In this video we will be looking at shimano sealed cartidge bottom brackets and what the numbers mean specifically BB-UN54 73X113.

You can see a sticker on my background that says 62.6. This is a sticker for the local great cycle challenge in my area.
This channel supports the Great Cycle Challenge. Why? Because over 15,700 American children are diagnosed with cancer every year, and sadly, 38 children die every week.

It's a great cause and is open to everyone who likes to ride bikes.
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