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    I will go on record as saying I do prefer some flex under foot. Here is what I mean. Years ago, I was riding a 179 CM Morrow Matt Goodwill board with direct mounted Sno Pro toe and heel pieces. This was back when many boards required drilling, like skis, to mount. The next season I got the new Matt Goodwill board from Morrow, but now it had inserts, and, a dedicated Morrow only insert pattern. So I had to try Morrow’s traditional strap bindings. The Morrow bindings had an aluminum baseplate likely 6061, bent into a U shape to cradle the boot. Of course the form of the aluminum baseplate made it very, very rigid. I hated it. It felt like the board had a dead, flat spot in its flex, gone was the great ride of the previous years board. Of course my direct mounted toe and heel pieces did not inhibit the designed flex pattern of the board at all.
    After that, when I switched away from hard boots and rode soft boots for a number of years, I preferred Burton’s carbon loaded baseplates. They were fairly stiff and responsive, but not as stiff as a bent aluminum baseplate, and did not give the dead ride feeling that all the aluminum bindings had.
    When I started splitting, I realized pretty quickly that I would be going back to hard boots, it just made so much sense, and the new AT boots that were coming out were really light and relatively soft. Also, the Spark binding, even for all its considerable innovation, also resulted in a bit of that dead feeling which I remembered from aluminum strap bindings on solid boards. The Voile plate, by virtue of its shape, is pretty rigid as well, but it is fairly narrow, and the pucks allow for some give (until they break).
    Now with the Phantoms I feel like I have it all. The board halves are held in plane, the toe to heel response is really, really stiff and good, and the baseplate of the binding, being a flat plate of 7075, has some flex and give (especially medially and laterally) and allows the board to flex relatively naturally. I would not want the baseplate to be absolutely rigid, I like it to flex some along with the board (lengthwise), but toe to heel, I want response, and this is exactly what the Phantom bindings are designed to do.
    One other note. In discussion with Klem (Venture owner/designer), he noted that sometimes really stiff metal bindings will damage boards at their edges, where they point load the top sheet. Since the Phantom baseplate by design rests directly on the topsheet of the board, some flex is engineered in, as well as the corners having some radius to them, as to not overly stress the board and cause premature failure.


    I guess I should rephrase and use the term “keep the board in plane” and not use the word “flex”. that is what is being tested.
    Most metal hardboot bindings have a small bolting area and use rubber dampening rings to allow for a more natural board flex,even to a point that a few years ago people were running lexan plates under their bindings to soften point loading to keep them from damaging their boards.
    Phantoms by design have a large footprint to work as splitboard bindings. they may flex to allow board bend naturally and work when they are close to 0 to 20 degrees but when you run more aggresive angles as i do the “dead spot” would become huge.That is why stayed with overlaping delrin pucks.
    Now I know what your going to say,most people don’t run aggressive angles. What works for you doesn’t work for other people, that ok,not better or worse.
    As for test that i will post in the binding section when i’m done they wil be as close to a phantom base plate, mounted with typical 0 to 20 degree angles


    Vapor: Pretty much agreed. Phantom bindings do not allow more than 30 degree angles, their partially oval shape compensates somewhat for the property which you are describing, but these bindings were never meant to be used at angles over 30 degrees, and indeed do not allow for angles over 30 degrees. For sure, Phantom Bindings are designed to suit the riding styles of 99.9% of backcountry freeriders who ride at stance angles of <31degrees.
    Note that with a splitboard, those who prefer high angle stances, would be better off with a totally different design than that offered by Voile style pucks or Phantoms, as a board interface system at such large angles does not distribute forces across the board very evenly: looks like a potential oppurtunity for someone to develop a binding for the ten or twenty riders riding higher angles in the backcountry, with an interface which crosses the board at right angles, and then a binding above which allows for the stance angle. Of course, this would be heavier though.
    I ride at 24-27 F and 3-7 degrees (positive not duck) R. No problems or dead feel at these angles. Also note that this season Keffler made two versions, the very limited production lighter, softer flexing and semi-experimental Pho, and the slightly stiffer proven Alpha model. I suspect he will merge these together for the 14/15 season but am not sure exactly what will happen.
    I am not sure how applicable it is to talk about solid board carving bindings here, as these work in an entirely different fashion to what goes on with a splitboard (angles always over 45 degrees, high off of the board surface, much stiffer boots, very narrow boards, binding mounted from the center with damping at the edges, often mounted on a separate plate system, very little or no concern for weight, etc…)
    In any case, all good discussion.


    Zude and others who’ve modified this boot:

    The max forward lean on the stock Sideral is 16*. Do you know how many degrees of forward lean you’re getting after mods?



