Bearings
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.
DETAILS
Item: 6904-2RS
Dimensions: 20 x 37 x 9 mm
ID (inner diameter): 20 mm
OD (outer diameter): 37 mm
Width: 9 mm
Without Backlash
Under the condition of non-laod, the radial swing play is within the 9um range.
Roll Smoothly
Internal G5 steel ball and synthetic grease, minimize friction, improve rotation efficiency.
Fit Perfectly
The aperture tolerance range is controlled between 7um, make sure fit great.