Phatman
09-15-02, 11:02 AM
whats the difference? how can i tell? I have a bianchi made in Japan...any guesses on type of bottom bracket?
Bicycle Mechanics - English v Italian bottom braket
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WorldIRC
09-15-02, 11:03 AM
if urr frame is not italian (eg not columbous) and is tange tubing (u said japan and tange is japan) then u have english threading..
L J Horton
09-15-02, 11:10 AM
The bottom bracket itself will have the size and threading etched on it.
WorldIRC
09-15-02, 11:29 AM
yah but if the bike is from japan, then its tange tubing which is usually english threading.
pokey
09-15-02, 03:42 PM
Even made in Italy frickin Bianchis have had English threads for some time. In any event,don't guess as some are prone to do,but check what's on the BB.
John E
09-15-02, 06:53 PM
The self-tightening British format is steadily becoming the single universal standard for BB threads on new bicycles. Unless you have a pre-1980 French frame, the rule is:
1) If the adjustable cup and lockring are 35mm = 1.375" in diameter, the fixed cup will be left-threaded.
2) If the adjustable cup and lockring are 36mm in diameter, the fixed cup will be right-threaded (boo, hiss).
Sheldonbrown.com has a good discussion of the four (two obsolete, one semi-obsolete) BB thread/diameter standards.
If you keep an old adjustable cup of known diameter in your junk box, you can readily assess any bike you encounter.
Incidentally, I have yet to read a cogent account of how Italian threading ended up with a metric diameter (36 mm) and English thread pitch (24 TPI).
--- In an increasingly metric world, why did English BB threading win out over Swiss?
1) If the adjustable cup and lockring are 35mm = 1.375" in diameter, the fixed cup will be left-threaded.
2) If the adjustable cup and lockring are 36mm in diameter, the fixed cup will be right-threaded (boo, hiss).
Sheldonbrown.com has a good discussion of the four (two obsolete, one semi-obsolete) BB thread/diameter standards.
If you keep an old adjustable cup of known diameter in your junk box, you can readily assess any bike you encounter.
Incidentally, I have yet to read a cogent account of how Italian threading ended up with a metric diameter (36 mm) and English thread pitch (24 TPI).
--- In an increasingly metric world, why did English BB threading win out over Swiss?
Timmy
03-18-03, 04:01 PM
I am going to order a BB from Ebay before I take off my old one. (switching to a triple) I have a 2002 Raleigh R700. Would that most likely have the English threading?
Phatman
03-18-03, 04:35 PM
yes. BTW, i am 99% sure that the bianchi is english
John E
03-18-03, 07:34 PM
Originally posted by Timmy
... I have a 2002 Raleigh R700. Would that most likely have the English threading?
Definitely.
I also confidently predict that within the decade, all new bicycles will come with English BB threads.
For those of us who collect older European bicycles, replacement parts availability is a growing concern. I did successfully rethread my (Swiss-threaded) 1980 Peugeot for an English fixed cup when I converted it to a triple chainring, but I do not claim this to be an exemplary practice!
... I have a 2002 Raleigh R700. Would that most likely have the English threading?
Definitely.
I also confidently predict that within the decade, all new bicycles will come with English BB threads.
For those of us who collect older European bicycles, replacement parts availability is a growing concern. I did successfully rethread my (Swiss-threaded) 1980 Peugeot for an English fixed cup when I converted it to a triple chainring, but I do not claim this to be an exemplary practice!