163110-2RS Ball Bearing, 16x31x10mm Chrome Steel Double Sealed, 163110RS Bicycle Bearings for IRD Bottom Brackets, (Pick of 4Pcs)

• Fit Perfectly - ISO 492:2005 Standard, The aperture tolerance range is controlled between 7um, make sure fit great.
• Roll Smoothly - Internal G5 steel ball and synthetic grease, minimize friction, improve rotation efficiency.
• Without Backlash - Under the condition of non-laod, the radial swing play is within the 9um range.
• Dimensions Correspond - Inner ID 16mm, Outer OD 31mm, With B 10mm, match the rear hubs of the bike.
• Specialized recommends you replace these about once every 6 months with agressive riding and once a year for passive riding.

163110-2RS Ball Bearing 16x31x10mm Chrome Steel Rubber Sealed Show Some Love The bicycle is a beautiful thing — art and performance wrapped up in an awesome package. But they do not roll without the bearings. You can not steer, roll, or pedal without them. So show some love, and keep them rolling smoothly by knowing more about your bike from front to back. If your rotating components are not smooth, have a look inside to see what you can do for better performance. Fit Perfectly - Mounted on a 16mm shaft. Roll Smoothly & Without Backlash. Structures Designed For Bicycles.