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Is my procedure for finding Running Surface of Twin Tips ok?

post #1 of 6
Thread Starter 
I'm trying to get my feet wet with binding placement via BoF method and I was wondering how everyone else determines the running length of twin tips (which really shouldn't be different from non-twin-tips). In my approach, I took one ski and smushed it down on the linoleum and held it in place with my knee. I then slipped a heavy piece of paper between the ski and the floor until the paper wouldn't go any further. I marked the location of the edge of the paper with a pencil. I did this for the other tip and measured the distance between the marks. My 174 cm (sticker length) K2 Public Enemys had a running length of 142 cm. This seems more scientific than squashing the skis together base to base and measuring but I'm new at this and wanted to run it by some folks that have done it before.

Thanks in advance for your replies!
post #2 of 6
Your numbers sounds right- we measured a few different skis in the shop and found a few suprises as far as running length goes- a pair of 188 Gun LABs had a running length of around 160cm.

If the skis have already been mounted, I wouldn't bother redrilling them just to change the BoF position. I think more and more that its one of those things that people like to blame poor skiing on, kind of like alignment. If it were really all that important, you'd see many more shop employees and athletes worrying about it on their own equipment.
post #3 of 6
Thread Starter 
Quote:
Originally Posted by Takecontrol618 View Post
If the skis have already been mounted, I wouldn't bother redrilling them just to change the BoF position. I think more and more that its one of those things that people like to blame poor skiing on, kind of like alignment. If it were really all that important, you'd see many more shop employees and athletes worrying about it on their own equipment.
Thanks for the reply. They haven't been drilled yet. Perhaps it's just people don't know what they've been missing? Enter Noodler in 5,4,3,2...

I'll be on the fence until I do some a/b comparisions.
post #4 of 6
That's basically how I measured the running length of my Karmas. I clamped them flat to a workbench and slid a metal ruler under the tips until it stopped and marked that spot. Measure each ski twice to confirm the accuracy of your measurements. BoF for me, with 296mm boots, was 1 cm in front of the 'FR' mark on the Karmas.

Do they ski better (or different) mounted BoF? Don't know. But I love how they ski, and the feedback here and on other sites is that most skiers prefer BoF for most conditions. The exception is some powder skis are mounted further back to control tip dive.
post #5 of 6
The Public Enemies are really bizarre. I have a pair of unmounted 174cm 06/07 PEs and a pair of unmounted 177cm 06/07 Nordica Ignitions. The two skis are almost exactly the same height. When checking for where the running surface starts either by placing the ski on the floor and pressing down or by squeezing the pair together I find the PEs running surface starts way further down the ski than the Ignitions. I grabbed a few other twin-tips skis in the house (180cm V-Pros, 168cm Gotamas and 166cm Nordica Beasts) and all of them start the running surface well ahead of where the PE does. I'm not sure if I trust the normal methods for finding the running surface on the PEs since the edges will surely engage way further up the ski than the running surface suggests.
post #6 of 6
Rio, you are correct -- the PE has a very long tip and the running surface starts further back than other twins. I am writing up a review of the PEs and plan to cover this because it has implications on the ski's performance. The edges really do engage that far back.

To get the chord measurement of my PEs, I just placed them base to base and marked where the skis were tangent at the tip and tail (like I would do for any ski). This results in a 144cm running length for my 179cm PEs. Other similar sized twin tips have a running length about 10cm longer!!
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