NBR O-rings for bicycle disc brake systems are specially designed sealing components used in the hydraulic pathways of bicycle braking mechanisms. Their primary role is to form a stable and flexible hydraulic seal within brake levers, calipers, master cylinders, and hydraulic hoses. By utilizing high-elasticity nitrile rubber, these O-rings ensure that brake fluid remains fully enclosed under pressure, providing precise braking response and consistent performance during long-term riding.
Key Features
High-Pressure Stability
NBR O-rings maintain elasticity and sealing performance under continuous hydraulic pressure typically ranging from 1–3 MPa in bicycle brake systems. They ensure stable pressure transmission to the brake caliper without loss, even during sudden braking.
Temperature Resistance
The material performs reliably within -30°C to +120°C, allowing it to withstand the heat generated from prolonged braking on downhill routes, as well as low-temperature riding environments in winter.
Oil & Brake Fluid Resistance
Designed to be compatible with:
Mineral oil hydraulic brake systems (Shimano / Magura type)
ISO VG-based lubricants
Anti-corrosion fluids commonly used in bicycle maintenance
This prevents swelling, hardening, or seal failure caused by prolonged contact with brake oils.
Wear-Resistant Surface Design
A smooth yet durable sealing surface minimizes friction with metal and plastic components, reducing wear and extending service life in high-frequency cycling conditions.
Precision Fit
Manufactured by high-precision molds with tolerances controlled within ±0.05mm, ensuring perfect compatibility with various brake lever pistons, caliper pistons, and hose connectors.
Dynamic Sealing Performance
NBR O-rings maintain sealing performance under:
This prevents micro-leakage and supports consistent brake feel.
NBR O-rings create a strong hydraulic barrier within the disc brake system, ensuring that brake fluid pressure is transferred directly to the caliper pistons. This guarantees fast, accurate braking feedback and prevents pressure loss during heavy braking.
They block: Dust
Moisture Small debris
from entering the hydraulic circuit, preventing internal corrosion and ensuring smooth piston movement.
NBR Material Performance
NBR is widely used in hydraulic bicycle brakes for its excellent mechanical strength and compatibility with mineral-based brake oils.
|
Property |
Unit |
Test Method |
Value |
|
Hardness |
Shore A |
ASTM D2240 |
70 ± 5 |
|
Tensile Strength |
MPa |
ASTM D412 |
12–18 |
|
Elongation at Break |
% |
ASTM D412 |
250–400 |
|
Compression Set |
% |
ASTM D395 B |
18–25 (22h / 100°C) |
|
Low Temperature Limit |
°C |
ASTM D2137 |
-30 |
|
Oil Resistance |
- |
ISO 1817 |
Excellent |
Why Choose Us for O-Rings?
1.10,000+ Molds Available – Extensive mold library to meet diverse size and material requirements.
2.No MOQ, Starts from One Piece – Flexible customization from sample testing to bulk production.
3. In-Stock Inventory - Standard sizes in stock, ensuring quick shipment, Fast Global Delivery
Focus on Quality
•Precise inspection, zero-defect quality, ensuring both delivery time and quality.
•Meets the 125/1008H high-temperature aging test requirements of the new energy industry;
•Withstands commercial cleaner (Alcohols, Alkalis, Oils) test requirements.
Packing & Delivery
|
MOQ |
1 pcs |
|
Lead Time |
- In stock: Shipped within 3 days |
|
Port |
China Xiamen |
|
Shipping Methods |
Express (DHL, FedEx, UPS), Air, or Sea |
|
Sample Policy |
Samples available; customer should pay freight cost |
Qualification Certificate
Contact US：
Xiamen Best Seal Imp and Exp Co.,Ltd
Tel: +86-592-5782315
Mob: +8618950159396
Email: yunying2@bestsealhk.com
Add: Unit 522-525, Gaodian Road 6#, Huli District, Xiamen, China
Hot Tags: nbr o-rings for bicycle disc brakes & hydraulic applications, China nbr o-rings for bicycle disc brakes & hydraulic applications suppliers, manufacturers, factory
