Dynafit & Maruelli Anti-Twist Installation for Radical Binding

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This post by WildSnow.com blogger  

Pictured below are step-by-step instructions to install both the Dynafit anti-twist as well as the Maruelli manufactured anti-twist devices on Dynafit Radical ST/FT backcountry skiing bindings.
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Please note: The instructions detailed below do NOT apply for Radical versions 2012-2013; anti-twist nodes will be factory installed for newer bindings.
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1.Dynafit manufactured Radical anti-twist installation.

Dynafit manufactured Radical anti-twist upgrade. Unpackaged includes: 6 PH1 screws, top, and bottom plastic anti-twist nodes.

Dynafit manufactured Radical anti-twist upgrade. Unpackaged includes: 6 PH1 screws, top, and bottom plastic anti-twist nodes.

Dynafit manufactured Radical anti-twist upgrade size comparison.

Dynafit manufactured Radical anti-twist upgrade size comparison.

Remove binding heelpiece from plate. Match up top and bottom of anti-twist to left side of each heelpiece.  Line up each plastic node to ensure proper fit. Minor sanding maybe required. NOTE:Dynafit Radical heel pieces do not feature a left and right identification.

Remove binding heelpiece from plate. Match up top and bottom of anti-twist to left side of each heelpiece. Line up each plastic node to ensure proper fit. Minor sanding may be required. NOTE: Dynafit Radical heelpieces do not feature a left and right, so the anti-twist parts do not have a left and right configuration. Also, with earlier Dynafit Radical bindings we recommend totally removing the anti-rotation pin inside the heel unit. This will pop out when you remove the heel unit to access the brake.

See here for directions on how to remove Radical heelpiece.

Once aligned, prethread the holes by screwing a screw part way in to aid in installation. Optionally, blue Loctite can be added for further security. A Phillips #1 screwdriver is used for all screws.

Once aligned, prethread the holes by screwing a screw part way in to aid in installation. Optionally, blue Loctite can be added for further security. A Phillips #1 screwdriver is used for all screws.

Dynafit supplied Radical anti-twist installed 5 minutes later.

Dynafit supplied Radical anti-twist installed 5 minutes later.

In tour mode the plastic nodes prevent twist in the binding.

In tour mode the plastic nodes give a firm twist resistance in the binding due to the spring-loaded brake plate pushing the anti-twist up against the binding.

As seen here, and subsequently bench tested, a user can easily twist the binding past the installed node with very little effort. Additionally, with anti-twist pin removed twisting in any direction is fine.

As seen here, and subsequently bench tested, a user can easily twist the binding past the installed node with very little effort. Additionally, with anti-twist pin removed twisting in any direction is fine. Experiment. For example, if your ski is off your foot and you hold the brake down by hand, rotation is easy in either direction.

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2.Maruelli manufactured Dynafit Radical anti-twist installation.

Maruelli supplied Radical Anti-twist version. Included in package: 2 anti-twists, 4 nuts with nylon locking insert, and 5 .5mm Allen head bolts. One extra in case you drop it!

Maruelli anti-twist for Dynafit Radical FT/ST. Included in package: 2 anti-twists, 4 nuts with nylon locking insert, and 5 .5mm Allen head bolts. One extra in case you drop it!

Remove heelpiece and prepare for installation. NOTE: aligning holes on heelpiece and Maruelli unit.

Remove heelpiece and prepare for installation. If your heel unit has the internal anti-rotation pin, removal is mandatory if using the Maruelli solution.

See here for directions on how to remove Radical heelpiece.

Flip heelpiece over and install Maruelli unit on underside of plate.

Flip heelpiece over and install Maruelli unit on underside of plate.

Maruelli unit must go under plate at the cut oval.

Maruelli unit must go under plate at the cut oval.

Grasp firmly or clamp ski brake down and bolt each nut with .5mm Allen key. 2 bolts per heelpiece.

Grasp firmly or clamp ski brake down and bolt each nut with .5mm Allen key. 2 bolts per heelpiece.

