Originally Posted by
FBinNY
The part I think you're referring to is the "bottom bracket" which refers to either the part of the frames where the cranks attach, or the bearing assembly that supports them there.
In general, you can do an internet search for "bicycle parts terminology" or "glossary" or a similar phrase. Then it
s easier if you click on images, which will bring up a number similar to this one.
I thought that is what it is called but in the picture you posted, that name is not found. I think it is calling it the "Crankset" in the picture. But, what I need to know is how to know what to buy to replace it with. I have looked and looked for a parts manual for my bike and they don't exist. I find sites with bottom brackets, but I how do I know which one will fit my bike?