HONDA 51210-HN1-A40 Front Spindle Hub Rotor Left Right Set

( Manufacturer Part Number: 51210-HN1-A40 ), ( Part Type: Rotor Spindle Hub ), ( Country Of Origin: Japan )

Review HONDA 400ex Front Spindle Hub Rotor Left Right Set fits TRX400EX TRX 1999–2007

The **Honda 51210-HN1-A40** is a high-quality, genuine OEM (Original Equipment Manufacturer) front spindle and rotor set designed specifically for the **1999 2007 Honda TRX400EX (TRX 400EX)**, ensuring perfect fitment and optimal performance for this rugged off-road utility vehicle. This meticulously engineered component set includes a **left and right front spindle assembly**, complete with **rotor hubs**, which are critical for the suspension, braking, and overall handling of the TRX400EX. Crafted from durable, high-grade materials, these spindles feature precision-machined surfaces and reinforced construction to withstand the demands of heavy-duty off-roading, including rough terrain, sharp impacts, and prolonged exposure to harsh environmental conditions. The **rotor hubs** are designed to provide consistent braking power while minimizing wear, thanks to their balanced weight distribution and robust mounting points. Whether you're tackling rocky trails, muddy swamps, or steep inclines, this spindle and rotor set delivers the reliability and durability expected from Honda s legendary engineering. Ideal for both restoration projects and routine maintenance, this genuine part ensures seamless integration with the TRX400EX s suspension system, reducing the risk of premature failure and enhancing overall vehicle performance. With its unmatched compatibility and superior craftsmanship, the **51210-HN1-A40** is an essential upgrade or replacement for any TRX400EX owner seeking long-lasting, high-performance components.

### **Pros and Cons of Buying a Honda 51210-HN1-A40 (1999 2007 TRX400EX Front Spindle Hub/Rotor Set)**

1. **Compatibility and Fitment** This part is specifically designed for the **1999 2007 Honda TRX400EX**, ensuring a perfect fit without modifications. It includes both the **spindle, hub, and rotor**, which are critical components for front-wheel suspension and braking.

2. **Durability** Honda parts are known for their **reliability and longevity**, especially in off-road applications where durability is essential. The spindle and hub are built to withstand rough terrain and heavy loads.

3. **Performance Benefits** A well-maintained front spindle, hub, and rotor set ensures **smooth wheel rotation, proper braking response, and reduced play**, improving overall handling and safety.

4. **Ease of Installation** Since this is an **OEM or high-quality aftermarket part**, it should install similarly to the original components, reducing the need for extensive modifications.

5. **Preventative Maintenance** Replacing worn or damaged parts before they fail can **prevent costly breakdowns**, especially in high-mileage or heavily used ATVs.

6. **Resale Value** Keeping the ATV in good condition with genuine or compatible parts helps maintain its **resale value** if you decide to sell later.

7. **Warranty Coverage** If purchasing from a reputable dealer or aftermarket supplier, some parts may come with a **limited warranty**, providing peace of mind.

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- **Limited aftermarket support** compared to newer ATVs.

- **Harder to find specialized tools or guides** for maintenance.

- **Potential rust or wear** in other components if the ATV has been neglected.

2. **Cost Considerations**

- While Honda parts are reliable, they may be **more expensive** than generic aftermarket alternatives.

- If the ATV has **other failing components**, replacing just the spindle/hub/rotor may not be enough to justify the purchase.

3. **Potential Wear in Related Parts**

- If the **bearings, ball joints, or steering components** are worn, replacing just the spindle/hub/rotor may not fully resolve handling issues.

- A **full front suspension inspection** may be needed before purchasing.

4. **Availability and Lead Times**

- Depending on the supplier, **stock availability** could be limited, leading to **longer wait times** for delivery.

- Some aftermarket sellers may not stock this exact part, requiring special ordering.

5. **Installation Skill Required**

- While not extremely difficult, replacing these components **requires mechanical knowledge** and the right tools (e.g., press tools for bearings, torque wrench).

- Mistakes during installation (e.g., improper torque, misaligned components) can lead to **premature wear or safety hazards**.

6. **Rust and Corrosion Risk**

- Older ATVs exposed to **moisture or off-road conditions** may have **rusted spindles or hubs**, which could affect the new parts if not addressed.

7. **Potential for Counterfeit Parts**

- Buying from **unverified sellers** (especially online) risks receiving **fake or low-quality replicas**, which could fail prematurely.

---

### **Conclusion**

- The ATV is **reliable otherwise** and the parts are needed for **preventative maintenance or replacement of worn components**.

- You **prioritize durability and compatibility** over cost savings.

- You have access to **proper tools and mechanical knowledge** for installation.

- The ATV has **multiple failing systems** (e.g., engine, transmission, suspension), replacing just these parts may not be enough to justify the purchase.

- You re buying from an **untrusted source** with no warranty.

- You lack the **skills or tools** to install them correctly, leading to potential safety risks.

### **Recommendation**

- **Bearings** (for smooth rotation).

- **Steering components** (ball joints, linkages).

- **Brakes** (master cylinder, calipers, brake lines).

If these are worn, address them simultaneously.

2. **Buy from a Reputable Source**

- **Honda Authorized Dealers** (for OEM parts with warranty).

- **Trusted aftermarket suppliers** (e.g., **ATV Parts Pro, ATV Nation, or specialized ATV forums** for verified sellers).

- Avoid **eBay or unknown sellers** unless they have **excellent reviews and return policies**.

3. **Consider a Full Front Suspension Overhaul**

- If the ATV has **high mileage or rough service**, replacing just the spindle/hub/rotor may not be sufficient. A **full front suspension rebuild** (including bushings, bearings, and steering components) could be more cost-effective long-term.

4. **DIY vs. Professional Installation**

- If comfortable with **mechanical work**, installing these parts yourself saves money.

- If unsure, **consult a mechanic** to ensure proper alignment and torque specifications.

5. **Budget for Additional Costs**

- **Lubricants** (grease for bearings).

- **Fasteners** (new bolts/nuts if required).

- **Tools** (if you don t already own them).

### **Final Verdict**

The ATV is otherwise sound.

You re replacing **failed or worn components**.

You buy from a **trusted source** with proper support.

The ATV has **multiple major issues**.

You lack **mechanical skills or tools** for proper installation.

The seller has **no reputation or warranty**.

For most **well-maintained TRX400EX owners**, this is a **solid upgrade** that enhances safety and performance. However, always **prioritize a full inspection** before committing to the purchase.

Details:

2001 Honda TRX400EX Parts: Part Number. The bearings and rotors are in great shape. All the threads and mounting points are nice. Location 2-342026.

There are no cracks, welds, or repairs done to them. 2001 Honda TRX400EX Parts 51210-HN1-A40 condition: Nice Genuine set of front spindles with hubs.

part #: 51210hn1a40 prices

• $89.99-$214.94

specifications mocycfra:

• for models: Trx400ex, Trx
• for makes: Honda
• for years: 1999-2007
• mpn: 51210-hn1-a40
• part type: Rotor Spindle Hub
• country of origin: Japan

offer mocycfra:

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

payments mocycfra:

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

seller mocycfra:

• # reviews: 3422
• city: Oregon City, Oregon
• rating: 100.0%

general mocycfra:

• condition: Used
• Motorcycle Scooter Parts Accessories > Body Frame > Frames Parts

shipping mocycfra:

• carrier: USPS
• class: Expedited
• transit: 4-8 Days
• type: Fixed
• cost: $22.00
• service: USPS Priority Mail

returns mocycfra:

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

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