SUZHOU POLESTAR METAL PRODUCTS CO., LTD
Your One-Stop Precision Metal Fabrication Solution - Cut, Shape, Weld, Assembly
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Advanced Ultra-Precision five-axis CNC-Machined Bicycle Bottom Bracket System
Product Overview:
Crafted through state-of-the-art CNC machining processes, our high-performance bicycle bottom brackets represent the gold standard in drivetrain efficiency and durability. Manufactured in our ISO 9001-certified facility with aerospace-grade precision, these components combine cutting-edge engineering with race-proven reliability to deliver unmatched power transfer across all cycling disciplines. The choice of professional pelotons and performance-focused riders worldwide, each bottom bracket undergoes rigorous quality control to ensure perfect bearing alignment, optimized stiffness-to-weight ratios, and exceptional longevity - whether conquering alpine climbs, technical singletrack, or endurance gravel routes. By integrating premium materials with micron-level machining tolerances, we've created a bottom bracket system that consistently outperforms OEM components while maintaining flawless compatibility with modern frame standards.
Key Technical Features:
Advanced Materials Engineering
Aerospace-grade 7075-T6 aluminum alloy (ultimate tensile strength: 572 MPa)
Optional titanium alloy (Grade 5) for ultra-premium applications
Proprietary heat treatment process enhances fatigue resistance by 40%
Precision CNC Manufacturing
5-axis CNC machining with ±0.01mm tolerance
Micro-finish surface treatment (Ra 0.4μm) for optimal bearing seating
Computer-balanced design eliminates rotational imbalance
Bearing Technology
Japanese-made hybrid ceramic bearings (Si3N4 balls with steel races)
Double-lip contact seals with high-temperature grease
ABEC-7 tolerance rating for smooth operation
Detailed Product Specifications Table
| Model | Type | Materials | Compatible Standards | Bearing Type | Weight | Load Rating | Water Resistance |
| ProRoad SL | Threaded (BSA) | 7075-T6 Al | Shimano HollowTech II, Campy Ultra-Torque | Ceramic Hybrid | 65g | 2000N | IP67 |
| MTB Enduro Pro | Press-Fit BB92 | Titanium | SRAM DUB, 30mm spindle SRAM DUB | Sealed Cartridg | 70g | 2500N | IP68 |
| Gravel Ultimate | T47 | 7075-T6 Al + Steel inserts | All major standards | Angular Contact | 78g | 2200N | IP66 |
| eBike HD | Threaded | Steel reinforced Al | Bosch, Shimano Steps | Industrial Grade | 95g | 3500N | IP69K |
Performance Advantages:
Efficiency Gains
15% lower rolling resistance than OEM bottom brackets
3-5 watt power savings at 90rpm cadence
Break-in period of just 50km (vs 200km for standard BBs)
Durability Features
50,000km rated service life (3x industry average)
Corrosion-resistant anodizing (25μm thickness)
Wear indicators for proactive maintenance
Installation System
Includes proprietary installation tool kit
Torque specification laser-etched on body
Pre-loaded with anti-seize compound
Application Guide:
Road Cycling
Recommended model: ProRoad SL
Benefits: Maximizes power transfer for sprinting/climbing
Compatible with: Carbon fiber and aluminum frames
Mountain Biking
Recommended model: MTB Enduro Pro
Benefits: Mud-shedding design, impact resistance
Compatible with: 29er/27.5" full-suspension bikes
Gravel/Adventure
Recommended model: Gravel Ultimate
Benefits: Vibration damping, all-weather reliability
Compatible with: Frame bags and bikepacking setups
E-Bikes
Recommended model: eBike HD
Benefits: Handles 120Nm motor torque
Compatible with: Class 1-3 e-bike systems
Quality Assurance:
100% dimensional inspection via CMM
Batch testing for bearing smoothness (≤0.5N·m breakaway torque)
Vibration testing to simulate 10,000km of riding
Salt spray testing exceeds 500 hours
Why Consider Us?
No mold fees for aluminum profiles – We absorb these costs to reduce your expenses.
No welding fixture charges – Another way we help you save.
Combing different Producing Technology – Outsource Aluminium Profile, Shaped Metal, Metal Casting materials, MIM materials, then CNC machining to lower the unit price.
Cost-competitive production – Our lean manufacturing and expertise allow us to deliver high-quality parts at favorable prices.
One-Stop Factory – Our ISO9001 IATF16949 Certificated factory provide laser cutting, bending, Stamping, CNC Machining, Sheet Metal Working, welding, Assembling in one factory, ensure stable quality control.
