TRIUMPH BSA 41-6090 Rear Wheel Hub Sprocket Chain B44 TR25W 56 520

( Brand: Triumph Bsa ), ( Manufacturer Part Number: 41-6090 ), ( Part Type: Wheel Hub Sprocket Chain )

Review TRIUMPH BSA B44 Rear Wheel Hub And Sprocket 56 Tooth 520 Chain Part fits B25

The **Triumph BSA 41-6090 B44 B25 TR25W Rear Wheel Hub Sprocket (56/520 Chain)** is a meticulously engineered, high-performance component designed exclusively for Triumph and BSA motorcycles within the classic 650cc twin-cylinder family, including iconic models like the TR25, TR35, TR45, and TR55. Crafted from durable, heat-treated steel, this precision-machined sprocket is built to withstand the relentless demands of high-revving engines and heavy-duty riding, ensuring longevity and reliability even under the most challenging conditions. The **56-tooth design** strikes an optimal balance between acceleration and top-speed efficiency, making it ideal for riders seeking a blend of spirited performance and smooth, controlled power delivery. Compatible with a **520-link chain**, this sprocket integrates seamlessly with the stock or upgraded drivetrains, maintaining proper chain tension and alignment while reducing wear on both the sprocket and the corresponding front chainring. Its robust construction minimizes flex and vibration, enhancing overall drivetrain durability and contributing to a more refined riding experience. Whether used in stock form or as part of a tuned setup, this sprocket exemplifies Triumph s commitment to heritage engineering, delivering both authenticity and performance for enthusiasts who demand nothing less than perfection in their classic machines.

### **Pros and Cons of buying a Triumph BSA 41-6090 B44 B25 TR25W Rear Wheel Hub Sprocket (56/520 Chain)**

1. **Compatibility** This sprocket is designed specifically for the Triumph BSA B44/B25 and TR25W models, ensuring a proper fit without modification. It is engineered to work seamlessly with the 520 (5/8-inch pitch) chain, which is a common standard for these bikes.

2. **Durability** The BSA 41-6090 sprocket is built to withstand the demands of motorcycle use, particularly on classic Triumph models. The steel construction and precise machining suggest it is meant for long-term reliability, reducing the risk of premature wear or failure.

3. **Performance Optimization** The 56-tooth sprocket is likely chosen to provide a balanced gear ratio for the TR25W, which is a lightweight, high-revving bike. A larger sprocket can improve low-end torque and acceleration, making it easier to carry speed or climb hills without excessive strain on the engine.

4. **Ease of Installation** Since this is an OEM or high-quality aftermarket part, it should be straightforward to install, especially if you have basic mechanical skills. The hub is designed to accept standard BSA-style sprockets, and the chain compatibility ensures no additional conversions are needed.

5. **Maintenance Benefits** Using the correct sprocket and chain size reduces unnecessary wear on the drivetrain components. A properly matched sprocket and chain can extend the life of the cassette, chainrings, and even the transmission, saving money in the long run.

6. **Aesthetic and Historical Accuracy** For enthusiasts restoring or maintaining period-correct Triumph models, using an authentic or high-quality replica part like this one preserves the bike s original character and value.

7. **Warranty and Support** If purchased from a reputable supplier (such as a motorcycle parts dealer or manufacturer), this sprocket may come with a warranty or guarantee, offering peace of mind against defects.

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1. **Cost** High-quality or OEM replacement parts can be more expensive than generic aftermarket alternatives. While this sprocket is likely a good investment, the price may be a concern for budget-conscious buyers.

2. **Limited Availability** Depending on the supplier, this specific part may not be as widely stocked as more common motorcycle components. You may need to order it online or from a specialty shop, which could involve shipping delays.

3. **Chain Wear Considerations** If the existing chain is significantly worn, replacing just the sprocket may not be sufficient. A worn chain can damage the new sprocket quickly, so it s wise to replace both the sprocket and chain simultaneously for optimal performance and longevity.

4. **Skill Level Required** While installation is generally straightforward, removing the old sprocket and hub may require some mechanical experience, especially if the bike has not been serviced in a while. Rust or seized components could complicate the process.

5. **Potential for Mismatch** If the sprocket is not an exact OEM replacement, there is a slight risk of compatibility issues, such as improper alignment or chain tension. Always verify measurements and consult the bike s service manual before installation.

6. **Weight** Steel sprockets are heavier than some lightweight alternatives (e.g., aluminum or plastic). While this is unlikely to be a major issue for a bike like the TR25W, it s worth noting if you prioritize minimal weight.

7. **Market Variability** The quality of aftermarket parts can vary significantly by manufacturer. Ensure you are purchasing from a trusted brand or seller to avoid counterfeit or low-grade replicas that could fail prematurely.

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### **Conclusion**

The Triumph BSA 41-6090 B44/B25 TR25W rear wheel hub sprocket (56/520 chain) is a well-suited replacement part for these classic Triumph models. Its compatibility, durability, and performance benefits make it a strong choice for riders looking to maintain or upgrade their bike s drivetrain. However, the cost, potential installation challenges, and the need for complementary maintenance (such as chain replacement) are factors to consider.

If you are restoring a TR25W or addressing drivetrain wear, this sprocket is a reliable investment that will contribute to smoother operation and longevity. For best results, pair it with a new chain and ensure proper installation techniques.

### **Recommendation**

- You need an authentic or high-quality replacement for your Triumph BSA B44/B25 or TR25W.

- You are prepared to replace the chain at the same time to avoid premature wear.

- You have access to basic tools and mechanical knowledge for installation, or are willing to seek professional help.

- You prioritize durability and performance over cost savings.

- You are on a tight budget and can find a lower-cost alternative that meets your needs.

- The bike s drivetrain is severely worn, and a full overhaul (including chainrings, cassette, and hub) is more appropriate.

- You lack confidence in installing the part yourself and cannot access a trusted mechanic.

For most enthusiasts restoring or maintaining these bikes, this sprocket is a worthwhile purchase that enhances reliability and ride quality. Always verify the part s authenticity and compatibility before finalizing the order.

Details:

Rays Brit bits and more .:: Listings By Rage biz. BSA TRIUMPH B44 B25 TR25W REAR WHEEL HUB AND SPROCKET 56 TOOTH 520 CHAIN, PART # 41-6090 CAST IN THE DRUM.

part #: 416090 prices

• $23.99-$65.00

specifications cyclevintagee:

• for models: B25
• for makes: Triumph
• brand: Triumph Bsa
• mpn: 41-6090
• part type: Wheel Hub Sprocket Chain

offer cyclevintagee:

• options: Ship-to-home
• sold: 0
• started: February 3, 2026
• quantity: 1
• availability: In Stock

returns cyclevintagee:

• policy: No Returns

general cyclevintagee:

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

shipping cyclevintagee:

• service: USPS Priority Mail Large Flat Rate Box
• cost: $31.50
• type: Calculated
• carrier: USPS
• class: Expedited
• transit: 4-8 Days

seller cyclevintagee:

• rating: 100.0%
• city: Peck, Idaho
• # reviews: 7451

payments cyclevintagee:

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

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