Unique bb?

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11/4/2016 1:42 AM

I have a unusual looking piece to my cranks or bottom bracket and I wanted to know what it's for or if I'm just stupid and don't know common knowledge.Photo


11/4/2016 3:36 AM

It's unsealed.


It’s all bmx

11/4/2016 4:38 AM

Yeah, it's an unsealed US bb. That's the cone and lock nut