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Mounting bindings with ball of foot mount

post #1 of 8
Thread Starter 

I have new skis, blizzard R power and volkl tigershark (thanks Mogsie). Both skis have the integrated binding setup with no center mark for the boot. Set the bindings at the marked length (315) and you are ready to go. If the center screw hold that holds the binding is the center mark for the boot then both are off. If I measure BOF both are off.

 

Which is a better setup, BOF or mfg suggested setup. 

 

Am I measuring the BOF correctly by placing a card in the tip and tail, measuring the difference and divide by half and this is where the BOF should be?

post #2 of 8

I don't know the answer to your particular question and I'm not familiar with your particular binding. So why am I writing?--to point out that in general, for bindings that have a BSL scale, setting the binding at your BSL may or may not give the correct forward pressure. You are not necessarily good to go--you still have to read the forward pressure indicator to be sure. Hopefully someone who knows this particular binding will correct me if I'm wrong.

post #3 of 8
Thread Starter 
You are correct forward pressure has to be adjusted and it is easily done
post #4 of 8
Quote:
Originally Posted by levy1 View Post


Am I measuring the BOF correctly by placing a card in the tip and tail, measuring the difference and divide by half and this is where the BOF should be?

That is how I have heard it explained a number of times. With the skis de cambered flat or pinched together.
post #5 of 8
Here is a excerpt from Skiing Mechanics by John Howe that might be applicable to your question.

Quote:
John Howe, Skiing Mechanics, pg41




…Binding placement standardization has been proposed by the ASTM ski safety committees. Most new boots have a midpoint boot mark that should be aligned with corresponding marked on the ski. This has the advantage of placing small or large boots in the same centered position on the ski. As a general rule, this mid boot location is about 6 inches behind the mid-chord length of the ski (6 inches behind the toe of a normal boot) and 3 inches behind the ski running surface midpoint. The result is that the center of forces acting through the leg, ankle, and boot concentrate on the ski about 9 to 10 inches behind the mid cord length of the ski. This coincides nicely with the typical narrowest point in the side cut, although it it is usually behind the flex center of the ski…
post #6 of 8

Here are two references for BOF mounting.

 

http://www.epicski.com/a/ski-binding-placement-fore-aft

http://www.epicski.com/a/positioning-ski-bindings-using-the-campbell-balancer

 

Personally I think it's worth looking into. I wear a size 11A street shoe. My foot measures 28 cm but I wear 26.5 Mondo boots. I've had two very competent boot fitters select this size shell and when fitted they work very well so I think it's the right size boot. If I were to go with the sole center make on the ski mounting mark I would be at least 1 cm to the rear of BOF. Am I good enough to notice a 1 cm mounting difference, I don't know but I like the way it skis.

My new skis for this season have a mounting plate so I could experiment with mounting position if something doesn't feel right.

post #7 of 8
Thread Starter 
If I understand it right on the rocker ski I would squeeze the skis together and measure but on a non rockered ski I would put it on the bench and measure it contact at tip and tail. I am measuring a volkl tigershark with what volkl calls early rise and a blizzard r power without rocker or rise. It is confusing on how to measure.
post #8 of 8

I'd be careful about treating a modern rockered ski like the older cambered when measuring with a card. The mount will be way back. I mounted some Chams where they told me to. Bliss. I mounted some Fischer Sbound 112's with Dynafits. Had no real clue as what to do with the Tele markings so I did the BOF CRS thing. Ended up remounting 8cm forward.

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