• why isn't the triple at the stoker's bb.

    The longer chain provides smoother running especially when cross-chained, spreading wear over twice as much chain provides longer intervals between replacement, the shorter front dérailleur cable keeps the front shifting in adjustment for longer, having the FD right under the person controlling it gives better feedback for shifting and trimming.

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

    spreading wear over twice as much chain provides longer intervals between replacement

    Hopefully at least twice as long, since you need to buy an extra chain with this configuration.

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