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What difference does Boot Sole Length make?

post #1 of 9
Thread Starter 

I was reading through some other boot related posts, and I saw someone ask about boot sole length, and I started wondering exactly what changing boot sole length would do. What effects would it have on the way your skis feel underfoot? 

 

Not really trying to solve an immediate problem here, but I'm interested in understanding how it all works.

 

Thanks.

post #2 of 9

Not certain there is anything happening here to worry about.  Toe and heel lugs are standardized in the sport.  Some manufacturers allow more toe room per size or to stiffen the boot may use thicker plastic, therefore in order to get the correct size inside it is necessary to adjust shell length.

 

Lou

post #3 of 9

Boot sole length affects delta angle.  Given a particular binding that has a 4mm stand height differential, heel 4mm higher off ski than toe, a longer boot sole in this system will have a lesser/flatter delta angle than a shorter boot sole.  Shorter boot soles create steeper delta angles and longer boot soles, flatter angles in the same binding.  This angle is an important consideration for fore/aft balance.

post #4 of 9
Thread Starter 
Quote:
Originally Posted by bud heishman View Post
 

Boot sole length affects delta angle.  Given a particular binding that has a 4mm stand height differential, heel 4mm higher off ski than toe, a longer boot sole in this system will have a lesser/flatter delta angle than a shorter boot sole.  Shorter boot soles create steeper delta angles and longer boot soles, flatter angles in the same binding.  This angle is an important consideration for fore/aft balance.

Great answer!  This is the kind of response I hoped to get. What kinds of things would be expected if the delta angle is off?  Could it cause difficulty with getting good edge grip?  What would be expected for steeper delta angles, and what would be expected for flatter delta angles?

 

Is delta angle something that can be calculated for a given skier, or is it more of a preference or feel kind of thing?

post #5 of 9

Actually treefiter, I think I may have answered this question just a few moments ago in one of the instruction threads about stance?  Read that post and if you need more clarification let me know.

post #6 of 9
Thread Starter 
Quote:
Originally Posted by bud heishman View Post
 

Actually treefiter, I think I may have answered this question just a few moments ago in one of the instruction threads about stance?  Read that post and if you need more clarification let me know.

Thanks Bud.  I found the post you are referring to.  If I'm understanding it the right way, assuming I use the same boots, if I switch to different skis with a different binding setup, the delta angle could change.  This would potentially shift the sweet spot, where I want to be balanced, resulting in a different feel.  So on one ski/binding, I might get better performance balanced more forward, and another might be more aft.  

 

Recently I got new skis, and I noticed that I felt like I wasn't as forward as usual, but it seemed to work.  I suppose this was my subconscious telling me where the new sweet spot is.  

 

I tried to go back to my old skis after a few weeks, and I don't think I was able to really find my way back to the sweet spot.  Any thoughts?  The old skis were Atomic Beta Race 9'16s (SL ski)and the new are Elan Amphibio 88xti all mountain skis.   

post #7 of 9

You are correct in your assumptions.  Changing delta will affect fore/aft balance noticeably.  Your Atomic bindings have about 2mm stand height differential whereas your Tyrolias on the Elans have 4mm.  So 2 mm difference is definitely discernible.  With a mixed quiver of bindings the best option, if not systems, is to shim all the bindings to be the same.  Ultimately having a quiver with all the same model binding makes it easier to just plate the boot sole to the desired dimensions.  

post #8 of 9
Thread Starter 
Quote:
Originally Posted by bud heishman View Post
 

You are correct in your assumptions.  Changing delta will affect fore/aft balance noticeably.  Your Atomic bindings have about 2mm stand height differential whereas your Tyrolias on the Elans have 4mm.  So 2 mm difference is definitely discernible.  With a mixed quiver of bindings the best option, if not systems, is to shim all the bindings to be the same.  Ultimately having a quiver with all the same model binding makes it easier to just plate the boot sole to the desired dimensions.  

Both bindings are systems.  They are what they are at this point.  I might just have to switch between them a little more often if I want to remain familiar with both setups.  Good information for future reference though.  If I knew about it earlier, I could have gone with the flat ski and put a binding of my choosing on it instead of the system.  Oh well.  Thanks again.

post #9 of 9

Bud is correct but left out something very important.  Delta is different from boot model to boot model so comparing different boots doesn't tell you anything since the boot ramp is probably different anyway.  So although he is absolutely correct about the effect it only applies if you are comparing identical boots.  Since only one of the sizes is the correct one for you, not certain it matters since you wouldn't by a looser fit in order to get less boot ramp.

 

Lou

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