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What kind of bottom bracket do I have?

From: Jobst Brandt

The four kinds of BB threads in common use today are:

Diameter Pitch Right cup thread Left cup thread
Italian 36mm 24F tpi Right Right
Britsh 1.370" 24F tpi Left Right
French 35mm 1mm Right Right
Swiss 35mm 1mm Left Right

Unless there is something wrong with the right hand cup it should not be removed but should be wiped clean and greased from the left side. The thread type is usually marked on the face of both left and right cups. Swiss threads are rare but if you have one it is good to know before attempting removal.

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