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Louis Garneau T-Flex LS -100 Men's Shoes

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Item # LGN0919

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  • Black, 38.0 ($137.47)
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Item # LGN0919

Conquer the trail.

Being entirely frank, it's rare that a road-focused manufacturer successfully makes headway in the mountain market. Note that we said 'rare' and not never. Not surprisingly, Louis Garneau is among the elite few that designs equally across disciplines, as is reflected with its new T-Flex LS-100 Shoes.

Starting at the outsole, Garneau sought to achieve the perfect balance between strength, rigidity, and weight. Are you thinking carbon fiber? So were we. However, the T-Flex utilizes Garneau's Carbon T-Flex Power Blade -- a carbon-reinforced nylon with a removable carbon plate under the arch of the foot. Why have a removable carbon blade? Well, it increases stiffness, but when the temperature rises, its removal exposes a staggered four-vent port that cools the foot. This means that you gain both the stiff benefits of carbon fiber, the controlled flex of a nylon matrix, and optional cooling at the hottest part of the foot. But in terms of rigidity, what does this really amount to? Well, coupled with the LS-100's low stack height, the T-Flex's composition and rigidity equate to a direct transfer of power to the pedals. Just like in frame design, the outsole has a stiffness-to-weight ratio that positively promotes an efficient carry of power with limited energy dispersion. So, in simpler terms, these outsoles make your hard efforts count in relation to speed.

In terms of the aforementioned flexibility, you've surely felt berated by overly stiff outsoles at some point in your riding. The nylon matrix of the Ergo Air IIs amounts to a calculated percentage of 'give' under load. Essentially, this is minute enough that you won't notice it on climbs or hard drives, however, after a few hours on the trail, your feet certainly will. Comfort without the penalty of weight is the design philosophy at work here.

And speaking of weight, the LS-100 tips the scales at a lower weight than many other manufacturer's top offerings -- 320g per shoe. This is credited, in one part, to the outsole, but in our opinion, more so to the lightweight upper construction. This has been constructed from a synthetic leather with mesh ventilation windows along the side of the shoe and over the entire tongue. This means that durability is guaranteed without the risk of the adaptive long-term deformity that plagues natural leather uppers. More importantly, though, a bulk of the weight reduction is a result of the LS-100's closure system. At the toe box, you'll find a single hook-and-loop strap that controls the lower volume of the shoe. Meanwhile, and a first for us at this price, the venerable BOA L4 single rail controls the retention at the top of the tongue. If you hadn't noticed, BOA is highly selective as to who it chooses to license to, and that this technology is featured in a mountain shoe is, well, nearly unheard of. Essentially, the L4 buckle provides the most even, forgiving, simple-to-use, and precise retention on the market. With a simple quick turn of the dial, your retention is secured and unwavering.

However, even with all of the above, Garneau wasn't done yet. To prevent the power-sapping effects of heel slippage, the LS-100 features Garneau's HRS-90 technology. Basically, this is a reinforcement panel that cups the heel from the inner and outer points of the outsole, forming a 'band' over the heel. As admittedly basic of a design this is, it works very well at maintaining the secure position of the heel.

Don't think that Garneau forgot about the outsole tread, either. The T-Flex features a dual-density polyurethane tread that's actually been shaped in mimic of crampons. Ultimately, this combination of shape and materials creates a tread that's durable, and just as importantly, effectively sheds mud.

The Louis Garneau T-Flex LS-100 Shoes area available in even sizes from 38.0 to 50.0 and in the colors Black and White. Please note that these shoes are only compatible with two-hole SPD cleat systems, and that they include a pair of both Garneau COOLMAX Ergo Air Cool Stuff Blue and Hot Stuff Red insoles.

  • T-Flex Power Blade-reinforced nylon sole
  • Synthetic uppers with mesh ventilation
  • HRS-90 heel cup
  • Polyurethane tread
  • Boa L4 dial and hook-and-loop strap retention system

Tech Specs

Upper Material:
[upper] microfiber, [ventilation panels] mesh
Boa L4
Ergo Air Cool Stuff, Ergo Air Hot Stuff
Carbon T-Flex Power Blade
Cleat Compatibility:
Claimed Weight:
[size 42] 320 g
Manufacturer Warranty:
1 year

Size chart

Fuji Bicycles


Geometry Chart


Altamira LTD

Seat Tube


Effective Top Tube








Head Tube


Head Tube Angle


Seat Tube Angle


Bottom Bracket Drop


Chainstay Length



44 44.0cm 51.5cm


36.3cm 72.1cm


72.0 deg 75.0 deg 6.9cm 40.5cm 97.1cm
47 47.0cm 53.0cm


37.0cm 74.1cm 13.0cm 72.5 deg 74.5 deg 6.9cm 40.5cm 97.7cm
50 50.0cm 54.5cm 54.0cm 37.0cm 76.0cm 14.0cm 73.0 deg 73.5 deg 6.9cm 40.5cm 97.6cm
53 53.0cm 56.0cm 56.0cm 37.9cm 78.3cm 16.0cm 73.5 deg 73.5 deg 6.9cm 40.5cm 98.6cm
55 55.0cm 57.5cm 58.0cm 38.9cm 80.1cm 18.0cm 73.5 deg 73.5 deg 6.9cm 40.5cm 100.1cm
58 58.0cm 59.0cm 60.1cm 39.7cm 82.1cm 20.0cm 74.0 deg 73.5 deg 6.9cm 40.5cm


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Here's what others have to say...


pedal fast

  • Familiarity:I've used it several times
  • Fit:True to size

Its difficult to compare new shoes to 5 year old shoes. That said... these shoes are true to size, stiff with great power to pedal transfer. I like the locking mechanism. They seem a little warmer than my old sidi shoes. overall i like them and will report back after a few more months.


great shoe, super comfortable

  • Familiarity:I've used it several times
  • Fit:True to size

best mountain bike shoe I've owned, nice amount off stiffness and still comfortable to walk in when needed.