Compatible with ALL Shimano 9/10/11 speed rear derailleurs
Compatible with ALL Sram 9 speed MTB rear derailleurs
Compatible with ALL Sram 10 speed ROAD rear derailleurs
 
If your looking for all the extra edge you can get, these are for you. These high quality rear derailleur pulleys are an excellent upgrade to all factory brand rear derailleurs. Significantly reduce drivetrain friction by up to 60% with these high quality ceramic ball bearings.
 
PRODUCT FEATURES:
Smooth & precise shifting
Quiet Running Drivetrain
Cogs CNC Machined from 7075 Aluminum Alloy
Weight: 8.6 grams each
 
BEARING FEATURES:
Performance Breakthrough - Speed increases approaching 4%, i.e., over 1 km a rider can gain 20-40m.
Ti Ceramic Bearing Technology,  features proprietary Titanium Nitride coated stainless steel races and cones.
TiN nano-technology surface treatments fill stainless steel pores making the bearing races smoother, harder, and more durable than standard stainless races.
This product is lighter and smoother and will last longer than other ceramic and steel bearings.
High quality Si3N4 ceramic ball bearings
Ti Ceramic bearings are 60% lighter than steel bearings
Ti Ceramic Bearings produce up to 60% less friction
Ti Ceramic Bearings are 15-20% stiffer than steel ones
Ti Ceramic Bearings are resistant to corrosion
Ti Ceramic Bearings have a lifetime 10 times longer than steel bearings
 
BEARING SPECIFICATIONS:
Bearing Race Material: Nano-technology Titanium Nitride coated stainless steel.
Rolling Element Material: Full Ceramic Si3N4 Grade 3
Bearing Grade: ABEC 5
Bearing Density: 3.2g/cm³
Vickers Hardness Index: 1,700-2700 kg/mm²
Enclosure Type: Low Friction Seal both sides
Lubricant: Kluber ISOFLEX NBU 15