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bottom bracket ID
Excuse my stupidity but how do i know if my bottom bracket is british or italian thread??
not sure if this information helps its a shim hollowtech ultrega in a ridley noah rs frame 
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2 comments
coIT
thank you for that so simple. i have English
thank you once again.
English has one right and one left hand thread/Italian is right hand thread both sides:
ISO/English or BSA 1.37 in x 24 TPI 34.6-34.9 mm
Left-hand thread drive side
Italian 36 mm x 24 TPI 35.6-35.9 mm
Right-hand thread both sides