Enduro's XD-15 pulleys sit at the top of its derailleur pulley range, and Enduro guarantees them to last forever against corrosion. Machined Delrin wheels run XD-15 ceramic hybrid bearings, here in a 11-tooth upper and lower set designed as an upgrade for most 11-speed Shimano Dura-Ace (9000 series) and Ultegra (8000 series) rear derailleurs.

Highlights

• XD-15 ceramic hybrid bearings: cryogenically treated nitrogen steel races with Grade 5 silicon nitride balls
• Deep-groove races and a 90% fill of Kluber NBU 52 grease that resists washout
• CN (tight clearance) bearing in the upper pulley for shift accuracy, C4 (loose clearance) in the lower for chainline movement
• 500 AF Delrin with Teflon: less drag than aluminium or titanium pulleys
• 11-tooth upper and lower pulleys with 5mm bolt holes
• Precision manufactured in the USA

XD-15 ceramic hybrid bearings

Exclusive to Enduro, XD-15 bearings combine corrosion-proof, cryogenically treated nitrogen steel races with Grade 5 silicon nitride ceramic balls. Deep-groove raceways take the largest possible balls for more contact area, and a 90% fill of Kluber NBU 52 grease is engineered to cling to the balls and keep being drawn back into the ball path, so it resists washout and runs smoother with time.

Machined 500 AF Delrin

500 AF Delrin has high tensile strength and rigidity, natural lubricity and strong resistance to moisture, caustic chemicals and UV, so the pulleys stay durable, rigid and smooth. Its Teflon content cuts friction where the pulley meets the chain, giving significantly less drag than aluminium or titanium pulleys. Enduro makes its pulleys at three levels (ceramic hybrid, black-oxide Zero ceramic and XD-15 ceramic hybrid at the top), all precision manufactured in the USA.

Compatibility & fit

Designed as an upgrade for most 11-speed Shimano Dura-Ace (9000 series) and Ultegra (8000 series) rear derailleurs. Check your derailleur model, speed and pulley bolt sizes before ordering. Our Marrickville workshop can fit the pulleys and check your derailleur adjustment while it's apart. Fitting is a separate workshop service and isn't included in the price.