 Ahead-Set Spacer** is a precision-engineered, high-performance component designed to elevate the functionality and adjustability of your EC34 or EC28.6 crankset, ensuring seamless compatibility with a 1/8-inch threadless bottom bracket shell. These spacers are meticulously crafted from durable, lightweight aluminum, offering a robust yet minimalist solution for fine-tuning crankarm alignment, chainline, and overall drivetrain efficiency. Ideal for mountain bikers and road cyclists alike, the EC34/EC28.6 series spacers are engineered to accommodate the unique spacing requirements of Shimano s Hollowtech II and Hollowtech II XS bottom brackets, providing a snug fit that minimizes wobble and maximizes power transfer. Whether you're fine-tuning a new build, addressing wear from extended use, or adjusting for a custom fit, these spacers deliver the precision needed to optimize pedal stroke consistency and drivetrain performance. Their compact yet sturdy design ensures they integrate seamlessly into your existing setup, allowing for quick and easy installation without compromising the structural integrity of your bike s drivetrain. Perfect for riders seeking a balance between customization and reliability, these spacers are a testament to Dia-Compe s commitment to delivering components that enhance both performance and longevity.

### **Pros and Cons of buying a Dia-Compe 33000817007 Aheadset (1/8" Threadless, EC34/28.6 MTB/Road Bike Spacers)**

#### **Pros:**

1. **Compatibility with Multiple Bike Types** The EC34/28.6 standard ensures it fits a wide range of modern road and mountain bikes, particularly those using 1x drivetrains or compact cranksets.

2. **Threadless Design** The 1/8" threadless interface is a common standard, making it easier to install and replace compared to older splined or threaded systems.

3. **Adjustable Spacing** The aheadset allows fine-tuning of chainline and derailleur alignment, which can improve shifting performance and chain wear.

4. **Durability** Dia-Compe is a reputable brand known for producing high-quality, long-lasting components, especially in bottom brackets and cranksets.

5. **Compatibility with Aftermarket Cranks** Works well with popular aftermarket cranks (e.g., Sunrace, Shimano, SRAM) that use the EC34/28.6 standard.

6. **Easy Installation** Threadless design means no special tools are required for installation or removal, unlike some splined systems.

7. **Reduces Chainline Issues** Helps correct misaligned derailleurs, improving shifting consistency, especially in 1x setups where chainline precision matters.

#### **Cons:**

1. **Limited to Specific Bike Models** While EC34/28.6 is common, not all bikes use this standard (e.g., older bikes or some hybrid/e-bikes may require different spacers).

2. **Potential Overkill for Basic Setups** If your bike already has perfect chainline, these spacers may not be necessary unless you re troubleshooting shifting issues.

3. **Cost** Compared to generic spacers, Dia-Compe aheadsets are more expensive, which may not justify the purchase if you only need basic adjustments.

4. **Installation Precision Required** Incorrect spacing can worsen shifting problems if not measured properly. A dial caliper or chainline gauge is helpful.

5. **Not Universal** Some newer bikes (especially with ultra-compact cranks or e-bike setups) may require custom spacers or different standards (e.g., EC34.5).

6. **Warranty Considerations** If your bike is under warranty, improperly installed spacers could void coverage if they affect drivetrain performance.

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### **Conclusion**

The **Dia-Compe 33000817007 aheadset** is a **high-quality, versatile solution** for adjusting chainline on EC34/28.6-compatible road and MTB bikes, particularly those with 1x drivetrains or shifting issues. Its **threadless design, durability, and compatibility** make it a strong choice for riders who need precise derailleur alignment. However, it may be **overkill for bikes with perfect chainline** or those requiring non-standard spacers.

If you re experiencing **poor shifting, chain rub, or derailleur misalignment**, these spacers can be a **worthwhile investment**. But if you re unsure about your bike s exact requirements, **consult a bike mechanic or use a chainline gauge** before purchasing.

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### **Recommendation**

**Buy if:**

- You have an **EC34/28.6 crankset** (common in 1x road/MTB bikes).

- You re troubleshooting **shifting problems or chainline issues**.

- You want a **reliable, high-quality spacer** from a trusted brand.

**Skip if:**

- Your bike already has **perfect chainline** and no shifting issues.

- You re unsure whether your crankset uses the **EC34/28.6 standard** (check compatibility first).

- You re on a tight budget and can use **cheaper generic spacers** instead.

**Best Practice:**

- **Measure your current chainline** before purchasing.

- **Test adjustments incrementally** (start with minimal spacing changes).

- If unsure, **consult a bike shop** to verify compatibility and installation.

For most riders with **1x drivetrains or shifting concerns**, this aheadset is a **solid, long-term solution**. However, always ensure it matches your specific crankset before buying.

Details:

Bearings spin smooth and comes with headset cap as shown. Excellent condition, comes as pictured. #6.44 Could use a good cleaning but races are in shape and so the bearings.

specifications ribicycl:

  • brand: Dia-compe
  • mpn: 33000817007
  • part type: Bike
  • headset type: Headsets
  • defined color: Black
  • s.h.i.s lower: Ec34
  • item diameter: 1 1/8
  • set includes: Headset
  • item length: 3.710
  • steerer tube diameter: 1 1/8 In
  • item height: 2.030
  • compatible bike type: Universal, Mountain Bike, Road Bike
  • country of origin: Taiwan
color: black item Diameter: 1/1 8 mpn: 33000817007 set includes: headset item length: 3.710 steerer tube Diameter: 1/1 8 in brand: Dia-compe item height: 2.030 compatible bike type: universal mountain bike road bike item width: 2.030 part type: headset country of origin: taiwan mpn: 33000817007 set includes: headset item length: 3.710 steerer tube Diameter: 1/1 8 in brand: Dia-compe item height: 2.030 compatible bike type: universal mountain bike road bike item width: 2.030 part type: headset country of origin: taiwan

general ribicycl:

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

returns ribicycl:

  • policy: No Returns

shipping ribicycl:

  • transit: 3-8 Days
  • type: Fixed
  • cost: $0.00
  • service: Expedited
  • class: Expedited

seller ribicycl:

  • rating: 100.0%
  • city: Salt Lake City, Utah
  • # reviews: 4838

offer ribicycl:

  • options: Ship-to-home
  • quantity: 1
  • sold: 0
  • started: April 8, 2026
  • availability: In Stock

payments ribicycl:

  • wallet: Paypal
  • credit card: Discover
  • other
part type: bike, headset type: headsets, defined color: black, s.h.i.s lower: ec34, item diameter: 1 1/8, set includes: headset, item length: 3.710, steerer tube diameter: 1 1/8 in, item height: 2.030, compatible bike type: universal, mountain bike, road bike, country of origin: taiwan,
category: sporting goods > cycling > bicycle components parts > headsets, color: black, sku: 17455618160678772,
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