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 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 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.
Dynafit supplied Radical anti-twist installed 5 minutes later.
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. 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 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. 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.
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.
Maruelli heelpiece installed on brake.
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 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.
Joseph Risi was raised on pasta and meatballs in the “backwoods” of Long Island before seeking higher education in the mountains of Vermont. Always looking for adventure, building treehouses, working too many odd jobs around the world he now lives in the Aspen area of Colorado.
