1. Bubuka
This manual provides detailed instructions for the installation, operation, and maintenance of your ZOOM Disc Brake Mounting Adapter. These adapters are designed to allow the use of various disc brake caliper and rotor size combinations on your bicycle's A-Pillar or B-Pillar forks. Please read this manual thoroughly before installation to ensure correct setup and safe operation.
2. Émbaran Kasalametan
- Always ensure all bolts are tightened to the manufacturer's recommended torque specifications. Overtightening or undertightening can lead to component failure.
- Incorrect installation of brake components can lead to serious injury or death. If you are unsure about any part of the installation process, consult a professional bicycle mechanic.
- Regularly inspect your brake system, including adapters, calipers, and rotors, for wear, damage, or loose components.
- Ensure the adapter chosen is compatible with your specific fork type (A-Pillar or B-Pillar) and desired rotor size.
3. Eusi Paket
Paket anjeun kedah ngandung barang-barang ieu:
- ZOOM Disc Brake Mounting Adapter (specific type as ordered)
- Mounting Screws (typically 2 per adapter)
Note: The exact contents may vary slightly depending on the specific adapter model purchased.
4. Spésifikasi
| Fitur | Spésifikasi |
|---|---|
| merek | ZOOM (NowAct) |
| Nomer modél | A12A149 |
| Bahan | Aluminum Alloy (typical for brake adapters) |
| Size (Mounting Hole Distance) | 51mm / 74mm (standard IS/PM mounts) |
| Sistem ngerem | Line Pulling Disc Brake (compatible) |
| Komponén cocog | Disc Brake Calipers |
| Asalna | Daratan Cina |
| Kira-kira. Beurat | 0.05 kg |
| Ukuran Paket | 5 x 5 x 5 cm |
5. Setup jeung Instalasi
The correct adapter must be selected based on your bicycle's fork type (A-Pillar or B-Pillar) and the desired disc rotor size. Refer to the diagrams and charts below for compatibility and visual guidance.
5.1 Understanding Fork Types and Rotor Sizes
Bicycle forks typically come in two main mounting standards for disc brakes: A-Pillar (Post Mount) and B-Pillar (International Standard or IS Mount). Adapters convert between these standards and allow for different rotor sizes.

A-Pillar Fork:
- Front wheel 160 rotor
- Front wheel 180 rotor
B-Pillar Fork:
- Front 160 rotor / Rear 140 rotor
- Front 180 rotor / Rear 160 rotor
- Front 203 rotor / Rear 180 rotor
5.2 Adapter Instruction Chart
Use the following chart to determine the correct adapter for your brake caliper series, fork type (Front/Rear), and desired rotor size. F indicates Front, R indicates Rear, PM indicates Post Mount fork.

| Ukuran rotor | DB280/285/460/560/680 | DB450 | DB320/325 | HB870/875/870E | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| F | R | PM | F | R | PM | F | R | PM | F | R | PM | |
| Ø 120 mm | N | B1 | N | N | B2 | A9 | N | B1 | N | N | B1 | N |
| Ø 140 mm | B1 | A1 | N | B2 | A6 | N | A10 | A11 | A1 | A1 | A2 | — |
| Ø 160 mm | A1 | A2 | A5 | A7 | N | N | A11 | A5 | A3 | A2 | A5 | A3 |
| Ø 180 mm | A2 | A5 | A3 | A8 | N | N | A5 | A3 | A4 | A5 | A3 | A4 |
| Ø 203 mm | B3 | B4 | A8 | N | N | N | B4 | A4 | N | B4 | A4 | N |
Catetan: F: Standard front fork, R: Standard rear fork, PM: Post mount fork, N: Not available currently, —: No adapter needed.
5.3 Léngkah-léngkah Instalasi
- Identify Fork Type: Determine if your bicycle has A-Pillar (Post Mount) or B-Pillar (IS Mount) brake mounts.
- Pilih adaptor: Using the Adapter Instruction Chart (Figure 2) and your desired rotor size, select the appropriate ZOOM adapter.
- Position Adapter: Place the adapter onto the fork or frame brake mount. Ensure it is oriented correctly for your front or rear wheel and rotor size.
- Mount Caliper: Attach your disc brake caliper to the adapter using the provided mounting screws.
- Install Rotor: Mount your disc rotor to the wheel hub.
- Align Caliper: Install the wheel into the fork/frame. Align the brake caliper over the rotor, ensuring even spacing on both sides. Tighten the caliper mounting bolts.
- Panyegelan ahir: Securely tighten all mounting screws to the manufacturer's recommended torque specifications.
- Rem tés: Before riding, thoroughly test the brakes to ensure proper function and alignment.
5.4 Kelample Adapters



6. Parentah Operasi
Once correctly installed, the disc brake mounting adapter functions passively as a structural component of your brake system. There are no active operating steps for the adapter itself. Ensure your disc brakes are properly bled and adjusted for optimal performance.
7. Pangropéa
- Inspeksi rutin: Periodically check the adapter for any signs of damage, cracks, or deformation.
- Torsi Baut: Ensure all mounting bolts (adapter to fork/frame, caliper to adapter) remain securely tightened to the recommended torque specifications. Loose bolts can lead to dangerous brake failure.
- beberesih: Keep the adapter clean from dirt, mud, and corrosive substances. Use a mild soap and water solution, then rinse and dry thoroughly. Avoid harsh chemicals that could damage the finish or material.
- Korosi: While made from durable materials, prolonged exposure to harsh elements can cause corrosion. Inspect for any signs of rust or material degradation.
8. Cara ngungkulan
- Brake Rub: If your brake pads are rubbing against the rotor after installation, loosen the caliper mounting bolts slightly, squeeze the brake lever to center the caliper, and then retighten the bolts while holding the lever. If rubbing persists, check for a bent rotor or improper adapter selection.
- Komponén Leupas: If the adapter or caliper feels loose, re-check all mounting bolts and ensure they are tightened to the correct torque.
- Incompatible Fit: If the adapter does not fit your fork or caliper correctly, double-check the adapter model against your fork type and desired rotor size using the provided charts. Ensure you have purchased the correct adapter.
9. Tips pamaké
- This item is specifically designed for use with disc brake calipers to adjust rotor size compatibility.
- When upgrading rotor sizes, always ensure your frame/fork and wheel can accommodate the larger rotor.
- Consider using a thread-locking compound (e.g., Loctite blue) on mounting bolts for added security, especially for critical brake components.
10. Garansi jeung Rojongan
For warranty information or technical support, please refer to the seller's specific policies or contact the point of purchase. Keep your proof of purchase for any warranty claims.





