• But it's quite unusual right? Never seen it before.

    Let me rephrase; on 'modern' tandems. Surely this configuration is inferiour (all aspects considered), otherwise it would still be widespread today?

    It's a saving in labour, not materials.

    Is it really though? You need to connect the two chains instead of shortening one extra. The time saving in labour seems negligible.

  • Is it really though? You need to connect the two chains instead of shortening one extra. The time saving in labour seems negligible

    And you're carrying around an extra 300g or whatever and the derailleur suffers from that extra weight through additional wear on springs, pivots jockey wheels etc. no?

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