Enduro Bearings XD15 Direct Line Pulley Wheels for SRAM 12-Speed Road & Gravel Rear Derailleurs Black/Gold

Experience unparalleled drivetrain performance with the Enduro Bearings XD15 Direct Line Pulley Wheels, specifically engineered for SRAM 12-speed road and gravel rear derailleurs. These 12-tooth jockey wheels combine precision-machined Delrin construction with XD-15 Ceramic-Hybrid bearings, delivering exceptional shifting accuracy and durability. Designed to withstand corrosion and harsh conditions, these pulleys offer an upgrade that ensures smooth, consistent operation over time without compromising reliability.

The upper pulley employs CN (tight clearance) bearings to maximize shifting precision, while the lower pulley features C4 (loose clearance) bearings allowing optimal chain-line movement. Constructed from 500 AF Delrin infused with Teflon®, these pulleys provide high tensile strength, natural lubricity, and excellent resistance to moisture, chemicals, and UV exposure. This results in less friction and drag compared to pulleys made from aluminum or titanium, translating into a more efficient and responsive drivetrain.

Enduro’s exclusive XD-15 Ceramic-Hybrid bearings incorporate cryogenically treated nitrogen steel races paired with Grade 3 Silicon Nitride ceramic balls for superior longevity and performance. The deep-groove raceways accommodate larger ceramic balls for increased contact area, reducing wear and enhancing smoothness. Packed with Kluber NBU52 grease that clings to the bearing balls and resists washout, these pulleys maintain peak performance ride after ride. With direct-fit bolt holes (4mm upper, 5mm lower), installation is straightforward for SRAM 12-speed setups.

Manufactured proudly in the USA, Enduro Bearings offers these pulleys as the pinnacle of drivetrain component upgrades. Whether you’re a road racer or gravel enthusiast, the XD15 Direct Line Pulley Wheels provide a reliable, high-performance solution designed to elevate your riding experience.

What It’s Good For

• Enhancing shifting precision and responsiveness in SRAM 12-speed road and gravel derailleurs
• Reducing drivetrain friction and drag for improved pedaling efficiency
• Providing long-lasting durability with corrosion-resistant ceramic-hybrid bearings
• Maintaining smooth chain movement through optimized bearing clearance and material choice
• Offering a direct-fit upgrade compatible with SRAM 12-speed components for easy installation

What It’s NOT Good For

• Compatibility with non-SRAM 12-speed derailleur systems
• Use in single-speed or lower-speed drivetrains without SRAM 12-speed specifications
• Applications requiring pulley wheels with teeth counts other than 12
• Derailleurs with bolt sizes other than 4mm upper and 5mm lower

Frequently Asked Questions

Will these pulleys fit my SRAM 12-speed gravel bike derailleur?
Yes, the XD15 Direct Line Pulley Wheels are designed specifically as a direct replacement for SRAM 12-speed road and gravel rear derailleurs, featuring the correct 4mm upper and 5mm lower bolt holes for easy installation.

How do ceramic-hybrid bearings improve performance compared to standard bearings?
Ceramic-hybrid bearings use silicon nitride ceramic balls which are harder and smoother than steel, reducing friction and wear. Combined with cryogenically treated steel races, they offer enhanced durability, smoother rotation, and longer service life, resulting in a more efficient drivetrain.