1. Bicycle Rims For Sale
  2. sku: 17412254017891731
  3. DIA COMPE AC500

DIA-COMPE AC500 Aero Brake Calipers Road Bike Recessed Diacompe 80S Recess

Ac500 Dia-compe Aero Brake Calipers 80s Road Bike Short Reach Recessed Black

( Brand: Dia-compe ), ( Manufacturer Part Number: AC500 ), ( Model: DIA-COMPE AC500 ), ( Part Type: Bike Short ), ( Compatible Brand: For Dia-compe ), ( Position: Front Rear ), ( Brake Type: Caliper Brake Side Pull ), ( Color: Silver ), ( Compatible Bike Type: Racing Bike, Road Bike ), ( Material: Aluminum ), ( Set Includes: Brake Set, Caliper ), ( Number Of Items: 1 Pair ), ( Country Of Origin: Japan )

Review DIA COMPE Aero Brake Calipers 80s Road Bike Short Reach Recessed Black

The **Dia-Compe AC500 Aero Brake Calipers** from the 1980s represent a refined and aerodynamic evolution in road bicycle braking technology, designed to deliver superior stopping power while minimizing aerodynamic drag a critical consideration for high-performance racing and endurance riding. These calipers are a hallmark of Dia-Compe s engineering prowess during an era when aerodynamics and mechanical precision were becoming increasingly influential in bicycle design. Crafted with a sleek, recessed mounting system, the AC500 calipers are engineered to nest neatly within the fork blade or frame, reducing wind resistance without compromising the caliper s robust build. The design features a lightweight yet durable aluminum construction, ensuring a balance between stiffness and weight savings, which was particularly valuable in a time when carbon fiber was still emerging as a mainstream material. The brake arms are contoured to optimize airflow, with a distinctive aerodynamic profile that minimizes turbulence while maintaining the rigidity necessary for consistent braking performance across varying road conditions. The AC500 calipers are compatible with Dia-Compe s proprietary brake levers and cables, offering a seamless integration with the brand s hydraulic and mechanical braking systems of the era. Their recessed mounting not only enhances aerodynamics but also protects the calipers from debris and minor impacts, prolonging their lifespan and maintaining reliability over long rides. The brake pads, typically made from high-quality organic or semi-metallic compounds, are designed to provide strong, progressive modulation ideal for the aggressive cornering and high-speed descents characteristic of 1980s road racing. While these calipers were originally intended for road bikes, their robust construction and aerodynamic efficiency make them a sought-after upgrade for modern retro-style builds or enthusiasts seeking a vintage aesthetic combined with functional performance. The Dia-Compe AC500 remains a testament to the brand s commitment to innovation, blending form and function in a way that continues to inspire contemporary bicycle design.

**Pros and Cons of Buying Dia-Compe AC500 Aero Brake Calipers for an 80s Road Bike (Recessed Mount)**

### **Pros**

1. **Performance and Aerodynamics** The AC500 calipers are designed with an aerodynamic profile, reducing drag compared to traditional brake calipers. This can improve speed and efficiency, especially on long rides or in time trials.

2. **High-Quality Materials** Dia-Compe is known for using durable, high-grade materials, including aluminum and stainless steel components, which contribute to longevity and reliability.

3. **Precision Engineering** The calipers feature fine-tuned mechanical adjustments, allowing for better modulation and stopping power. This is particularly useful for road cycling where braking efficiency matters.

4. **Compatibility with Modern Systems** While designed for recessed mounting (common on modern bikes), they can often be adapted or retrofitted to older frames with some modifications, depending on the bike s specific geometry.

5. **Aesthetic Appeal** The sleek, aerodynamic design adds a modern look to an older bike, which may appeal to riders who enjoy blending vintage and contemporary components.

6. **Compatibility with Disc Brake Systems** If you plan to upgrade to disc brakes in the future, these calipers may serve as a transitional step, though they are not true disc brake setups.

7. **Rust Resistance** The materials used in Dia-Compe calipers are generally more resistant to corrosion than some cheaper alternatives, which is beneficial for riders in wet or coastal climates.

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### **Cons**

1. **Compatibility Issues** The recessed mounting design is not standard on most 80s road bikes, which typically use rim brake calipers. Retrofitting may require custom brackets, frame modifications, or significant adjustments, potentially voiding warranty or damaging the frame.

2. **Weight** While aerodynamic, these calipers are often heavier than traditional rim brake calipers, which could slightly reduce handling agility, especially on climbs or technical terrain.

3. **Cost** Dia-Compe components are premium, and the AC500 calipers are no exception. The price may be prohibitive for riders on a tight budget, especially when factoring in potential retrofitting costs.

4. **Limited Availability of Parts** Dia-Compe is no longer a major manufacturer, so finding replacement parts, pads, or service support may be difficult compared to more widely available brands like Shimano or Avid.

5. **Learning Curve** If you re unfamiliar with disc brake systems, adjusting and maintaining these calipers may require additional research or professional help, adding to the hassle.

