On paper it looks like 1 cm, but let me show you on pics. And maybe "boot center" isn't the correct word.
This pic shows the '17-18 182 GPO on top and '11-12 180 BC on the bottom.
Both skis are lined up with recommended mounting point (dimple) side x side. EDIT: dimple location is at right edge of ruler in all images.
Note: GPO is mounted at -1.1 CM and BC is mounted on dimple; I mounted GPO like that to shorten tail and reduce tip in deep snow.
Looking at it like this, the GPO appears to have a longer tail and only a slightly more forward mounting point, maybe not what you'd call an extreme difference.
But then it looks a lot different when you look at the rocker radius of curvature on the tail - you can see how much shorter the tail of the BC is from dimple to contact point. Compare that to the subtle rocker curve of GPO tail and how that extends the apparent contact point in soft snow.
And here is a look at the tip ... forward contact point of both skis is very similar except in deeper snow where the BC tip starts to get longer.
Additionally, you can see the longer shovel of the BC and more rocker height, so it's clear why some people think it skis deep pow better than GPO (especially when GPO is mounted on the dimple)
Conclusion: GPO skis much more center-mounted than just 1 cm difference on paper would imply. Disclaimer: not sure if BC mount point has moved since or if shape has been refined since 11-12.
And to be clear, I'm not trying to talk smack about either ski. I am at a point now where I really enjoy them both. They are both damn fun, and they do different things for me. I'm just not sure that, stylistically, a BC is the skinny equivalent of a GPO. The BC might be the closest standard (non-custom) shape that Keith has in his portfolio that skis like a skinny GPO, but I still think that even at similar flex stiffnesses they will still have different personalities.
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