Review: 2021 Kastle MX88

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Re: Review: 2021 Kastle MX88

Postby HighAngles » Fri Apr 09, 2021 5:09 am

ErikCO wrote:I don't want to disagree with folks who have more knowledge and experience than I do, but my experience has not exactly mirrored that of others when it comes to PRD vs PRX. The difference in delta between those two bindings (4-5mm vs 7-8mm if I remember what Diana has told me correctly) makes a significant difference in my skiing. Diana recommended changing from PRX to PRD bindings on my superahape speeds and it made a significant difference in my ability to bend the skis to different turn shapes and to be able to brush turns instead of just lock and ride. I am sure some of this is a lack of technique development on my part (and was several years ago) but since I am going through similar problems currently in trying to find a backcountry/AT boot and binding combination that work for me, I thought I would post here. It seems that there are at least a few of us who are very sensitive to for/aft balance adjustments (combination of forward lean, ramp angle, and delta), so if you are trying a ski that a good PMTS skier has reviewed positively and are having a bad time with it, you may be one of us unfortunates who needs very specific binding/boot combinations.

For myself, I have given up (at least for now) skiing anything but a PRD/powerrail or a Freeflex/plate binding. The combination of a 4-4.5mm delta with a 16 degree forward lean in my RS130s works well for me and if I deviate much from it, my skiing or my fatigue level suffer. Others may not have the same experience, but that is mine, and my experience is validated by external observation. That was actually the reason for my earlier post in this thread. If the bindings the MX88 wad being sold with were a rebranded PRD, I would get a ski/binding combination. If not, I want a ski with no binding so I can mount something I know works for me and my body proportions.


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Re: Review: 2021 Kastle MX88

Postby jbotti » Fri Apr 09, 2021 7:28 am

From what I can tell those that max at a 4.5mm (or at any lower) delta notice a big difference going to the PRX (Diana included) and for those it is uncomfortable and not good for their skiing. Those that can handle more delta (me, Max. Harald) don't seem to notice much difference. I have yet to find a set up with too much delta and or too much forward lean. But I am 6 3" with legs of someone 6 6". This is not to say that this set up does not exist, just that I have never experienced it.
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Re: Review: 2021 Kastle MX88

Postby dougtee » Tue Apr 13, 2021 7:12 am

i am 6' with the torso of someone 6'6 so i think sticking with PRDs is the right answer with me. issue seems to be that they are drying up online and on ebay?
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Re: Review: 2021 Kastle MX88

Postby ErikCO » Tue Apr 13, 2021 3:32 pm

dougtee wrote:i am 6' with the torso of someone 6'6 so i think sticking with PRDs is the right answer with me. issue seems to be that they are drying up online and on ebay?


I don't know about stock levels of the PRDs, but the great thing about them is that you can swap them between skis. I have one set of the PRD 12 MBS bindings that I swap between 4 sets of skis. Set the BSL, check forward pressure, and you are good to go.
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Re: Review: 2021 Kastle MX88

Postby HighAngles » Wed Apr 14, 2021 6:28 am

ErikCO wrote:
dougtee wrote:i am 6' with the torso of someone 6'6 so i think sticking with PRDs is the right answer with me. issue seems to be that they are drying up online and on ebay?


I don't know about stock levels of the PRDs, but the great thing about them is that you can swap them between skis. I have one set of the PRD 12 MBS bindings that I swap between 4 sets of skis. Set the BSL, check forward pressure, and you are good to go.


I'd be interested in if you've checked the binding delta on the MBS variant of the PRD. I have a set from Fischer and they are MUCH lower delta than the regular Tyrolia/Head PRD binding. Do your MBS toe pieces have the 2 separate settings for GW/Alpine vs. WTR?
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Re: Review: 2021 Kastle MX88

Postby jbotti » Wed Apr 14, 2021 9:07 am

I would prefer to avoid having to spend my time correcting misinformation. So here are the delta's from the Head Tyrolia manual on the PRD GW bindings:

PRD 12 GW Brake 85 (F): 5.5
PRD 11 GW Brake 85 (F): 5.5
PRD 11 GW Brake 85 (G): 3.0

This is further confirmed by the stand heights of the toe and heel pieces which are 28.0 MM on all toe pieces and either 33.5MM on the the 12 heel pieces (and one 11) or 31mm on the rest of the 11s.

There is no negative delta on any of them!!
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Re: Review: 2021 Kastle MX88

Postby HighAngles » Wed Apr 14, 2021 2:06 pm

jbotti wrote:I would prefer to avoid having to spend my time correcting misinformation. So here are the delta's from the Head Tyrolia manual on the PRD GW bindings:

PRD 12 GW Brake 85 (F): 5.5
PRD 11 GW Brake 85 (F): 5.5
PRD 11 GW Brake 85 (G): 3.0

This is further confirmed by the stand heights of the toe and heel pieces which are 28.0 MM on all toe pieces and either 33.5MM on the the 12 heel pieces (and one 11) or 31mm on the rest of the 11s.

There is no negative delta on any of them!!


Maybe I missed it, but I don't believe anyone said anything about negative delta in this thread. Note that the MBS variant is a different animal. The AFD is higher in the Alpine setting than a regular PRD.
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Re: Review: 2021 Kastle MX88

Postby Max_501 » Thu Apr 15, 2021 11:52 am

https://issuu.com/zuzupopo/docs/w40718_ ... l_18_19_en

MBS 13 RC4 Powerrail Brake 85 [F]: 3.5 - 5.5mm
MBS 12 Powerrail Brake 85 [F]: 3.5 - 5.5mm
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Re: Review: 2021 Kastle MX88

Postby jbotti » Thu Apr 15, 2021 11:59 am

BTW, that 3.5mm is when using a GW sole. For regular alpine soles, the delta/ramp angle is 5.5mm which is higher than on some of the older PRDs.
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Re: Review: 2021 Kastle MX88

Postby HighAngles » Thu Apr 15, 2021 12:51 pm

I have found over and over, that the published numbers from Tyrolia/Head do not match my own measurements of real-world setups. Once you have the AFD height set properly and the delta determined, that's all that counts when you're getting your fore/aft alignment dialed in. Don't assume the published numbers are what you're getting. Also note that skis may have a different thickness through the binding mount area and you cannot assume that where the heel is mounted is the same thickness as where the toe is. This adds to the effective net delta that your fore/alignment must deal with.
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Re: Review: 2021 Kastle MX88

Postby Max_501 » Fri Apr 16, 2021 12:35 pm

I checked my bindings and they match the documented specs within .5mm (probably due to error in measurement so I'd say they are spot on).

For forum readers thinking about messing with fore/aft alignment it is a very complex topic. See this thread:

fore/aft Balance - Ramp Angle - Delta angle - Heel Lifts etc
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Re: Review: 2021 Kastle MX88

Postby HeluvaSkier » Fri Apr 16, 2021 1:27 pm

A quick note from my personal experience on fore/aft setup... I usually do not mess with someone's fore/aft setup until they are very far down their path to developing expert skiing, and only if it becomes apparent that it is the setup that is holding back their development. It is very easy to use fore/aft setup to compensate for technical shortcomings, so really should only be tinkered with if you're taking video of each setup on the same terrain (preferably same day) and reviewing that footage with a coach who truly knows what they are doing when it comes to fore/aft.
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