Crank bearing size calculation

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johnpclynch

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I have a worn crank bearing that I want to replace, how do you know what part to order??
Luckily this one had some green left on one side so I knew it was a size 4
IMAG0790.jpg

It's also easy to calculate from the markings and stamps as follows
5555-2331.JPG

Take the frame markings (on one of the front bosses)
and subtract each of the crank stamps for individual bearing sizes

Frame markings = 5 5 5 5
Crank stamps = 2 3 3 1
Bearing sizes = 3 2 2 4

Then, to order just convert the color to a part number
1 BLUE = 1FK-11416-01
2 BLACK = 1FK-11416-11
3 BROWN = 1FK-11416-21
4 GREEN = 1FK-11416-31
5 YELLOW = 1FK-11416-41
6 PINK = 1FK-11416-51
7 RED = 1FK-11416-61
 

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