Maruelli heelpiece installed on brake.

Maruelli heelpiece installed on brake.

If bolts protrude on either side of Maruelli anti-twist they can be trimmed with a Dremel or file.

If bolts protrude on either side of Maruelli anti-twist they can be easily trimmed.

Maruelli top view with brake activated exposing protruding bolt.

Maruelli top view with brake activated exposing protruding bolt.

Maruelli unit does not allow the Dynafit Radical to twist counterclockwise out of touring mode under any circumstance. Thus, it could be a viable option despite the lighter weight and easy availability of the Dynafit solution.

Maruelli unit does not allow the Dynafit Radical to twist counterclockwise out of touring mode under any circumstance. Thus, it could be a viable option despite the lighter weight and easy availability of the Dynafit solution.

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After bench testing and weighing both Dynafit and Maruelli manufactured Radical anti-twist upgrades here are the stats:

1.The Dynafit solution will work for most skiers. With the internal anti-rotation pin removed and the brake held down by hand you can rotate the heel either direction. In tour mode, because the brake plate rises up under spring load, the binding is prevented from rotating counterclockwise out of tour position.
2.If you do NOT want any possible counterclockwise rotation past tour mode on your Radicals chose the Maruelli version.
3.The Dynafit version weighs 4 grams per binding and the Maruelli version weighs about 24 grams per binding.

Go forth MOD and SKI!

The best deals on Dynafit Radicals can be found here from our friends at Backcountry.com.

Pick up a pair of Maruelli Radical anti-twists here.

Comments

26 Responses to “Dynafit & Maruelli Anti-Twist Installation for Radical Binding”

  1. Marius December 3rd, 2012 1:15 pm

    For the uninitiated, like me, what is it this is supposed to prevent, practically? How will I notice the difference when I am out skiing?

  2. Joe December 3rd, 2012 1:43 pm

    @Marius Addresses a common problem of auto-rotating when you are in Tour mode. Thus some users noticed their binding engaging into ski mode, forcing the brake to engage. The Maruelli vs. Dynafit manufactured anti-rotate is totally up to you. But as I stated in the post new Dyanfit Radicals will have the anti-rotation node pre-installed.

  3. OMR December 3rd, 2012 2:02 pm

    Joe, what do you suggest for Speed Radicals?

  4. Marius December 3rd, 2012 2:46 pm

    Thanks for putting it in plain text for me Joe! Ive got last years Radicals, but I havent been bothered with the brakes engaging while touring, not once. So I guess I dont need these?

  5. Nick December 3rd, 2012 2:57 pm

    Are those Dynafit parts a warranty item?

    (I did e-mail them and got no reply)

    So far I’ve had one of the weak link pins break, so I will get them even if I have to pay.

  6. Lou Dawson December 3rd, 2012 3:21 pm

    Nick, I’m pretty sure the “upgrade” is free. They told me they’d have to silence me with black ops means if I called it a “recall.” Whatever the case, take the PINS OUT and use the external solution. The pins cause problems, such as the binding heel breaking… Lou

  7. Dave December 3rd, 2012 7:08 pm

    Hey Nick I contacted Salewa and they sent me the plastic pieces no charge. I live in Canada and was worried I was going to get dinged with broker fees at the border but didn’t have to pay anything.

  8. Pavel December 3rd, 2012 9:10 pm

    I wonder whether any of these work with pre-Radical Vertical ST heel. Mine is rotating into downhill position while sidehilling on a compact snow, with riser in middle position, on 112 mm underfoot skis.
    Thanks in advance.

