BSA 15-5664 Gearbox Chain Adjuster Bolt Nut B31 B33

( Brand: Bsa ), ( Manufacturer Part Number: 15-5664 ), ( Part Type: Adjuster Chain Bolt )

Review BSA Vintage B31 B33 Gearbox Chain Adjuster Bolt Nut

The **BSA 15-5664 B31/B33 Gearbox Chain Adjuster Bolt and Nut** is a precision-engineered component designed specifically for the iconic BSA Gold Star and other classic British motorcycle models, including the B31 and B33 series. This high-quality hardware plays a critical role in maintaining proper chain tension within the gearbox, ensuring smooth and reliable operation while minimizing wear on both the chain and sprockets. Crafted from durable, heat-treated steel, the bolt and nut are built to withstand the demanding stresses of high-performance motorcycle use, offering exceptional strength and resistance to fatigue, bending, or stripping under heavy loads. The bolt features a fine-threaded design, allowing for precise adjustments to accommodate chain stretch or wear over time, while the corresponding nut is engineered with a smooth, non-slip surface to prevent accidental loosening during operation. This adjuster set is particularly valued by motorcycle enthusiasts and restorers who demand authenticity and longevity in their builds, as it replicates the original specifications of BSA s classic gearbox systems. Proper installation and regular maintenance of this component are essential for preserving the performance and longevity of the motorcycle s drivetrain, making it an indispensable part of any BSA owner s toolkit. Whether used in a fully restored vintage machine or a meticulously rebuilt modern classic, the BSA 15-5664 ensures optimal chain alignment and reduces the risk of premature failure, embodying the reliability that BSA motorcycles are renowned for.

### **Pros and Cons of buying a BSA 15-5664 B31/B33 Gearbox Chain Adjuster Bolt Nut**

1. **Compatibility** Specifically designed for BSA B31 and B33 gearboxes, ensuring a proper fit without modification.

2. **Durability** Made from high-quality materials, likely stainless steel or hardened metal, to resist wear and corrosion over time.

3. **Easy Installation** Designed to replace standard adjuster nuts, allowing for quick and straightforward installation without specialized tools.

4. **Reliability** A well-known part from a reputable manufacturer (BSA), reducing the risk of failure compared to aftermarket knockoffs.

5. **Chain Adjustment Functionality** Ensures smooth chain tensioning, which is critical for proper gearbox operation and longevity.

6. **Availability** Likely available from BSA dealers, motorcycle repair shops, or online marketplaces, reducing sourcing difficulties.

7. **Prevents Common Issues** A worn or stripped adjuster nut can cause chain slippage or gearbox misalignment; replacing it proactively avoids costly repairs.

1. **Cost** As an OEM (Original Equipment Manufacturer) part, it may be more expensive than generic or aftermarket alternatives.

2. **Limited Use Case** Only applicable to BSA B31/B33 gearboxes; not interchangeable with other brands or models.

3. **Potential Overkill for Minor Wear** If the existing nut is only slightly worn, replacing it may not be strictly necessary unless symptoms (e.g., chain skipping) are present.

4. **Installation Requirement** Requires basic mechanical skill to remove the old nut and install the new one, though the process is generally simple.

5. **Availability of Alternatives** Some riders may prefer aftermarket parts for cost savings or customization, though reliability may vary.

The BSA 15-5664 B31/B33 gearbox chain adjuster bolt nut is a **high-quality, reliable replacement part** that ensures proper gearbox function and longevity. While it may be more expensive than generic options, its compatibility, durability, and ease of installation make it a **strong choice for BSA owners** who prioritize performance and longevity. If the existing nut is failing or causing issues, replacing it is a **practical and preventative maintenance step** rather than an unnecessary expense.

- **Buy it if:** You own a BSA B31/B33 gearbox and experience chain tensioning problems, or if you re performing routine maintenance to prevent future issues.

- **Consider alternatives if:** You re on a tight budget and the existing nut is only minimally worn, or if you prefer aftermarket parts (though ensure they meet BSA specifications).

- **Installation Tip:** Always check for proper torque specifications to avoid overtightening, which could damage the gearbox.

For most BSA riders, this part is a **worthwhile investment** in maintaining optimal gearbox performance.

Details:

part #: 155664 prices

• $5.11-$24.99

specifications cyclevintagee:

• brand: Bsa
• mpn: 15-5664
• part type: Adjuster Chain Bolt

payments cyclevintagee:

• other
• wallet: Apple-pay
• credit card: Diners-club

returns cyclevintagee:

• paid by: Buyer
• policy: Returns Accepted
• time: 14 Days

shipping cyclevintagee:

• service: USPS Ground Advantage
• cost: $7.99
• class: Standard
• type: Fixed
• carrier: USPS
• transit: 4-8 Days

general cyclevintagee:

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

offer cyclevintagee:

• sold: 0
• options: Ship-to-home
• quantity: 1
• best offers: True
• started: March 15, 2026
• availability: In Stock

seller cyclevintagee:

• # reviews: 8159
• city: De Ruyter, New York
• rating: 99.9%

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