mosh bike crank bearings?

Coz

New member
i currently have a mosh brass 3 star and i can feel that the bearings are going bad.now im more street than anything but i enjoy a little flattop freestyle from time to time.so i heard from one of my friends that sealed bearings are very good but i wasnt really interested because i figured it was something that can get expensive fast and the other fact i was good on bearings.but now im not and im interested.my first question is how do you get the measurements for the diameter of the outside and the center?is it something you have to order speacle from a bmx cataloge or can i get them at the local auto parts store?and last but not least are they better?
 
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