  9. John Gloor December 3rd, 2012 11:19 pm

    Lou, I have last years Radical model and need the “upgrade”. Could you post any contact info you have for Dynafit users who want to go that route”

  10. Lou Dawson December 4th, 2012 6:21 am

    John and all, here is a link to the Salewa Dynafit contact information:

    http://www.wildsnow.com/693/psa-dynafit-north-america-is-available-to-help-you/

  11. Lou Dawson December 4th, 2012 6:23 am

    Pavel, check the photos in the post. The anti-rotation is designed to hold the heel unit in one certain position that happens to _not_ be the position you’d like. Lou

  12. Lou Dawson December 4th, 2012 9:08 am

    OMR, for most people the Dynafit option will work fine and that’s what we all suggest. Lou

  13. Shawn December 4th, 2012 10:52 am

    Sorry for what might be a dumb question Lou but I’m going to ask it anyway. Does this mean that when switching from ski/tour you rotate the heel 3/4 of a turn counter clockwise and tour/ski a 3/4 rotation clockwise? A 1/4 rotation would be sweet especially from tour/ski when transitioning without removing skis.

  14. OMR December 4th, 2012 10:57 am

    Sorry, I should have been more clear; Speeds have no brake and it appears the fix attaches to a brake. I haven’t had any problems, but wondering what the options are.

  15. Lou Dawson December 4th, 2012 11:11 am

    OMR, current Speed Radical have external anti-rotation, or are you talking about older versions? If so, I think Maruelli might have some options, but the stuff above only works with brakes.

    http://www.wildsnow.com/8568/dynafit-speed-radical-review-binding/

    Lou

  16. Shawn December 4th, 2012 11:13 am

    Oops…knew it was dumb. I see that it “can” be rotated both ways with the dynafit mod. Any potential damage or pre-mature wear to either the binding or anti-twist by rotating against the anti-twist? Will be nice to make 1/4 rotation when going into ski mode. Cheers.

  17. Lou Dawson December 4th, 2012 11:15 am

    Shawn, with ski off and hand holding the brake plate down, you can rotate either way all you want, with the Dynafit external anti-rotation and internal pin removed. Lou

  18. travis December 4th, 2012 3:41 pm

    Anyone want the Maruelli solution cheap? I have two that I won’t be using. travisfeist@yahoo.com

  19. Chris Sturgeon December 4th, 2012 5:40 pm

    Hi Lou,
    Many sorries for the off topic: I’m looking at a ski with a pair of Tri-step heel pieces (no brake) mounted with TLT Vertical toe pieces. By eye, the ramp angle seems a bit forward. Do you, or anyone else, know if this is a safety or performance issue? Thanks you.

  20. Lou Dawson December 4th, 2012 6:01 pm

    Weird. Someone must have gotten their hands on some spare parts.

    At any rate, the Radical heel pins are the same height off ski as Tri-Step, Vertical, and Comfort (give or take perhaps 1/2 millimeter. So what you’re seeing is just the typical ramp angle of most tech bindings, which can be a bit much but is not as much as you might thing since AT boots sometimes don’t have as much built-in ramp as some alpine boots, and so on…

    If you want less ramp with that TLT toe piece you can get shims from B&D.

    Lou

  21. Chris Sturgeon December 4th, 2012 6:52 pm

    Thanks, Lou. I guess it could be worse: A first gen Tri-Step toe and a first gen Radical heel! Good to know about the nearly identical heel pin height.

  22. Lou Dawson December 4th, 2012 7:42 pm

    Chris, LOL, that would indeed be the ultimate punishment for you early adopters that believe things like magazine “Editor’s Choice” awards. (grin)

  23. Nick December 5th, 2012 10:20 am

    Problem solved and parts on the way after I e-mailed to custsvc using the website dynafit.us (my original e-mail that got no response was sent to info@dynafit.us – the contact address on their website).

  24. Nick December 5th, 2012 6:53 pm

    Whoops managed to garble that. Meant to read:-

    Problem solved after I e-mailed custsvc@dynafit.us (…

  25. Greg December 19th, 2012 4:05 pm

    Hello!

    Any idea if the 2012/2013 Radical ST will come with the pin or without (i.e. will a pin need to be removed for the 2012/2013 Radical ST?

    Cheers

  26. Lou Dawson December 19th, 2012 4:47 pm

    Greg, they all come without the pin now, and with external anti-rotation installed or built-in (as with Speed Radical). Lou

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