For frame builders who demand uncompromising quality and timeless reliability, our BSA Threaded Titanium Bottom Bracket Shell (68mm) represents the pinnacle of precision engineering. CNC-machined from aerospace-grade Grade 5 titanium, this shell combines the universal compatibility of the BSA English thread standard with the exceptional strength-to-weight ratio of titanium. Whether you’re crafting custom road frames, restoring classic bicycles, or producing high-performance builds, this component delivers lasting durability and clean aesthetics.
Material Excellence: Aerospace-Grade Grade 5 Titanium
Constructed from Grade 5 (Ti-6Al-4V) titanium, the industry-preferred alloy for premium 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 and medical applications where failure is not an option.
- Natural Corrosion Resistance: Ensures smooth threading and reliable performance for decades, even in all-weather conditions.
- Clean Aesthetic: The raw titanium finish complements any frame style, from classic to modern.
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 |
| 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 | 68.5 mm |
| Outside Diameter | 40.0 mm (±0.05 mm tolerance) |
| Length | Fully Customizable (68.5mm 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 |
Custom Manufacturing: Lengths Tailored to Your Geometry
We understand that frame designers require flexibility to achieve their unique geometry goals. That’s why we offer complete length customization for all our bottom bracket shells:
- Any Length You Specify: 68.5mm is the standard road width, but we can machine any length to match your exact frame specifications.
- Prototype to Production: Order a single shell for a custom build or multiple units for production runs.
- No Minimum Order Quantity (No MOQ): We support builders at every scale—from one-off custom workshops to volume manufacturers.
- Rapid Turnaround: In-stock material allows for quick fulfillment of custom orders.
Why Partner With Us for Your Titanium Frame Components?
- Material Integrity: Sourced from certified Grade 5 titanium with full traceability and mill test reports available.
- BSA Thread Expertise: Precision-cut threads ensure smooth cup installation and prevent cross-threading.
- Tolerance Control: Critical interfaces held to ±0.05 mm for perfect alignment and welding preparation.
- Builder-Friendly Design: Proper wall thickness for stable welding and post-weld finishing.
- Flexible Ordering: No MOQ means you maintain lean inventory while having access to quality components.
Applications:
- Custom Titanium Road Frames
- Touring and Endurance Bikes
- Fixed-Gear and Track Frames
- Frame Restoration Projects
- Production Runs for Independent Brands
- High-Performance Upgrades
Important Fabrication Note:
This bottom bracket shell is designed for professional frame builders with experience in titanium welding and alignment. Post-weld facing and tapping verification are recommended to achieve final dimensions and ensure perfect cup installation.
