Chas. Colerich asks "The question that begs to be asked (at least by me) is where are these measurements being taken - at the ends of the drops, the widest part of the flats on the tops or where?..."
Then, answer it, I shall. The GB catalogue illustrates GB's measurement method for drop, reach, and width of its handlebars. For width, it is the distance between the centers of the handlebar ends where the sun doesn't shine.
.............
Peter Brueggeman said "I will answer with what was available around 1974, since you can install wider handlebars of later vintage of any brand. The 1975 Holdsworth Bike Riders Aids catalogue lists handlebars from Giro de Sicilia, Fiamme, Allez, Birmalux, Cinelli, and GB, with none wider than 16 inches (40.6 cm). For its widest handlebars, the 1966 GB catalogue lists its Capoberta bend at 16 inches wide and one of its Touring bends at 17.5 inches wide. The 1973 GB catalogues lists the Randonneur bend as its widest at 16.5 inches.
Tom Forbes asks " ...were GB bars ever available in 44-46 sizes?...I need an alternative to my 38's on my "74 Raleigh Pro...."
Peter Brueggeman
La Jolla California USA
4peebee(at)peterbrueggeman.com