6903 BKCoating Ceramic Bearing (17x30x7mm) - The Ultimate MTB Pivot Bearing Upgrade
Engineered specifically for the high-stress environment of full-suspension mountain bike pivots, the 6903 BKCoating Ceramic Bearing is the professional's choice for a stronger, smoother, and more durable ride. Upgrade your frame's core component and feel the difference in every trail section.
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✔Built for High-Load Strength: With its robust 17x30x7mm dimensions, the 6903 bearing features larger ceramic balls and a stronger race profile than similar bearings, giving it a higher load capacity to withstand the intense forces of MTB pivots.
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✔Smoother Suspension Actuation: The ultra-smooth G5 ceramic balls reduce friction in your suspension linkage, allowing for a more responsive and supple feel over rough terrain.
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✔All-Weather Durability: The BKCoating provides an essential layer of anti-corrosion and wear resistance, protecting the most exposed and critical parts of your frame from mud, water, and grit.
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✔Pro-Level Compatibility: The 6903 is a widely used standard in the pivots of many high-end full-suspension frames from major brands like Trek and Specialized.
Specifications
| Item | Specification |
| Inner Diameter (ID) | 17mm |
| Outer Diameter (OD) | 30mm |
| Width | 7mm |
| Model | 6903 |
| Ball Material | Grade 5 (G5) Silicon Nitride (Si3N4) |
| Coating Technology | BKCoating Anti-Corrosion Coating |
MTB Pivot Compatibility Guide
The 6903 is a go-to bearing for high-stress locations, most notably the main pivots on full-suspension mountain bike frames. It is a common OEM and replacement part for many popular models, including certain versions of the Trek Fuel EX and Specialized Stumpjumper. However, as suspension designs evolve yearly, it is absolutely essential to confirm the bearing model number printed on your frame's original hardware before ordering.
Frequently Asked Questions (FAQ)
Q: How strong is a 6903 bearing?
A: The strength of a bearing is often measured by its dynamic load rating. Due to its larger dimensions (30mm OD x 7mm width) compared to other bearings with a 17mm bore, the 6903 can accommodate larger balls and has a more substantial structure. This gives it a higher load rating, making it ideal for high-stress applications like MTB suspension pivots that endure constant impacts and lateral forces.
Q: What is the difference between a 6903 and a 6803 bearing?
A: While both share a 17mm inner diameter, they are not interchangeable. The 6903 (17x30x7mm) is significantly more robust than the 6803 (17x26x5mm). Its larger outer diameter and width make it structurally stronger and better suited for the higher load requirements of main suspension pivots, whereas the 6803 might be used in lower-stress pivots or other applications.
Q: Will this fit my Trek Fuel EX pivot?
A: The 6903 bearing is a specified part for many Trek Fuel EX and Specialized Stumpjumper model years. However, to ensure 100% compatibility with your specific bike, the most reliable method is to check the service manual for your frame's model year or to read the model number directly off the seal of the original bearing you are replacing.
