HONDA 45120-MG9-870 Front Right Brake Rotor Disc 9.1MM

( Manufacturer Part Number: 45120-MG9-870 ), ( Part Type: Rotor Brake ), ( Vintage Part: Yes ), ( Country Of Origin: United States )

Review HONDA Limited Front Right Brake Rotor Disc 9.1mm fits GOLDWING GL1200 EFI 1984–1987

The **Honda 45120-MG9-870 (84-85-87 GL1200 EFI Goldwing) Front Right Brake Rotor Disc (9.1mm)** is a precision-engineered component designed exclusively for Honda s legendary **GL1200 Goldwing** models produced between **1984 and 1987**, including the early **Electronic Fuel Injection (EFI)** variants. This high-performance brake rotor is crafted from **high-grade cast iron**, ensuring exceptional durability, heat resistance, and consistent braking performance under demanding conditions. With a **9.1mm thickness**, it strikes an optimal balance between structural integrity and weight efficiency, allowing for responsive stopping power without compromising the Goldwing s signature smooth ride. The rotor features a **smooth, machined surface** to minimize brake noise and ensure even pad wear, while its **vented design** promotes superior heat dissipation, reducing the risk of fade during aggressive or prolonged braking. Perfectly compatible with the Goldwing s front brake caliper system, this rotor maintains the bike s original braking feel while offering enhanced longevity compared to standard aftermarket alternatives. Whether restoring a classic Goldwing to factory specifications or upgrading for improved safety, this rotor delivers the reliability and performance expected from Honda s iconic touring motorcycle.

### **Pros and Cons of buying a Honda 45120-MG9-870 (GL1200 Goldwing) Front Right Brake Rotor (9.1mm, 84-85-87 Models)**

1. **OEM Quality and Reliability** Honda parts are known for durability and precision engineering, ensuring consistent braking performance.

2. **Direct Fitment** This rotor is designed specifically for the 1984-85-87 GL1200 Goldwing, guaranteeing compatibility without modifications.

3. **Improved Braking Performance** A fresh rotor can enhance stopping power, especially if the original was worn or warped.

4. **Prevents Further Damage** Replacing a worn rotor avoids potential damage to calipers, pads, or the wheel hub.

5. **Cost-Effective Upgrade** Compared to full brake overhauls, this is a relatively inexpensive way to restore braking efficiency.

6. **Easy Installation** Most mechanics or experienced riders can install it without specialized tools.

7. **Long-Term Savings** Preventing brake failure reduces the risk of costly accidents or further brake system damage.

1. **Age of the Part** The part is from the late '80s, meaning it may not have the latest materials or manufacturing refinements found in newer OEM or aftermarket options.

2. **Potential Wear on Calipers/Pads** If the calipers or pads are also worn, replacing just the rotor may not fully restore braking performance.

3. **Limited Availability** Finding an exact match (especially for older models) can be difficult, requiring sourcing from specialty suppliers or used parts markets.

4. **No Performance Enhancement** Unlike aftermarket rotors (e.g., slotted, drilled, or cross-drilled), this is a stock replacement no braking gains beyond OEM specs.

5. **Possible Rust or Corrosion** If stored improperly, older parts may have surface rust that needs cleaning before installation.

6. **Labor Costs** If not installing yourself, labor fees for a simple rotor replacement can add up, especially if other brake components need attention.

This **Honda 45120-MG9-870 brake rotor** is a solid, reliable choice for restoring proper braking function on your **1984-85-87 GL1200 Goldwing**, especially if the original was worn or damaged. It offers **OEM quality, direct fitment, and cost efficiency**, making it a practical option for basic maintenance. However, if you re looking for **improved braking performance or longevity**, pairing it with new brake pads and calipers (or even aftermarket rotors) would be wise. Additionally, if sourcing is difficult, consider checking for **newer OEM replacements or high-quality aftermarket alternatives** that may offer better materials or warranties.

- **Buy if:** You need a **direct OEM replacement** for a worn rotor, want to avoid brake failure risks, and don t require performance upgrades.

- **Consider alternatives if:** You want **longer-lasting brakes, better heat dissipation, or enhanced stopping power** in which case, look into **aftermarket rotors (e.g., EBC, Hawk) or a full brake service**.

- **Pair with:** New brake pads and a **caliper inspection** to ensure optimal braking performance.

- **Installation:** If comfortable, replace it yourself to save labor costs; otherwise, have a mechanic verify caliper/pad condition during installation.

For most riders, this rotor is a **practical and safe choice**, but if budget allows, upgrading other brake components simultaneously will yield better long-term results.

Details:

HONDA 1985 GL1200L A GOLD WING LIMITED EDITION FRONT WHEEL. YOU'RE VIEWING A FRONT RIGHT BRAKE ROTOR DISC THAT HAS BEEN REMOVED FROM RUNNING ENGINE HONDA 1985 GL1200 EFI GOLDWING LIMITED EDITION WITH 95,384 MILES.

part #: 45120mg9870 prices

• $40.00-$55.00

specifications cyclevintagee:

• for models: Gl1200, Efi, Goldwing
• for makes: Honda
• for years: 1984-1987
• mpn: 45120-mg9-870
• part type: Rotor Brake
• vintage part: Yes
• country of origin: United States

seller cyclevintagee:

• # reviews: 21067
• city: Milwaukee, Wisconsin
• rating: 99.9%

offer cyclevintagee:

• sold: 0
• options: Ship-to-home
• started: March 14, 2026
• quantity: 1
• availability: In Stock

general cyclevintagee:

• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories
• condition: Used

payments cyclevintagee:

• other
• credit card: Mastercard
• wallet: Paypal
• cash

shipping cyclevintagee:

• cost: $14.99
• transit: 5-11 Days
• class: Standard
• carrier: UPS
• service: UPS Ground
• type: Fixed

returns cyclevintagee:

• paid by: Buyer
• time: 30 Days
• policy: Returns Accepted

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