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SL Racing ski Ball Of Foot (BoF) update...

post #1 of 21
Thread Starter 
Today I recieved my new 165cm Blizzard World Cup SL Magnesium slalom skis .

Measured the Center of Running Surface (CRS) by pressing the bases together, marking at the tip and tail where they touched each other. Running surface length started 7cm from tail and measured 140cm in length. That devided by 2 gave me 70cm so the CRS I marked 77cm from tail. Placed my boot on the plate and aligned the BoF mark with the CRS and TADAAA: Boot center mark on boot and on ski matched within a little less than 1cm aft (skimark aft) .

That is not an exact match offcourse but very close and could be an error I made with the BoF mark in my boot. Note that on my old Head iSL RD they were off allmost 4cm if I remember correctly.

Now remains to see how they perform on snow. At least this gave me insight in centermark markings and how different they are marked even on racing skis.

T
post #2 of 21
If your that worried you should call Blizzard and ask them if everything is ok.

IMO why waste the time doing what you did unless your an elite racer. For most of us, we couldn't tell the difference.

Sorry, that's how I feel.
post #3 of 21
You have never moved your bindings on a pair of skis then. I'm not saying his technique is right or wrong, only that moving your bindings + or - even a cm on a pair of skis makes a big difference.
post #4 of 21
The same as the old Atomic Centrix binding would slide. Yes it does make a difference.

May be I'm missing his point. Did he tell the shop he wanted them mounted in a certain spot?
post #5 of 21
Thread Starter 
Thanx for the input here boyz. MaxC, Im not worried because the midsole mark on the ski and the boot matched. The bindings are not mounted yet so I can tell the shop were I want them although I have such a big foot, mondo 29, that there really is not much room to fiddle arround with. I was also prepared to move the plate forward if possible but that seems to be unnessesary on the Blizzards. On my last years Head iRace that I have kept I just moved the plate 4cm forwards.

There is slight contradiction in your posts. First you say that we cant tell the difference and then you say that it makes a difference!? All I can tell you is that it makes a huge difference. I know because I used to test skis but on racing skis with modern racing plates moving the bindings arround is not that easy. And in my case not even possible, on my last years Heads the binding was as far forward as it whent and still the BoF mark was way aft of the CRS mark. Center marks on boot and ski matched.

I just felt that my skis wernt that quick into the turn last year. The year before that the binding was placed forwards a bit and the ski worked much better.

This discussion is offcourse not for everybody. Im usually met with arrogance in ski shops and by many coaches and ski intructors and other good skier but I dont really worrie because its what you feel when you ski that counts.
post #6 of 21
Wouldn't area have something to do with it too and not just length? I don't know, but I agree that a cm makes a big difference. It wouldn't hurt to check with blizzard.
post #7 of 21
tdk6,

From your post I conclude that ski manufacturers are now doing the right thing (at least on high end skis). The center mark on the ski aligns with the BoF theoretical mark very nicely. On my Head i.Supershapes the alignment was within 1/2 cm so Head is being smart about it too!

I also agree that moving the boot/binding location can make a huge difference to how the ski feel and reacts to input.
post #8 of 21
post #9 of 21
Each manufacturer mounts the plates slightly differently. Head mounts them the farther aft than most. IMO too far back. That's why almost all their skis are better in long radius, even some of their SL's. On my last Head iSL's I had the plate remounted 2cm forward and the skis handling improved %100. Now I'm on Atomics and love the variozone adjustment that can move them for or aft 2cm in seconds. Every high end binding should have this feature.
post #10 of 21
Thread Starter 
Thanks Ghost for the link to the thread. I had somehow missed it. Yes, Im a naval architect so I certainly think that area has a lot to do with it and is greatly affected by shape. I have a friend thats son is a promissing FIS racer and his custom ordered Head SL skis have a different shape than the regular RD's. I have not been able to compare but my friend told me they are much more narrow in the tail.

I have no need to call Blizzard since they matched the centermarks with the BoF position. I should be calling Head but as I allredy told you guys in annother thread, Head is supplying all next years RD skis without plates. Looks like some one beat me to that allredy.

Head First, interesting that you moved your plates forward on your iSL skis. I did that last week on my last years iRace overcutGS skis. They actually had the plastic plate that I now swapped for a real VIST GS plate and mounted something like 30-40mm forward. It will be interesting to see how they changed from last year. I remember that I had a hard time at the end of the turn. They were running wide.

TomB, very interesting that the Supershapes have their centermark aligned to the BoF measurement while the iSL RD's are 20mm aft....
post #11 of 21
tdk6,

Actually, when I mentioned that the Supershapes were within 1/2 cm I really meant that the mark was 50 mm aft.
post #12 of 21
Thread Starter 
Quote:
Originally Posted by TomB View Post
tdk6,

Actually, when I mentioned that the Supershapes were within 1/2 cm I really meant that the mark was 50 mm aft.
50mm=5cm
5mm=1/2cm

So was it 5mm or 50mm, still confusion!

5mm aft is not much but 50mm is a lot! The correct way of checking is to:
- find out the BoF on your boot and mark it on boot
- find out the CRS on ski and mark it on ski
- place the boot on the ski and align the BoF mark on boot with CRS on ski
- look if boot center mark on boot and boot center mark on ski align

On my Blizzards boot mark on boot was about 5mm aft. On my Heads boot mark on boot was about 30mm aft.
post #13 of 21
My Volants have a ball of foot mark
post #14 of 21
Thanks Ghost, I missed that one too
post #15 of 21
Quote:
Originally Posted by Ghost View Post
My Volants have a ball of foot mark
:Actually it says "boot toe". : I guess if I have the right length toe, I'll get the preferred mounting point by the ski designer.
post #16 of 21
tdk6,

I am such an idiot. I meant 5 mm. And I am an engineer too!
post #17 of 21
Quote:
Originally Posted by TomB View Post
tdk6,

I am such an idiot. I meant 5 mm. And I am an engineer too!
for NASA?
post #18 of 21
Quote:
Originally Posted by monkeyboy View Post
for NASA?
Beat me to it! (note to NASA:1" =0.0254 m even on Mars)
post #19 of 21
Thread Starter 
Quote:
Originally Posted by TomB View Post
tdk6,

I am such an idiot. I meant 5 mm. And I am an engineer too!
What counts is the theory . 5mm BTW is not that much.

Ghost, strange measurement that toe mark?! Makes a big difference if your foot is mondo 27 or 29!
post #20 of 21
Quote:
Originally Posted by tdk6 View Post
Ghost, strange measurement that toe mark?! Makes a big difference if your foot is mondo 27 or 29!
I've seen the toe mark on a few skis. Not really any worse - interms of the effect that sole length has on mounting point - than midsole marks. It just reverses which direction you move on the ski as sole lentgh increases.
post #21 of 21
I have a size 10 foot. I think the boots are 27.0. Average. It should be fine.
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