Flint catchers
Peter UnderwoodFlint catchers came in several shapes and formats but they all aimed to remove flints, etc. from the tubular (or tyre) before the second revolution of the wheel which was when the flint would get embedded into the rubber and then with each further turn of the wheel work its way through until it punctured the tube. They weren't 100% perfect but they gave a sense of security, probably exaggerated. The downside was that in wet weather the catchers sent up a spray of water and grit which got everywhere.
Below are two examples of the
mechanical versions which were rather noisier and wore the tyres more
(thanks to Steve
Griffith for the images)
Both attach to the brake
centre-bolt and are inscribed with the maker's name
 All alloy Pelissier
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 Chromed steel TA Raclette
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The
less sophisticated versions were made from stainless wire and rubber
tubing including Allez and Carlton (not connected to Carlton cycles).
The impecunious rider could make his own from an old spoke and some
tubing. Some were double-sided whereas others were single and all-wire
and rubber.
 Carlton 'M', for use with
mudguards, with one arm rotated to show fixing eye for mudguard nut
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 This model was
marketed as 'Allez' - see advert below
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Advert from 'Bikeriders Aids - 1975
(Marten Gerritsen)
 Carlton CL ultra-light racing
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