CTM U-Joints use a bronze sleeve in place of needle bearings. It is important to keep these sleeves well greased using a needle adapter on a regular grease gun. We greased the joints shown here prior to installation. To date, we have racked up more than 7,000 miles of street and trail use without additional greasing and have had no trouble or noise to speak of. The good folks at Extreme Gear in Rancho Cordova, California, performed this installation for us.