6. **Potential Overkill for Rim Brakes** Since the bike is from the 80s, it likely relies on rim brakes, which are simpler and more efficient for that era s technology. Upgrading to disc brake-style calipers may not offer a meaningful performance boost for rim braking.

7. **Maintenance Complexity** Disc brake calipers (even recessed ones) require more frequent maintenance, such as rotor alignment, pad replacement, and brake fluid (if hydraulic) checks, compared to rim brakes.

8. **Aesthetic Mismatch** While the calipers look modern, pairing them with an 80s bike may create a visually inconsistent look unless intentional. Some riders prefer a cohesive vintage aesthetic.

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### **Conclusion**

The Dia-Compe AC500 Aero Brake Calipers are an excellent choice if you re looking to enhance aerodynamics and braking performance on a bike that can accommodate them ideally one with recessed mounting or a frame designed for disc brake compatibility. However, for an 80s road bike with traditional rim brake setups, the practical benefits are limited due to compatibility challenges, weight, and the lack of a true disc brake system.

The primary appeal lies in the aerodynamic advantage and premium build quality, but these come at the cost of complexity, potential frame modifications, and higher expense. If your goal is purely aesthetic or you re planning a full disc brake conversion, the calipers could be a worthwhile investment. Otherwise, traditional rim brake calipers (e.g., Shimano or Avid) would be a more practical and cost-effective upgrade for an 80s bike.

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### **Recommendation**

If you re committed to using these calipers:

- **Assess frame compatibility** first. If the bike lacks recessed mounting, consult a frame builder or mechanic about custom brackets or modifications.

- **Consider a hybrid approach** keep rim brakes for everyday use but install the calipers on a spare wheel or a dedicated time-trial bike if you want the aerodynamic benefits without retrofitting.

- **Budget for maintenance** expect to invest in rotor alignment, pad replacements, and potential adjustments to ensure optimal performance.

If you re not willing to deal with retrofitting or the extra weight, **stick with high-quality rim brake calipers** (e.g., Shimano Deore or Avid BB7) for a simpler, more practical upgrade that won t compromise the bike s original functionality.

For most 80s road bikes, the effort and cost of adapting these calipers may not justify the gains, especially since rim brakes remain the most efficient and lightweight option for that era s design.

Details:

Used pulls in nice, presentable shape - need a cleaning and polish, but will come out looking very nice. NO sales/shipping outside the USA. Please see the photos.

part #: ac500 prices

  • $19.50-$25.00

specifications ribicycl:

  • brand: Dia-compe
  • mpn: Ac500
  • model: Dia-compe Ac500
  • part type: Bike Short
  • compatible brand: For Dia-compe
  • position: Front Rear
  • brake type: Caliper Brake Side Pull
  • color: Silver
  • compatible bike type: Racing Bike, Road Bike
  • material: Aluminum
  • set includes: Brake Set, Caliper
  • number of items: 1 Pair
  • country of origin: Japan

payments ribicycl:

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

general ribicycl:

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

shipping ribicycl:

  • service: USPS Ground Advantage
  • type: Calculated
  • carrier: USPS
  • class: Standard
  • cost: $10.00
  • transit: 4-9 Days

offer ribicycl:

  • availability: In Stock
  • options: Ship-to-home
  • quantity: 1
  • best offers: True
  • started: April 5, 2026
  • sold: 0

seller ribicycl:

  • # reviews: 2645
  • city: Miami, Florida
  • rating: 100.0%

returns ribicycl:

  • policy: No Returns
part type: bike short, compatible brand: for dia-compe, position: front rear, brake type: caliper brake side pull, compatible bike type: racing bike, road bike, set includes: brake set, caliper, number of items: 1 pair, country of origin: japan,
category: sporting goods > cycling > bicycle components parts > brakes, color: silver, material: aluminum, sku: 17412254017891731,
Dia-compe AC500 Is Similar To:
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5 offers $19.50–$25.00 USD
  • Used. Offer #1 priced at $25.00 + $0.00 shipping estimate = $25.00* total. With a short reach of approximately 55mm, these side-pull caliper brakes are compatible on bicycles that use TEKTRO or similar type brand components The Dia-Compe AC 500 Brake Caliper set is for front and rear positioning on road bikes, racing bikes, and touring bikes.FREE SHIPPING
  • Used. Offer #2 priced at $19.99 + $10.80 shipping estimate = $30.79* total. Sold as-is.+$10.80 shipping
  • Used. Offer #3 priced at $19.50 + $7.50 shipping estimate = $27.00* total. Could use a good cleaning. Dia Compe front and rear brake calipers.+$7.50 shipping
  • Used. Offer #4 priced at $21.99 + $9.42 shipping estimate = $31.41* total. Normal Reach Aero-Compe Caliper Brakes.+$9.42 shipping
  • Used. Offer #5 priced at $19.99 + $0.00 shipping estimate = $19.99* total. FREE SHIPPING

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