We get tons of emails and blog comments asking about Dynafit bindings boot length adjustment range and screw patterns. Instead of acting like a lame college professor giving a cloned lecture dozens of times a year, I thought I’d stick the essentials in a blog post (and make sure they’re in our Dynafit Binding FAQ), so here goes Part Two in “A Week of Dynafit.”
Dynafit TLT Speed heel unit base.
Photo above shows for/aft boot length adjustment mech for the timeless classic Dynafit TLT Speed. Range is 6.4 millimeters. Mondo boot sizing is done in centimeters, so range of this binding is around 1/2 size Mondo. Thus, consider TLT for/aft adjustment to be more for tuning to a given boot than for swapping various size boots.
A later version of this is the Speed Radical, which has a boot length adjustment range of 23.8 millimeters. About 2 mondo sizes and a bit more useful for running different boots without remounting the binding.
Dynafit Vertical/Comfort base plate underside.
Photo above, Dynafit TLT Comfort and Vertical ST/FT models base plate. For/aft adjustment range 25 millimeters, or around 2 1/2 Mondo sizes.
The Comfort and Vertical models led up to the Radical ST/FT, which as the same adjustment range, caliper measured at 24.67 millimeters.
TLT Vertical Rental, heel base underside.
Photo above, TLT Vertical Rental rear base plate, 61 mm adjustment range, or around 6 Mondo sizes.
Now about those screw patterns.
Dynafit binding toe units use several different screw patterns. Mainly, the Radical toes only use 4 screws with the front two mounted farther ahead.
Comfort, Vertical and Radical series bindings all use the same heel hole pattern.
Most of the lighter weight heels (such as the race units) use a tighter heel hole pattern and may require machinist level mounting skills if they have no for/aft adjustment.
The rental bindings have their own unique heel hole pattern because they’re much longer.
Dynafit Lite/Race base to left, TLT Speed to right.
Any questions, class?
WildSnow.com publisher emeritus and founder Lou (Louis Dawson) has a 50+ years career in climbing, backcountry skiing and ski mountaineering. He was the first person in history to ski down all 54 Colorado 14,000-foot peaks, has authored numerous books about about backcountry skiing, and has skied from the summit of Denali in Alaska, North America’s highest mountain.
