Bottom bracket thread size
This is opposite of most pedal threading and is done for diameter of the bottom bracket spindle and the size of.
Bottom bracket - Wikipedia
Bottom Bracket Standards
20 Jul The size of the shell is also different, with BSA bottom brackets using It's very rare to encounter an Italian threaded bottom bracket these days.
Our Guide to Buying: Bottom Brackets
Description:What Size Bottom Bracket Do I Need Size Really DOES Matter For those who are looking to upgrade the cranks on your mountain bike, or just need a replacement bottom bracket , it's very important to make sure you get the correct bottom bracket for the job. The two major dimensions that differentiate bottom brackets of similar types are the shell width and spindle diameter. Hopefully we can help clarify some of the more common bottom bracket sizes so that upgrading your cranks can be a simpler process. Because there are so many different bottom bracket variations, we think it is very important to always match the manufacturer of the cranks and bottom bracket to ensure the proper fit.
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