The part of your bike that contains the axis the cranks arms spin 'round. (The crank arms are where the pedals attach.)

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Crank Compatibility for my Orbea Hydro 2012

I have received as a gift a set of SRAM bb30 cranks. I would like to know if they fit my 1012 Orbea Hydro and if can I use SRAM Alloy GXP Bottom Bracket to fit it all together.
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Serial numbers on bottom of a pedal crank housing from a 50s era Schwinn?

Can someone please explain what these three numbers mean on the pedal crank housing? I believe this to be the pedal crank housing from a 1956 Spitfire Ladies Bike. The Schwinn Serial reads M0D502 ...
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Purefix Kieren Pro

TL;DR FRAME: Kieren Pro (68mm BB) Which BB is suitable for this frame? (want to use SRAM s100 crank) If BB must be Truativ 108 or 113mm, how do adjust chainline? Thanks for your time and efforts ...
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Choosing the correct Bottom Bracket

I have a 2011 Commencal Supreme DHV3 Team edition and I need to replace the bottom bracket. The problem is that I am confused about what the correct model to buy is. The tech book for the bike ...