Old 07-22-19, 04:48 PM
  #8  
T-Mar
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Originally Posted by cudak888 View Post
...Do tell; most of the threads suggest Zeta was renamed to Aelle later in the 1980's....
You've got to stop believing everything you read on the internet and stick to reliable sources. The differences between Aelle and Zeta are fact.

Aelle was introduced for the 1978 model and used a carbon-manganese alloy steel. The plain gauge main tubes were 0.8mm thick and tubeset weight was 2345g

Zeta was a lower level set introduced for 1981 model year and used a carbon steel The plain gauge main tubes were 0.9mm thick and tubeset weight was 2440g.

Basically, Zeta was a very lightweight hi-tensile steel, while Aelle was a more exotic alloy with a higher tensile strength and therefore drawn to slightly thinner/lighter gauges for the main tubes and stays. Both sets used the same gauge for head tube, steering column and fork blades. Here's a scan of the relevant portion from the German version of the 1981 model year Columbus catalogue, showing the differences between Aelle and Zeta, and that they existed concurrently.
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