Huret derailleur performance

A Svelto was good when new but wore very quickly even if maintained. Unlike the Eco which was never great but would go on and on and on and on and on. I suspect there are still some 1970s Ecos out there doing sterling work every day.
 
Yep, but back then it was 'clean airflow'. The only 'Aero' we had was a chocolate bar. If I recall, it wasn't long before the RTTC got their knickers in a twist over the levers and probably found another reason to ban Alf - something that they did on a regular basis.
 
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