
Originally Posted by
EWG
Necro bump but it came up somewhere else and I was pointed to this thread. Lots of good stuff here but I haven't seen this basic point mention yet, so I figured I'd add it for the record for future searchers. And also, as you read the below, I'm using centered weight point for progressive skis and forward weight point for trad skis as a shorthand. Yes, as mentioned in this thread it's not a static point, and trad and racing skis aren't really skied with the weight on the ball of the foot, but trad skis have weight further forward than progressive ones. So I'm hoping the below can be said without starting a semantic argument.
Mount point relative to boot size:
It's pretty complicated and depends on the type of ski. The recommended line is based on where the manufacturer wants the weight to be on the ski (ski loading point) - and how the ski is mean to be skied. To compare:
Take a progressive ski mean to be skied with a centered stance. The weight is dropping right through the middle of the foot, which should be right on the recommended mount point. So changing the foot size does not change the weight point.
Now take a traditional ski with a rearward mounting point and an assumed aggressive stance. In this case it's assumed the weight is forward - nearer the ball of the foot. This type of ski would require the boot center to change as boot size changes to keep the weight load point the same on the ski.
BUT - you have to think it through. Compare a 28 boot to a 22 in the second ski - keeping the ball of the foot in the same place is increasing the tail - which is a not big deal if you're driving the ski, but for something like a mantra, if you get it in bumps, that tail could become a real issue for a smaller footed skier. You could be elongating the tail by 4cm - which is quite a bit.
So the further you get from a 26 boot the more you have to consider the impact of the boot size change on the mount point - and the best formula (which sometimes is the least of all evils kind of thing) changes by ski, person, gender, weight, height, etc.
Hopefully I explained that well.
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