Bearing colour code

[ckchin]

Like to know which bearing is the thickest ?
I check the manuel is start from 1-6 Blue,Black,Brown,green Yellow,Pink.
Brown and green is the middle size?

 

[one2dmax]

Blue

 

[Rusty McNeil]

I miked a selection of bearings and these things are REALLY close together. Hard to tell with a regular dial caliper mike. Once installed and plastiguaged then I could tell the difference.