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K2 Coombacks- need advice

post #1 of 10
Thread Starter 

I am a seasoned BC snowboarder who recently made the decision to transition to BC skiing for a number of reasons that I will not bore you with in this post. I have been skiing resorts for several years and I would consider myself an advanced skier, not expert. I recently purchased a pair of K2 Annex 108’s in a 177 length and put a marker griffon binding on them. I love these skis as they have certainly expanded the amount of ski terrain that I can now comfortably ski. So, thinking that this was the ski for me, I went out and purchased a pair K2 Coombacks 104 in 177 length and equipped them with a Dynafit Radical ST binding. I figured that the similar shape and dimensions would make this the perfect BC ski for me.

 

Well, I have been struggling on these skis and I can’t figure out why. They feel squirrely and unstable. I just can’t seem to find my balance point on them. I have practiced with them in bounds on groomers and they seem ok, but as soon as I hit the crud and/ or the powder I just feel like I am completely out of control. Does the 4mm at the waist really make that big of a difference? Is there something else I should be looking at?

 

I should mention that I am 6’0” 178 lbs and my boot is a new Scarpa Maestrale. This is my first time on a tech binding, so I am wondering, is this a ski issue, a boot issue, a binding issue, or just skier error.  Could it be a case of not being used to the lightweight less driving equipment, or is this ski that much different? I have considered switching the tech binding over to the annex 108, but I love this ski at the resort and with my lack of experience on multiple skis/ BC ski setups, I am worried that this is not the real fix.

 

Open to advice!!

IdahoDawg

post #2 of 10
Is there a big difference in the forward lean of the boots compared to your old boots? Then look at the delta angle and where your centerline is. Because I feel like this is a center of mass issue, which might be magnified in stressful terrain.
post #3 of 10

The Coombacks are lighter and softer, the dynafits a less solid connection, and the Scarpa's less stiff than your Annex/Griffon rig--and you've changed everything at once. You probably need to spend more time with your new gear before you give up on it but at some point you have to decide how much stability and power you are willing to give up to get light weight. 

post #4 of 10
Exactly what they said. I used to have a pair of Sidestash's mounted alpine (Annex progenitor) and Coombacks mounted with Fritschis. The Coomback is definitely lighter and softer, but should ski with a nice easygoing manner, unless you're trying to crank hard fast turns on blue ice.

One additional factor is likely the ramp angle of the Dynafits. Big drop from heel to toe on those bindings. Have a search on wildsnow.com. Lots of ramp angle analysis over there. Some people add toe shims to reduce the heel/toe drop on those bindings.
post #5 of 10
Dynafits have a ton of Delta unless you shim the toe pieces, so you may be struggling with that.
Canmorebruce beat me to it!
post #6 of 10

Hmmm....  really can be a variety of things.  I'm skiing DPS Wailer 105 with Dynafit TLT Vertical and Scarpa Maestrale..... the ramp angle isn't an issue, but I do find changing my footbeds makes a heap of difference.....    I have a pair of soft footbeds which I use when my metatarsals on my left foot play up (hard only being able to tun to the left.... these footbeds have too much arch support so I don't feel as if I'm really connected to my ski boot, and my skiing falls apart (will get them fixed soon..... maybe).   When my left foot isn't playing up, my standard, hard, heat molded footbeds go in and my skiing improves out of sight.  Small things can make a big difference.

post #7 of 10
I'm on the Annex 108 as well. Good to hear your positive comments on those.

Try staying more centered when skiing your Coomback setup.
post #8 of 10

My most used ski is a Coomba, the pre-rocker version of the Coomback.  (The added rocker was very small.)  I agree with the others here that is is more likely the rest of your setup than the skis themselves.  The Coombas do like a more centered weight than some other skis.

post #9 of 10
Thread Starter 


Thanks for all the feedback. I will definitely look into this ramp angle issue. Taxman- Funny you mention the footbeds because I do have customs in my alpine boot but not in my BC boot. I just thought this morning that might be an issue. Will start with custom footbeds this week and see what that does. Then I will move on to the ramp angle and just getting more time on the skis. Thanks for all the great feedback. I was having a hard time believing it was just the skis as when you put them side by side, they seem almost identical in shape and dimension.

post #10 of 10
Quote:
Originally Posted by IdahoDawg View Post
 


Thanks for all the feedback. I will definitely look into this ramp angle issue. Taxman- Funny you mention the footbeds because I do have customs in my alpine boot but not in my BC boot. I just thought this morning that might be an issue. Will start with custom footbeds this week and see what that does. Then I will move on to the ramp angle and just getting more time on the skis. Thanks for all the great feedback. I was having a hard time believing it was just the skis as when you put them side by side, they seem almost identical in shape and dimension.

two skis ofg identical shape and dimension can have very different performance due to differences in construction. It is tempting when one is having difficulty to believe that a simple tweak like footbeds (you should be able to try your current ones in the new boots before you drop a lot of money on new ones) and ramp angle will solve the problem, but in general small tweaks fix small problems. A lightweight BC rig will never behave like a burly resort rig.

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