Whenever I ride my 1980’s Guerciotti I am amazed at its performance. It is more responsive and faster than any of my other bikes, some of which are no slouches in the performance department. The only reason I don’t ride this bike more often is that 650c tire sizes are limited to fairly narrow widths, and given its racing heritage, it can’t (and doesn’t want to) haul a bunch of stuff.
The frame is built with Columbus Aelle tubing. The seat stays are small diameter, and the fork crown and seat cluster feature beautiful engravings accented with white paint against the royal blue main color.
I used Paul’s thumbies to bring the shifters up to the bar. The Tektro long reach brakes worked perfectly for this wheel size conversion (from 700c to 650c).
The frame had no eyelets or braze-ons for racks and fenders. So, I used zip ties to secure the fenders at the rear and p-clamps for the front fenders and front rack.
In keeping with its Italian heritage, I used a Campagnolo crankset, bottom bracket, and headset when building up the bike. The crankset’s arms are 170mm, and if I were to replace the crankset I would choose one with shorter arms as to address the low bottom bracket height after the conversion to 650c.
After 5 years of use, all these modifications are still working perfectly – it is a delight to ride and handles beautifully.
Early 1950’s Simplex dropout – long, horizontal, with eyelet.
Rear dropouts determine what derailleur options are available for a given frame. Rear dropout spacing also determines hub options, with derailleur equipped vintage bicycles having narrower spacing than their modern counterparts. And, the shape and style of the dropout are important as well: horizontal dropouts allow for wheel adjustment fore and aft, whereas vertical dropouts make rear wheel removal easier. Eyelets on the dropouts mean integrated fender and rack mounts, a definite plus.
Little attention is paid to this important feature of any vintage steel bicycle. Vintage dropouts include: old style Simplex dropouts (shown above – but often model specific), newer style Simplex dropouts, Huret drop outs (several styles), Campagnolo dropouts, Shimano and Suntour dropouts, and stamped or forged dropouts with no integrated derailleur hanger. Some vintage bicycles feature chainstays with integrated braze-ons or dropouts for Simplex, Cyclo, Huret and other rear derailleurs.
Chainstay braze-on for a Cyclo rear derailleur
1947 Simplex TDF with claw mount
Plain dropouts require a “claw” attachment for the rear derailleur or a braze-on or clamp for the chain stay. For vintage bicycles, plain dropouts without a hanger do not in any way indicate a lower end frame. Many nice upper end vintage steel frames did not have manufacturer specific brazed dropouts. So, do not be afraid of the “claw”. In fact, having plain dropouts on a vintage bicycle can be helpful, because derailleur options are automatically expanded, depending on the style of claw chosen.
The above Daniel Rebour drawings depict two different styles of Huret dropouts. Huret rear derailleurs can be a bit (translate “a lot”!) more difficult to set up than Simplex derailleurs. By contrast, setting up Shimano, Suntour or Campagnolo derailleurs with their matching tabbed and threaded dropout at 7 o’clock seems almost too easy.
1972 Mercian Shimano dropout
After the early 1980’s or so, dropout hangers were not so much an issue, because dropouts on derailleur equipped bikes after this point in time featured standard Shimano/Campagnolo hangers which were adopted as the standard by other component manufacturers.
Sheldon Brown’s dropout chart
Sheldon Brown developed this helpful chart shown above, although it is missing some key information. He does not address the baffling array of hanger styles which existed in days of yore.
A Simplex early style dropout with tab on the non drive side.
Hangerless dropout, requiring a claw
Campagnolo semi-horizontal dropouts on a 1970’s Jack Taylor
Stamped plain dropouts on an early 1970’s Raleigh with a 531 frame
There is only one resource on the web that seems to have a comprehensive overview of dropout styles and rear derailleur compatibility issues. This helpful chart can be found at a site called The Headbadge. Velobase also has an extensive database of vintage style dropouts. These resources can help anyone restoring a vintage bicycle determine whether and how to change the existing rear derailleur, and how to determine compatibility options.
In addition, there are a few other web resources that can help you with derailleur and dropout considerations:
The Dancing Chain by Frank Berto is also an important resource – even more so because it is in book form. If you don’t want to explore vintage derailleurs and dropout styles, the information presented in Chapter 15 – “How Derailleurs Work” will be worth the cost of purchasing this book. The author’s discussion of derailleur composition, chain gap, pulley spacing, cage geometry, and spring loaded pivots is invaluable to an understanding of how derailleurs work.
1953 Follis with integrated two hole Simplex bracket
I thought it would be nice to share some pages from the 1947 and 1962 Le Cycle Magazines that I recently acquired. Many pages feature the iconic drawings of Daniel Rebour, as well as informative ads from the builders and component makers of the time.
These publications revealed that Daniel Rebour, in addition to creating technical drawings for bicycles and components, also drew mopeds, scooters, and motorcycles, as well as complex engine and transmission parts. This was something I did not know previously. Before publishing this post, I contacted a few of the publishers who had used Rebour drawings in their printed materials, to determine who owns the copyrights to Daniel Rebour drawings. I didn’t want to publish them without obtaining permission. However, after months of waiting, I have received absolutely no response. So, I am including Rebour drawings in the photos below. If anyone objects – please let me know!
Various components from 1947 as drawn by Daniel Rebour
Trade show participants
Ads for Nervex lugs, Huret, and others.
More Rebour drawings from 1947.
The 1962 Catalog, photos shown below, was a real gold mine:
The cover for the 1962 edition – mopeds and cafe racers were featured along with bicycles.
48cc Ducati engine. If I had known about this little moped as a child, my parents would never have heard the end of it. Instead, I rode around on a little Honda CT70.
Heralding Simplex’ disastrous foray into plastic, Rebour dutifully portrays these hideous components.
A sexy 1962 Benelli Cafe Racer.
Mafac – the best brakes pretty much of all time.
Ads for Bertin, T.A., Atax and Tank.
More lovely Rebour drawings – the bicycle depicted is a Rene Herse.
Cafe racer style moped from Motobecane – 1962 model.
These are just a few of the pages from the magazine. These resources are invaluable to me as a restorer, revealing not only the trends and developments of the age, but also technical and cultural information which aids in the restoration process.