How The Tail Got Twisted
the story of the curly stays

Jack Denny once described the purpose of the curly stays in a magazine interview. The idea was born in the 1930s when road races took place over bad roads, often over cobblestones. The raked fork in front absorbed some of the road shocks, but conventional straight rear triangles transmitted all the road shocks to the frame causing the whole bike to rattle and shake. This rattling and shaking is wasted motion and translates into lower speeds and lost time. Denny believed that a sort of a fork in back would absorb some more of the shock, resulting in less rattling and shaking and, in theory at least, less lost motion. The idea was not to provide a bouncy suspension, as on modern mountain bikes, but rather to let the dropouts vibrate--hence, the official designation, vibrant stays. The claim of the curly stays is untested, but it has been proven that suspended mountain bikes are faster over some kinds of terrain than conventional bikes, so there may be merit to Denny's idea. The curly stays do not offer any functional advantage to the cycling tourist, Denny said in the interview; nor, presumably, to the track cyclist. Nonetheless, many track frames were fitted with the elegant stays, and this brings us to another twist in the tale.

In the early days of cycle racing, amateur status was taken so seriously that a frame builder was not even allowed to 'advertise' his name on the bikes ridden; frames for amateur competition therefore bore no transfers identifying the maker. Unorthodox frame designs were allowed, however, and some frame builders used unorthodox designs to identify their bikes, if not for functional reasons. This explains the curly track bikes ridden by a number of successful riders in the 1930s.

The claim has often been heard, and is repeated by Hugh O'Neill in his historical article, that the curly stays also stiffen the bottom bracket. Why this should be so is not explained. However, the original patent application adds a significant point, namely that "both stay members are butted two gauges heavier than normal or standard gauges..." [line 35]. The stiffer bottom bracket must therefore be attributed to the heavier gauge tubing, not to the curl. What is not clear is, whether the heavier gauge stays were used throughout Hetchins production, or only until the introduction of Reynolds tubing (which post-dated the patent on the curly stays). In either case, the stays on 1930s Hetchins are markedly chunkier than the so-called pencil stays of the 1940s.

In the 1980s, round chain stays were replaced by oval-round stays. In 2020, the first curly was made of Reynolds 953 stainless steel.

1936 World and Olympic Champion, Toni Merkens, riding his 'no-name' Hetchins.

Hetchins frames featured some other unorthodox designs as well. For example, the hellenic and fastback stays which result in an equilateral triangle.

Hellenic stays cross the seat tube and anchor under the top tube. The name comes from Fred Hellens, who developed the design in 1923.

Hellenics often featured a pulley to guide the brake cable under the top tube, to be used with center pull brakes.

The first one was a VM design, sold in July 1967 (production started in 1966), others were produced with other lug sets (incl. Mag. Opus and Italia); the last was produced in 1979 or '80 (plus two recent ones built in 1987 and 1995). The design was not popular and only about 75 were made. They are rare and highly sought by collectors.
Proper Hellenics have seat stays parallel to the down tube [see white frame below]; forgeries often have the seat stays angled too steeply.

Below is a reprint of an article from 1967.

An Hellenic model was one of the three, and the one showcased in the article's foto. Its basic geometry and the ideas behind it are described in the article. Several Hellenics are featured at the Gallery section of this web site.

The second model described is more difficult to identify from the extant frames. If any reader is sure he has an exemplar, please get in touch with the Editor.

The third model, described as a Mk II Italianate, had seat stays integral with the seat binder bolt, and "steel lace" down the steat stays. Such a bike is featured in the Gallery section; click here to see an example.

Also of note is Alf's claim that he was exporting a hundred frames a year to the USA and that he (meaning Jack Denny) couldn't make them fast enough.

The hellenic design was straight, but three odd-balls are known to exist. Two are shown below: a curly hellenic triangle retro-fitted to a Vade Mecum; and a one-off half-curly from 1992. A third curly-hellenic was special ordered in the late 1990s.

The fastback design anchors on the seat tube below the seat lug.

The shot-in design anchors the stays higher up than the fastback, part of the seat lug but neither wrapping over the seat lug nor attached to the binder bolt.

The italianate design, pictured at the right, integrates the stays with the seat binder, giving a very neat appearance. This feature, and scalloped seat lugs, were popular in the 1970s and available on most any frame, not only on the Italia model.

Last but not least dept.

Above: ladies triple curly;
1999 Mixte model.

Above: Experto Crede with a double curl. The reason for the extra curl is not certain, but the long wheelbase suggests that it may have been a one-off suited to this particular geometry.

PS There were also conventional Hetchins stays.
They were called orthodox.

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