Review on Stylrtop Aluminum Bearing Derailleur Pulleys by Jamie Kamoso

I use them with a 10 speed SRAM X7 with PC1031 chain, no problem for 230+ miles of riding. Wear is minimal, especially on the top pulley. Don't notice that they are louder than regular ones. Rotate freely. They don't seem to attract as much dirt as the originals. I tried them because one of my original Dieldrin training wheels broke into 5 pieces during a ride leaving me with a long, hot Hike-A-Bike. Happy with the purchase, the price is excellent, I recommend them to others. However, before ordering, you must read the FAQ and reviews to decide if they are right for your bike setup.