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舊 2012-09-08, 14:38   #1
Mike
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Ski boots design

Basically there are 2 types of ski boots design: Traditional 2 piece (Clam shell) design and the 3 piece (Cabrio) design.

The traditional 2 piece design gives fantastic support and instant response. The overlap design necessarily either forces the boot to deform as you pressure it or makes the shell so rigid that nothing visibly deforms, but your balance movements have to be achieved without the ankle. The design is based on lateral stiffness without too much forward rigidity, but it comes at the price of locking your foot in virtually one position while eliminating almost all feel of the ski and the snow. Flex becomes "on/off."

The 3 piece shell (Cabrio) design makes for easier entry and exit and is supposed to be stiffer laterally than the 2 piece design. Cabrio design is a rigid open-top shell for the lower section with a hinged cuff and a separate plastic tongue that closes the boot and regulates flex similar to what the old Raichle Flexon used to do. If your goal is to connect with the snow and terrain as much as possible, then a 3-piece boot is the way to go. The 3 piece design shell let you flex your ankles better than a traditional ski boot because the hinge point is lower and farther back, closer to the actual hinge point of your ankle.

Looking at the construction of the 3-piece boots compared to the 2-piece boots more closely. With the 2-piece boots, there is considerable overlap in the lower shell across the top of your foot, but there is no overlap at all in the 3-piece design, instead there is a tongue. There is also less overlap in the cuff of the 3-piece. When you think about that design difference, it makes sense that it would be easier to flex a boot with less overlap. It is not about which design is better or more superior than the other. It is all about ankle flex, and whether your style of skiing and terrain prefer it.

Example of the 3 piece design ski boots are Dalbello Kryptons and Daleboots.

此篇文章於 2012-09-09 13:42 被 Mike 編輯。.
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舊 2012-09-09, 08:21   #2
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舊 2012-09-09, 08:27   #3
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Heel lift in women's ski boots

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舊 2012-09-18, 17:25   #4
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Forward lean

Forward lean of ski boots is something that often neglected. Some ski boots have more froward lean, some are more upright, so which one suits you?

According to one ski instructor in Epic, I quote - "Forward lean is all about leverage and where your particular body morphology is primed to balance and apply leverage to the shovel of the ski. Depending upon a few factors on the sagittal plane such as ankle dorsiflexion range, foot length, lower leg length, binding delta angle, boot board ramp, calf circumference, binding mount position, all factor into the formula. There is no one forward lean right for all.

One want to be standing in his boots, with skis on, in the best static position in which to move from while moving dynamically on his skis so that he can apply pressure to the shovels or tails to affect his skis as intended.

More forward lean requires a more flexed static stance and affects one's ability to pressure the shovels by requiring even more flexion to apply pressure to the boot tongue. Less forward lean requires a taller stance and requires less flexion to pressure the shovels.

The boots "net" forward lean is equal to the cuff's forward lean angle less the boot board's ramp angle (15 - 5 = 10 degrees Net forward lean) and should reflect the skier's dorsiflexion range of motion HOWEVER; This is not the end of the story. Where the knees plumb over the feet will also be affected by the "delta" angle created by the bindings (stand height differential created by heel thickness minus AFD thickness). This a very important part of the puzzle to consider as well. Then there is the binding mount position on the skis which again affects where the balance point is over the sweet spot of the skis.

Assessing and modifying these four parameters with an experienced competent boot fitter, using good methodology, will help you find your personal optimum position in your ski boots!"

What if you have a pair of ski boots that fits you perfectly and comfortably except for the forward lean which is too much? Can you decrease the forward lean?
According to some experienced boot-fitters in Epic, one of the limited solutions is to grind part of the upper cuff to open the angle a bit, if the lower and upper bottom on each other without adequate lean adjustment, and then rivet the cuff to the lower at a reduced angle. Some ski boots such as the Full-tilt, you can actually swap out/grind down the limiting blocks in the back of the boot to add/remove forward lean.
There are a handful of boot-fitters in the world that have the tooling and the know-how to properly change the forward lean to straighter upright on a two piece shell. The mitigating element is that some of the boots forward lean comes from the lower shell, so that even if you alter the contact point at the external spine and are able to fill in or weld the holes in the cuff or lower and re-drill, you still have to deal with the gap that would open up between the lower shell and the cuff spine.
One of the options that exists is heating the top of the spoiler and flaring it back to decrease the forward lean force high on the calf. This is a way to help clear the lower leg when the skier has a large calf.
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舊 2016-06-13, 12:30   #5
Mike
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Interesting read on the origin of the 3-piece boot design: https://www.skiinghistory.org/histor...piece-ski-boot
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