The mid-1980s were a disturbing time for Campagnolo. Tullio Campagnolo had died in 1983, SunTour's slant parallelogram derailleur design was clearly established as the dominant derailleur geometry, Shimano's SIS offered consumers reliable indexing and the mountain bike, a alien object that Europeans knew nothing about, was sweeping all before it. Campagnolo's, long successful, strategy of producing ever more refined variations of the 1951 Campagnolo Gran Sport, using ever more exotic materials, was suddenly exposed as being intellectually and even commercially bankrupt.

The obvious response would have been to produce a beautifully polished, obsessively engineered copy of the Shimano Dura-Ace 7400. And that is what Campagnolo belatedly ended up doing in the form of the 1990 Campagnolo Record (RD-01RE). But first Campagnolo had two goes at reinventing the derailleur on their own terms - the 1987 Campagnolo Croce d'Aune and the 1987 Campagnolo Chorus. In some ways these two wildly contrasting experiments were admirable efforts, even heroic failures. But they also remind us that, in the words of Mary Midgley, hubris calls for nemesis, and in one form or another it's going to get it!

The Campagnolo Chorus departed radically from all Campagnolo orthodoxy, and enthusiastically embraced the slant parallelogram - a technology that Campagnolo had been quietly rubbishing for two decades. But the Chorus did not only seek to ape SunTour and Shimano - it sought to outdo them at their own game. Its slant parallelogram could be set to one of two levels of slant. Position 'A' gave 5 degrees of slant, and was designed for close ratio sprocket clusters. Position 'B' gave 30 degrees of slant and was for wide ratio clusters. Switching between the two was a reasonably quick and painless process involving loosening and retightening two Allen key bolts.

In this way Campagnolo had cunningly solved a problem that had never existed. Virtually nobody regularly swapped their derailleur between their out-and-out racing bike and their touring bike. They had a close ratio racing derailleur on their close ratio racing bike and a wide ratio touring derailleur on their wide ratio touring bike and never the twain shall meet. Anyway, why would you buy a chunky long cage derailleur like this one and then go racing with it on setting 'A'? It makes as much sense as a low-slung, mid-engined, pick-up truck.

While solving this non-existent problem Campagnolo had, inevitably created a few very existent ones. The Campagnolo Chorus was heavy, the long cage version was a mere 69g or 40% heavier than the comparable SunTour Cyclone Mark-II GT. And the Campagnolo Chorus looked all wrong - with its b knuckle and p knuckle distorted by the need for the slant adjusting Allen bolts. Ugly, heavy and pointless - it's a tough act to beat - but for some reason I can't help loving it.

By way of an aside, although Campagnolo held patents for the basic concept of both the 1987 Campagnolo Croce d'Aune and the 1987 Campagnolo Chorus, these patents have some curious echos:

• Shimano applied for two patents for very similar designs in the late 1970s (Japanese Patent # S54-138252 and Japanese Patent # S54-15240 respectively). In the late 1970s Shimano had been struggling to escape the tyranny of SunTour's patents for the slant parallelogram design in much the same way that Campagnolo was wrestling with Shimano a decade later.
• USSR Patent # 921,939 from 1979 also shows a design with a lot of features of the later Campagnolo Chorus. It has been argued that Soviet bike technology had some influence in Italy in the early 1980s, most notably with the Soviet Tachyon aero track bikes (used at the 1980 Moscow Olympic games) heavily influencing the radical machine that Francesco Moser used in 1984 to break Eddy Merckx's longstanding hour record.

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This example of a Campagnolo Chorus is a long caged version that Campagnolo claim will handle a 30 tooth sprocket on setting 'A' and 34 teeth on setting 'B' - I am not sure whether to believe them.

The key to dating a Chorus (C010) is to look at the number of components of the parallelogram module that are, and are not, polished. I think this is a mid-period variant, perhaps from 1988 because all the components are polished except the inside parallelogram plate which has the stippled finish. The key features are:

• The inner parallelogram plate has a 'stippled chrome' finish rather than being just polished aluminium.
• The parts of the knuckles that hold the parallelogram pivots are polished aluminium.
• The parallelogram spring and slant adjustment Allen bolts have a matt finish rather than being shiny chrome.
• The adjustment screws have largeish (5.5mm) heads.

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• Derailleur brands: Campagnolo
• Categories: Campagnolo - the good stuff
• Country: Italy
• Date of introduction: 1988?
• Date of this example: unknown
• Model no.: C010-LG
• Weight: 240g
• Maximum cog: Setting 'A' - 30 teeth, setting 'B' - 34 teeth (Campagnolo)
• Total capacity: Setting 'A' - 35 teeth, setting 'B' - 37 teeth (Campagnolo)
• Pulley centre to centre: 62mm
• Index compatibility: 7 speed
• Chain width: 3/32
• Logic: top normal
• B pivot: unsprung
• P pivot: sprung
• Materials: aluminium