BKCJ-0452 - Directline 11 tooth, CXD Nitrogen Ceramic Bearing, Machined Delrin Derailleur Pulleys for 12-Speed Shimano Dura-Ace Derailleurs
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BKCJ-0452 - 11-tooth, CXD Nitrogen Ceramic Bearing, Machined Delrin Derailleur Pulleys for 12-Speed Shimano Dura-Ace Derailleurs (RD-R9250 6mm wide, w/5mm bolt-hole)
This pulley wheel set fits the following derailleurs:
- Shimano Dura-Ace - RD-R9250
The following Shimano derailleurs are NOT COMPATIBLE:
- Shimano Ultegra - RD-R8250
- Shimano 105 Di2 - RD-R7150
- Shimano 105 - RD-R7100
The ultimate upgrade pulley. Guaranteed never to corrode.
Precision-machined Delrin Derailleur pulleys featuring CXD Nitrogen Ceramic radial bearings for enhanced shifting performance and longevity. Designed and manufactured for performance, these pulleys feature CN (tight clearance) bearings in the upper pulley to maximize shifting accuracy and C4 (loose clearance) bearings in the lower pulley to allow for chain-line movement.
500 AF Delrin pulley material features high mechanical tensile strength and rigidity, natural lubricity, and high resistance to moisture, caustic chemicals, and UV radiation, making these pulleys highly durable, rigid, and very smooth. Delrin also machines very cleanly and precisely. The inherent lubricative qualities of this Teflon-infused material greatly reduce friction when it interfaces with the bicycle chain. When compared to other pulley materials, 500 AF Delrin with Teflon offers significantly less drag than pulleys machined from aluminum or titanium.
An Enduro Bearings exclusive, our CXD Nitrogen Ceramic bearings combine corrosion-proof, cryogenically treated nitrogen steel races with Silicon Nitride Grade 5 ceramic balls in a proprietary process that results in the ultimate high-performance bearing setup. The deep-groove design raceways allow for maximum-sized Grade 5 Silicon Nitride ceramic balls for increased contact area and improved performance and longevity. 90% fill of Kluber NBU52 grease continues to run smoothly over time and is highly resistant to being washed out. It is engineered to stick to the balls and continually be pulled back into the ball path where it is needed.
The 11-tooth upper and lower pulleys with 5mm bolt-holes are designed as a direct upgrade for 12-speed Shimano Dura-Ace derailleurs.
Enduro Derailleur Pulleys are available in a number of configurations and performance levels, starting with Ceramic-Hybrid, Black-Oxide treated Zero Ceramic as a step up, and CXD Nitrogen Ceramic at the top of the line. All are proudly precision manufactured in the USA.
Weight - 18.08g