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# Mathematics: Boot shim thickness.

This is a question for all you mathematicians out there.

I plan to use boot shims under my boot heel (or toe, as the case may be) to experiment with the fore-and-aft angle between my boot sole and my ski. The boot sole length of my boots is 291 mm. How thick (in millimeters) must a shim be to achieve:

1 degree difference,

2 degrees difference and

3 degrees difference?

The shims will most likely be duct tape for now.
Quote:
 Originally Posted by oboe 1 degree difference,
5.08 mm

Quote:
 2 degrees difference and
10.16 mm

Quote:
 3 degrees difference?
15.23 mm
Thanks, SJ. I'm really surprised at how much shim thickness is needed.
Quote:
 Originally Posted by oboe Thanks, SJ. I'm really surprised at how much shim thickness is needed.
oboe,

I don't believe it is practical or safe to shim the entire heel of your boot with duct tape. You will be complettly out of proper DIN Standard to interface with your heel cup.

When shimming with duct tape to experiment with cant. Only one side is out of spec.

when boot are ground for canting the top area of your bootsole that interfaces with the binding must be ground to return the overall height to DIN standard.

If you try this stay on very mild groomed slope. I am not sure your binding will even close correctly witht hat much tape on your heel.
Of course, you are absolutely tight, Atomicman. I've had boot soles ground for canting - which is permanent. I just want to experiment a little with ramp angle, delta, whatever you may call it, on new boots. And yes, a gentle slope will be the order of the day.

Thanks for your concern and for informing others.

My new boots have interchangeable lugs for the heel (and the toe) which is reversible. My bootfitter says to lift the toe - and I say to lift the heel (for my particular situation). We'll try each in turn and see how it works out.

Before the interchangeable lugs are used, I just want to know myself which would better suit me - raising the heel or raising the toe.
Quote:
 Originally Posted by oboe Of course, you are absolutely tight, Atomicman. I've had boot soles ground for canting - which is permanent. I just want to experiment a little with ramp angle, delta, whatever you may call it, on new boots. And yes, a gentle slope will be the order of the day. Thanks for your concern and for informing others. My new boots have interchangeable lugs for the heel (and the toe) which is reversible. My bootfitter says to lift the toe - and I say to lift the heel (for my particular situation). We'll try each in turn and see how it works out. Before the interchangeable lugs are used, I just want to know myself which would better suit me - raising the heel or raising the toe.
Are you skiing on Langes or Atomic boots?

What bindings are you on?
Ih ave messed with this some also, my boot guy said raise the toes. I tried it & took 1 run and switched back. I could not get over my skis. it also depends on the toe & heel height difference between your ski, plate, binding combo. many are alread 3-5mm difference. Oolder Atomic race skis were flat.

maybe i didn't give my toe high stance enough of a chance, but it was damn unnerving!
Atomicman, I'm with you on that - the theory kin the shop is one thing, but raising the toe will just mess up my skiing, I'm certain. From my experiences in skiing, and also roller blading and other activities over the years, I believe that I'll be helped by a bit more ramp, not less and not negative.

The boots are Lange 120 Comp MF [dying to translate the MF ] with the lugs that can be changed out, so no grinding is required.
Quote:
 Originally Posted by oboe Atomicman, I'm with you on that - the theory kin the shop is one thing, but raising the toe will just mess up my skiing, I'm certain. From my experiences in skiing, and also roller blading and other activities over the years, I believe that I'll be helped by a bit more ramp, not less and not negative. The boots are Lange 120 Comp MF [dying to translate the MF ] with the lugs that can be changed out, so no grinding is required.
Just so happens that is the exact boot I was in when I tried it.

I am considereing a pir of Head RD96 right now. already very upright with lower ramp. hurts like hell to get out of. But it really puts me in a very
good fore/aft balance position. But eve then my bott guy thinks i should try + toes by about 3mm.

I have a wide forefoot hihhg instep &7 narrow lower leg, so we wil be doing a lot of grinding if i go this route. Still am going to try on Atomic CS & Atomic Rt TI XS, Technica diablo Plug plus the 130 & 150 dobie before I decide for sure. But currently leaning towards the Head 96 RD.

I was very impressed with the wrap of my skinny lower leg and the upright stance of the Head. Also my rihhgt foot is quite a bit shorter than my left. Right measures 26 left 27. One advantage to the Head is sole only 310mm in a 27 where the Atomic is 314mm, my existing Salomon X2 are 313mm in a 27 and Langes are maybe even bigger and Atomic Store stock are like 317 in a 27.

I have had a lot of trauma to my right leg and jhave experimented with canting to no avail inside thick or outside thick does not seem to work either way.

I am going to a rolfer in a coule of weeks to see if she can rolf me into alignment! Kinda scary.

I picture nurse rachet with a big rolling pin!
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