Markus in USMA 20970 writes about present British bicycle standards. I was writing in USMA 20963 about British bicycle standards from 1925 to 1945 as I have known them.
>Joseph B. Reid wrote on 2002-07-12 00:19 UTC: >> The British bicycle industry has from its beginning been totally non-metric. >> The usual tire diameter was 28" or 26" with a 1-3/8" cross section. I >>believe >> European manufacturers have copied some of the imperial dimensions, such as >> chain link length. > >The components used by the British bicycle industry are defined in BS >6102 "Cycles". The tyre and rim parts of that standard are identical to >ISO 5772 "Bicycle tyres and rims". I have copies of these standards, in >case anyone is interested in details. British Standards are commonly >available in many city council public libraries in the UK (you have to >ask the librarian usually). > >ISO 5775 tyre specifications list the width and diameter in millimeters. >An example for a "wire edge" tyre from the standard: > > A tyre having nominal section width 32 mm, nominal rim diameter 597 mm > and recommended inflation pressure of 400 kPa shall be marked as > follows: > > +---------------------------+ > | 32-597 inflate to 400 kPa | > +---------------------------+ > >The BS 6102-5 / ISO 5772-1 standard is around a dozen pages long and >contains a detailed specification of how to measure the section width >and rim diameter, as well as conversion tables to older tyre designation >schemes, including inch-based ones. > >Markus > >-- >Markus G. Kuhn, Computer Laboratory, University of Cambridge, UK >Email: mkuhn at acm.org, WWW: <http://www.cl.cam.ac.uk/~mgk25/> Joseph B.Reid 17 Glebe Road West Toronto M5P 1C8 Tel. 416 486-6071
