• Could work. Would quite like to use both brakes. Ideally it would be 12 x 142 and have two ISO disc mounts, but that's quite a niche.

  • Mack has the same mounting face spacing as the 110×20 hubs, lines up with track cranks but not brakes.

    Effigear seems to be an aluminium HG spline cut straight into the hub shell, there's no way I'd use that. Even a threaded sprocket would be better.

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