Re: [CR]Handlebar clamp diameter question

(Example: Framebuilding:Technology)

In-Reply-To: <l03130300b68e29e0cb81@[128.111.201.65]>
References:
Date: Fri, 19 Jan 2001 14:26:29 -0500
To: Monkeyman <monkey37@bluemarble.net>, classicrendezvous@bikelist.org
From: "Sheldon Brown" <CaptBike@sheldonbrown.com>
Subject: Re: [CR]Handlebar clamp diameter question


Brandon"monkeyman"Ives wrote:
>Everyday you should learn something new. Today I learned about 23.8mm
>clamp diameters. Well I really started into my Raleigh Lenton Grand Prix
>project and found a major snag with the stem while tring to install a 25.4
>GB bar, it just won't work. The stem I'm using I thought was correct, it's
>a chrome lugged Raleigh stem with a cone expander and tall quill. Anyway
>while looking at ye olde Sutherland's Manual but something called 23.8
>clamp diameter, or 15/16" for the non-metric. What's up with that? Does
>anyone have a drop bar they're interested in getting rid of in the correct
>diameter? I'm not going for period correct just ridable right now. I'm
>looking for cheap right now. Any info would be great.

15/16" was the old British standard for steel bars, they used 1" (25.4 mm) for aluminium ones.

This applied to both drop and upright bars, the distinction was based on materials, not shape.

This issue is addressed with some thoroughness in the "Stem" entry of my Bicycle Glossary: http://sheldonbrown.com/gloss_st-z.html#stem

Sheldon "FAQ" Brown Newtonville, Massachusetts +---------------------------------------------------------------+ | The poet Henry O'Meara (1848-1904) was my great-grandfather | | I've put his book "Ballads of America and Other Poems" | | on the Web at: http://sheldonbrown.com/omeara | +---------------------------------------------------------------+
      Harris Cyclery, West Newton, Massachusetts Phone 617-244-9772, 617-244-1040, FAX 617-244-1041
            http://harriscyclery.com
       Hard-to-find parts shipped Worldwide
            http://captainbike.com
    Useful articles about bicycles and cycling
            http://sheldonbrown.com