Title: Custom BSA Threaded Titanium Bottom Bracket Shell | Grade 5 | BB73 Standard | Length Customizable | No MOQ
Product Overview: The Gold Standard in Threaded Bottom Bracket Engineering
For frame builders who demand timeless reliability and precision, our BSA English Thread Titanium Bottom Bracket Shell sets the benchmark. Precision-machined from aerospace-grade Grade 5 titanium, this shell combines the universal compatibility of the BSA standard with the weight savings and durability of premium titanium. Whether you’re crafting a custom road bike, touring frame, or fixie build, this component delivers dependable performance and lasting quality.
Material Excellence: Aerospace-Grade Grade 5 Titanium
Constructed from Grade 5 (Ti-6Al-4V) titanium, the industry’s preferred alloy for high-performance bicycle frames, our BSA shells offer:
- Superior Strength-to-Weight Ratio: Significantly lighter than steel BSA shells without compromising structural integrity.
- Proven Durability: Ti-6Al-4V is trusted in aerospace, medical, and cycling applications where failure is not an option.
- Natural Corrosion Resistance: Ensures smooth threading and reliable performance for decades, even in all-weather conditions.
- Clean Aesthetics: The raw titanium finish complements any frame style, from classic steel-inspired builds to modern titanium masterpieces.
BSA English Thread Precision
Engineered to the exacting BSA (British Standard Cycle) specification, this shell provides:
- Standard Threading: 1.370″ x 24 TPI (Threads Per Inch) – the most widely adopted bottom bracket standard worldwide.
- Right/Left Hand Threads: Right-hand thread (drive side) and left-hand thread (non-drive side) for secure cup retention.
- Full Thread Engagement: 17mm thread width on each side ensures secure cup installation and reliable performance.
- Universal Compatibility: Fits all BSA-threaded bottom bracket cups and crankset systems (Shimano, SRAM, Campagnolo, and aftermarket).
Precision Dimensions for Professional Results
Every shell is CNC-machined to strict tolerances, ensuring perfect alignment and reliable cup installation.
| Specification | Detail |
|---|---|
| Material | Grade 5 Titanium (Ti-6Al-4V) – Aerospace Grade |
| Model | BB73 |
| Thread Standard | BSA English (1.370″ x 24 TPI) |
| Thread Direction | Right-hand (Drive Side) / Left-hand (Non-Drive Side) |
| Thread Width | 17 mm (Each Side) |
| Standard Length | 73.0 mm |
| Outside Diameter | 40.0 mm (±0.05 mm tolerance) |
| Length | Fully Customizable (73mm standard; any length available) |
| Wall Thickness | Optimized for welding and structural integrity |
| Surface Finish | Raw machined / Brushed / Polished options available |
| Packaging | Individually wrapped to prevent surface damage |
