Re: [CR]RE: 4 Different B/B specs.


Example: Production Builders:Cinelli
Date: Tue, 21 May 2002 22:04:05 -0700 (PDT)
From: "David Feldman" <feldmanbike@yahoo.com>
Subject: Re: [CR]RE: 4 Different B/B specs.
To: Sheldon Brown <CaptBike@sheldonbrown.com>, Huemax@aol.com, classicrendezvous@bikelist.org
In-Reply-To: <v04210164b910c0ed6411@[10.0.1.25]>


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


--- Sheldon Brown wrote:


> At 10:54 PM -0400 5/21/02, Huemax@aol.com wrote:

\r?\n> >Thank you for all your help regarding my question

\r?\n> about "4th Bottom bracket?"

\r?\n> >

\r?\n> >Here is the final correct information;

\r?\n> >

\r?\n> >Please note R/H (right hand) thread is described as

\r?\n> C.W.(clockwise, right

\r?\n> >trun) screw.

\r?\n> >And L/H (left hand) thread is C.C.W.(counter

\r?\n> clockwise, left turn) screw.

\r?\n> >

\r?\n> >NAME SIZE THREAD PITCH/SIZE

\r?\n> FIXED SIDE

\r?\n> >ADJST SIDE

\r?\n> >

\r?\n> >British 1.370" 24 TPI

\r?\n> C.C.W.

\r?\n> > C.W

\r?\n> >

\r?\n> >ITALIAN 36 (mm) 24 F

\r?\n> C.W.

\r?\n> > C.W.

\r?\n> >

\r?\n> >FRENCH 35 1

\r?\n> C.W.

\r?\n> > C.W.

\r?\n> >

\r?\n> >SWISS 35 1

\r?\n> C.C.W.

\r?\n> > C.W.

\r?\n> >

\r?\n> >I still do not know the"1" at thread size stand

\r?\n> for, maybe 1 inch=25.4mm??

\r?\n>

\r?\n> No, that means 1 millimeter per thread, equivalent

\r?\n> to 25.4 TPI

\r?\n>

\r?\n> (metric threads are designated in mm per thread; the

\r?\n> inverse of the

\r?\n> English threads per inch approach.)

\r?\n>

\r?\n> All of these dimensions are listed in the Bottom

\r?\n> Bracket entry of my

\r?\n> Bicycle Glossary

\r?\n>

\r?\n> Sheldon "http://sheldonbrown.com/glossary" Brown

\r?\n> Newtonville, Massachusetts

\r?\n> +---------------------------------------------+

\r?\n> | I will be appearing in the Spring Revels |

\r?\n> | With John Roberts & Tony Barrand |

\r?\n> | June 21-23, http://www.revels.org |

\r?\n> | Sanders Theatre, Cambridge, Massachusetts |

\r?\n> +---------------------------------------------+

\r?\n> Harris Cyclery, West Newton, Massachusetts

\r?\n> Phone 617-244-9772, 617-244-1040, FAX 617-244-1041

\r?\n> http://harriscyclery.com

\r?\n> Hard-to-find parts shipped Worldwide

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