Something I'd like to know regarding parts size
standards: When (to the decade i.e. 30's, 40's, etc.)
were the currently-used standards established. I have
a recently acquired 1940's Italian bike called an
"Amerio" which uses a 22.0 mm ID steerer and has
English BB threads--go figure!
David Feldman
Vancouver, WA
> At 10:54 PM -0400 5/21/02, Huemax@aol.com wrote:
> >Thank you for all your help regarding my question
> about "4th Bottom bracket?"
> >
> >Here is the final correct information;
> >
> >Please note R/H (right hand) thread is described as
> C.W.(clockwise, right
> >trun) screw.
> >And L/H (left hand) thread is C.C.W.(counter
> clockwise, left turn) screw.
> >
> >NAME SIZE THREAD PITCH/SIZE
> FIXED SIDE
> >ADJST SIDE
> >
> >British 1.370" 24 TPI
> C.C.W.
> > C.W
> >
> >ITALIAN 36 (mm) 24 F
> C.W.
> > C.W.
> >
> >FRENCH 35 1
> C.W.
> > C.W.
> >
> >SWISS 35 1
> C.C.W.
> > C.W.
> >
> >I still do not know the"1" at thread size stand
> for, maybe 1 inch=25.4mm??
>
> No, that means 1 millimeter per thread, equivalent
> to 25.4 TPI
>
> (metric threads are designated in mm per thread; the
> inverse of the
> English threads per inch approach.)
>
> All of these dimensions are listed in the Bottom
> Bracket entry of my
> Bicycle Glossary
>
> Sheldon "http://sheldonbrown.com/glossary" Brown
> Newtonville, Massachusetts
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