TRIUMPH W1040 Qd Rear Brake Drum Sprocket Qualcast 46T

( Manufacturer Part Number: W1040 ), ( Type: Wheel Hub ), ( Machine Type: Dual Sport Motorcycle, Off-road Motorcycle, Street Motorcycle ), ( Color: Black ), ( Material: Cast Iron ), ( Vintage Part: Yes ), ( Placement On Vehicle: Rear Wheel ), ( Country Of Origin: United States )

Review TRIUMPH Vintage Qd Rear Brake Drum Sprocket 46t Qualcast Oem fits T100 T120 TR6

The **Triumph W1040 QD Rear Brake Drum Sprocket (46T Qualcast T100/T120/TR6)** is a precision-engineered component designed specifically for Triumph s iconic Bonneville and Thunderbird models, offering a seamless upgrade for riders seeking enhanced performance and reliability. Crafted from high-grade **Qualcast steel**, this sprocket is forged to exacting standards, ensuring superior durability and resistance to wear, even under the most demanding riding conditions. The **46-tooth configuration** strikes an optimal balance between power delivery and chain longevity, making it an ideal choice for both cruising and spirited riding. The **quick-release (QD) design** simplifies installation and removal, allowing for quick adjustments or replacements without the need for specialized tools, while maintaining a secure fit to prevent slippage during aggressive acceleration or braking. This sprocket is engineered to work flawlessly with the **T100, T120, and TR6 rear brake drum systems**, ensuring compatibility with Triumph s classic yet modernized drivetrain architecture. Whether you're restoring a vintage machine or upgrading a modern Triumph, this sprocket delivers a blend of heritage engineering and contemporary performance, reinforcing the bike s legendary reputation for reliability and thrilling ride quality. Built to withstand the rigors of daily use as well as extended adventures, it exemplifies Triumph s commitment to craftsmanship and rider-centric innovation.

### Pros and Cons of buying a Triumph W1040 QD Rear Brake Drum Sprocket (46T Qualcast T100/T120/TR6)

1. **Compatibility and Fitment** This sprocket is specifically designed for the Triumph W1040 (and related models like the T100, T120, and TR6), ensuring a direct fit without modification. It is a QD (quick detach) style, which allows for easy installation and removal without tools, making maintenance simpler.

2. **Durability and Quality** The Qualcast brand is known for producing high-quality, forged steel sprockets that are resistant to wear and deformation. The 46-tooth design is a common and reliable choice for these motorcycles, offering a good balance between chain wear and performance.

3. **Performance Benefits** A 46T sprocket is often chosen for its ability to reduce chain wear and extend the life of the chain and cassette. It can also provide a slightly smoother power delivery, depending on the front sprocket setup. If paired with the correct front sprocket, it can optimize gearing for better acceleration or top-end speed.

4. **Easy Installation** The QD design eliminates the need for chain whippers, special tools, or chain breakers, making it ideal for riders who prefer quick adjustments or frequent sprocket changes (e.g., for different riding conditions or preferences).

5. **Cost-Effective Upgrade** Compared to full chain and cassette kits, replacing just the sprocket is a budget-friendly way to improve drivetrain longevity or adjust gearing. It s also a straightforward DIY project for most riders.

6. **Aftermarket Support** Qualcast is a well-regarded aftermarket brand with a reputation for reliability, and this sprocket is widely available from Triumph dealers, specialty motorcycle shops, and online retailers.

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1. **Limited Gearing Adjustment** Changing just the rear sprocket has a more pronounced effect on low-end torque than high-end speed. If you re looking to significantly alter the bike s gearing (e.g., for aggressive acceleration or top-speed tuning), you may need to also adjust the front sprocket or cassette. A 46T is a moderate choice, so extreme modifications may require additional changes.

2. **Potential Chain Wear** If the chain or cassette is already worn, replacing just the sprocket may not fully resolve drivetrain issues. A full drivetrain inspection (chain, cassette, and sprocket) is recommended before purchase to avoid premature wear on the new sprocket.

3. **QD Sprocket Limitations** While QD sprockets are convenient, they can sometimes be slightly less precise in alignment compared to bolt-on sprockets. Over time, the QD hub s wear can affect chain alignment, though this is rare with high-quality components like Qualcast.

4. **Compatibility with Stock Components** Ensure that your bike s chain and cassette are compatible with the 46T sprocket. Some riders may need to upgrade the chain or cassette to match the sprocket s tooth count for optimal performance and longevity.

5. **Learning Curve for Installation** Although QD sprockets are easier to install than bolt-on ones, first-time users may still require some practice to ensure proper alignment and tension. Improper installation can lead to chain skipping or premature wear.