    Not sure? I’ll have to strap in and lean… my guess would be 26-30deg. I had the top strap lengthened and put in some eliminator tongues to provide more room to lean as well as a softer cushy feel to lean into. Besides filing the lock plate as far as i was comfortable with (maybe 1 cm). I’m also moding the plastic spine/highback by cutting both sides back about 2-3 cm to give more side to side flex. Phantoms on the way..(just add snow!)


    I am hoping to start more discussion of the sideral boots. I have been riding a pair of as yet unmodified 28.5 siderals this season, and have probably a dozen tours on them now. (its been a slow season in the pnw…) The voile mtn plate system has been working for me so far, but am aware of the shortcomings inherent to these bindings. After getting used to the very different ride performance from my deeluxes, I have been liking them more and more. Riding in powder, I have been leaving the the booster strap top buckle fairly loose to afford more forward lean/flex. This closely mimicks the forward flex of my softies. They fit my wide feet very well, and have performed excellently on some long tours, and a very cold two night camping mission. I have been stoked on the ride on a variety of terrain in mostly powder conditions – wide open steeps to hippy low angle stuff and even somewhat technical pillow lines have been fun in the sportivas. Its hard to not have fun riding powder though, regardless of whats on your feet. I recently rode the fuhrer finger on mt rainier in the awesome midwinter corn conditions we have had in washinton, but this long steep line highlighted a big issue with the boots. The booster strap works its way down off of the cuffs over the course of a run, resulting in a a loss of response on toeside turns.
    This happens much faster on my rear boot than the forward one. on a long run, I have to stop periodically and reset the strap – super inconvenient and annoying. The lip on the top of the cuff is very pronounced and would capture the strap, but the strap has doesn’t work up, it works down, where la sportiva placed a silly little lip in the cuff that does nothing. this would not be an issue if the aggressive top lip was placed underneath the strap. seems like a stupid design oversight to me. Has anyone else encountered this issue? what did you do to fix it? I have been thinking of fixing some sticky rubber to the inside of the strap, to keep it from migrating down, but a more mechanical, failproof solution would be nice.


    I’ve been riding these boots this season with dynafit toes and Phantom bindings. I’ve done a few mod’s to mine which I will eventually post final picks of. My mod’s; trimmed back the vertabrae arms both medial and lateral sides, extended exsisting strap by sewing on supplied extra strap, filed down lean bars (3cm or so) and bolted on supplied spoilers. I was thinking of zipties to hold the strap in place, this should work?
    My only issue at this point is the hard stop feeling when leaning back (this is mitigated by the spoilers). I to road the voiles last year and can attest to the fact that Phantoms are a leaps and bounds ahead for ride feel and board mending. The tour mode is also light years away from touring with my old sparks. This is now my dedicated mode of travel for the future. I would like to design a twin tipped ski/board for the future to take full advantage of the ski boots.


    Any updates with pics?


    Late response to Stew, but I run powerstraps (or Scarpa’s version of them) on my F1s for the upper cuff closer. To keep them from sliding down I just cut a slot in the overlapping portion of the cuff and passed the one end of the powerstrap through from behind. Not a fancy by any means but why add when you can simply take away!

    That was Pontus


    FYI: The Sideral is 50% off over at Backcountry right now. $349.48 instead of $698.95. The caveat being they only have it in 25.5 (US mens 8).


    Anyone tried out the new Sideral 2.0? It seems that this year’s model has a few changes that fix Stew’s (@jrsplitr) issues.

    knuckle dragger

    Guy Gaston

    Internet tells me people are having trouble finding crampons that fit these boots.
    What crampons fits the best?

    Guy Gaston

    Anyone sporting crampons on these boots? Ordered Black Diamonds Sabretooth, but these didnt fit at all.


    In the spirit of counting grams, these looks like they will probably work:
    Tech Crampon


    @beard-of-power I seem to remember Wildsnow saying Tech Crampons were cool if you never Fernch-stepped and knife-hard surface snow was never an issue where you go. I.e. it’s a nice quiver crampon (especially where grams count) but is unfit for general use.

    I think La Sportiva redesigned the radius of the rocker in Sideral 2.0 to fit more crampons.
    This guy says Grivel’s Haute Route fits another La Sportiva boot (with the same rocker-crampon-interference). Maybe it will work with Siderals?
    Lastly, I know it goes against the whole hardboot ethos, but have you tried regular strap (universal) crampons?

    A buddy of mine says he got it to work by swapping the toe bail and modifying the boot.

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    I really like my new La Sportiva Sideral 2.0 boots. I have not needed to do any mod’s to boots, what was really surprising. I have just warm pushed them, because I have quite wide feets, but nothing else. Really satisfied!
    Furberg Snowboards
    Black Diamond

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