How do I know what size Bottom Bracket to buy for my bike(Fixie)?

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New member
I plan to buy a new crankset for my fixie.
and the crankset could fit 103mm-107mm bottom bracket.

Im going to go buy shop and they can help me.

I just want to learn how do I know what size?
I know you have to look at your frame because different bikes have different stuff.

thanks!
 
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