For example, some BSA frames have BSA and a 3 or 4 figure number cast into the base of the BB, this is just the casting number or perhaps a model number – it is not the frame number. Don’t be fooled by casting numbers, especially on the BB. It could be under the bottom bracket (BB) (Left), on the near side (N/S) (left when sitting on the bike) rear drop out, or on the seat tube cluster (saddle pin lug where it usually on the N/S but just sometimes on the back or O/S). These publications have been invaluable in adding accuracy to the information – but even including their data there are still well over 200 makes of possible lightweights to be confused over! The author would be grateful to know of any inaccuracies and to receive further information to make the tables more comprehensive.Įxamine the bicycle for the location of the frame number. This note was begun before the V-CC published the two volumes of Lightweight Catalogues wherein the various marque enthusiasts (ME’s) had set out frame number lore for their makes. Sometimes bicycles or frames are found with no makers’ transfers or badges on them –and occasionally with badges/transfers that are not correct! In these cases examination of the frame number – where it is, what it is, and how it is, may be of some assistance at least in allowing other specialists to hazard a guess at the true origin of the frame or machine. Possible identification of bicycle frames using only frame numbers – initial guidance
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