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under binding canting?

post #1 of 6
Thread Starter 
The skier in question looks like so:

Travelling downhill on "neutral" feet, the right ski is tipped slightly to the inside edge. The left ski is tipped severely to the inside edge and a little bit toed in. So we have a knock-kneed skier, much more so on the left side. His performance has arrived at a plateau. We tried one of the little tests I read on here somewhere, the one where you find the center of your knee and see where it lines up... on the left leg, the knee "tracks" well to the inside (obviously) and a plumb line dropped from knee center to feet actually lands about 1 and 1/2 inches inside the big toe.

Anyone have experiences with underbinding canting to correct this issue? Does this practice void any warranties or compromise the performance of the binding? :
post #2 of 6
I had under-binding cants for a number of years, but I've switched to having the boot soles themselves modified. The problem I found with under-binding-cants were:
1) It makes it difficult to get a good tune. I don't know enough about tuning to know why this would matter, but it did.
2) It's really hard to demo skis (if this is an issue). You'll get used to having truly-flat skis really fast, and the next time you demo skis, the demos will feel awful since they aren't flat anymore.
3) You can't swap left vs. right skis to preserve your edges anymore.

As I said, I've since switched to having the boot-soles modified. It alleviates all three issues, so I find it to be a preferable solution.

post #3 of 6
The issue is first corrected with supportive foot beds to reduce pronation. That done, another possible issue is a short leg causing the uneven edging.
Most of the time good fitting practice can eliminate cants 80% of the time.
post #4 of 6
Most shops that do under binding canting have no binding release or warrenty issues.

If this skier is as far "out" of alignment as it appears, a full alignment cycle should be in their future. This starts, as Pierre suggested, with first stablizing foot a good custom foot bed, adjusting boot fore/aft balance, cuff to leg shaft (all these affect tracking) and finally cants. Worth the effort.
post #5 of 6
Another possible solution is shimming the boot between the liner and shell on the inside of the shin. I believe the material they (bootfitters) use is called "posting" material. It's like 1/8 to 3/16 thick dense foam rubber. This is done to correct lower leg alignment problems. My left boot is done this way.

Should probably go see a good bootfitter.
post #6 of 6
Sanity in a cant crazed world? Arcmeister and Pierre are bang on. I believe cants (boot planing or under binding) are greatly overused. Regardless the first step is to support the foot in neutral then align the cuff to the leg. This properly done leads to far fewer cases of really needing cants then is done. The stance balancing certainly helps as well as paying attention to ankle flexion and the fit and effect of the cuff. I-T band problems and other muscle tension can have a big effect and should probably be addressed to avoid further problems instead of simply treating a symptom of a greater problem with cants. A trip to a good Physio or chiroprator can assess pelvic misagignment or torsion as well. All worthwhile steps BEFORE jumping on the canting train.

I had never thought of the tuning problem but that makes sense. Most machines use some sort of bridge fastened to the bindings. If those bindings are askew it's going to be hard getting even pressure on the ski. You could pull the bindings everytime. I would favour boot planing but it does void warranties on the boot and binding interface.
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