Boreas has Horizontal dropouts and it takes a bit of thought on how to take the wheel out- Even more 3 minutes later when you try and put the wheel back in. But once the wheel is in place- It is in place. I have had numerous occasions when I have replaced a wheel on vertical dropouts- only to find that the brake blocks do not locate properly- or the wheel is offcentre. And I have even forgotten to fully tighten the QR on verticals and wondered why The bike was so hard to ride. That does not happen with horizontal dropouts.
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How long was I in the army? Five foot seven.
Spike Milligan