6. **Potential Overkill for Mild Use** If you primarily ride lightly (e.g., short commutes or casual cruising), the benefits of a 46T sprocket may not be as noticeable. In such cases, a stock or slightly larger sprocket might suffice without the need for an upgrade.

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The Triumph W1040 QD Rear Brake Drum Sprocket (46T Qualcast) is a practical and high-quality upgrade for riders looking to improve drivetrain longevity, adjust gearing slightly, or simplify maintenance. Its QD design makes installation straightforward, and Qualcast s reputation ensures durability. However, it s not a one-size-fits-all solution riders should consider their riding style, existing drivetrain condition, and desired gearing changes before purchasing.

If your primary goals are reducing chain wear, easing maintenance, or making a modest gearing adjustment, this sprocket is a solid choice. For more aggressive tuning, pairing it with a front sprocket or cassette change would be ideal. Always inspect your chain and cassette for wear before installing a new sprocket to ensure optimal performance.

- **Buy it if:** You want a durable, easy-to-install sprocket to extend chain life, adjust gearing modestly, or simplify maintenance on your Triumph W1040/T100/T120/TR6. It s also a good option if you plan to experiment with different sprocket sizes in the future.

- **Avoid it if:** You re looking for dramatic gearing changes (e.g., for aggressive acceleration or top-speed tuning), as a single sprocket swap may not be sufficient. Also, skip it if your chain or cassette is severely worn, as the benefits won t be fully realized.

- **Pair it with:** A chain and cassette inspection (or replacement if needed), and consider consulting a gearing calculator to determine the optimal front sprocket size for your riding style. If you re unsure, a bike mechanic can help assess your drivetrain s condition and recommend the best setup.

Details:

Overall, this is a solid original restoration core that retains excellent survivor character and would be equally at home on rider, project, or display machine. These original castings are preferred by many restorers due to their factory fit, quality, and period-correct appearance. Please verify casting numbers, spline configuration, and dimensions for your specific application before purchasing. Please see my other listings.

Whats pictured is whats included. The spline area and mounting studs appear intact undamaged. Please view photos and inspect as well. Condition: This original Qualcast brake drum and sprocket remains in honest vintage condition.

More coming soon. Much of the original dark finish remains present, along with expected age-related grease residue, oxidation, and light surface rust in areas. Unlike many modern reproduction units, this is an original UK-cast Qualcast component manufactured for Triumphs quick-detach rear wheel system. Shipping costs are estimates.

I do my best to describe everything accurately, but don't know every single detail for year and model. Original Triumph Quick Detach QD rear brake drum and sprocket assembly featuring the desirable Qualcast W1040 casting. More parts available. I ll gladly combine shipping on multiple orders.

The casting is structurally solid with no visible cracks, major damage, or obvious repairs. DETAILS: Genuine Triumph OEM component, Qualcast W1040 casting number, 46-tooth sprocket, Quick Detach QD hub style, Original British-made casting, Integrated rear brake drum and Accepts standard 530 chain, Not reproduction. Designed for Triumph model's equipped with the factory splinted quick-detach rear wheel hub assembly. This authentic British-made component combines the rear brake drum and 46-tooth sprocket into one heavy-duty factory casting is a great original piece for proper Triumph restoration.

FITS: Believed correct for: 1959-1965 Triumph T100 Tiger Dayton 500cc, 1960-1966 T120 Bonneville 650cc, TR6 Trophy 650cc. Please examine photos for condition and quality.

part #: w1040 prices

• $79.95-$138.84

specifications wheehucyc:

• for models: T100, T120, Tr6
• for makes: Triumph
• mpn: W1040
• type: Wheel Hub
• machine type: Dual Sport Motorcycle, Off-road Motorcycle, Street Motorcycle
• color: Black
• material: Cast Iron
• vintage part: Yes
• placement on vehicle: Rear Wheel
• country of origin: United States

shipping wheehucyc:

• type: Fixed
• carrier: UPS
• class: Economy
• transit: 3-9 Days
• cost: $0.00
• service: UPS Ground Saver

seller wheehucyc:

• city: Powhatan, Virginia
• # reviews: 4385
• rating: 99.6%

general wheehucyc:

• Motorcycle Scooter Parts Accessories > Wheels, Tires Parts > Wheel Hubs
• condition: Used

payments wheehucyc:

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

offer wheehucyc:

• availability: In Stock
• quantity: 1
• best offers: True
• sold: 0
• options: Ship-to-home
• started: June 2, 2026

returns wheehucyc:

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

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