Mammut Smart 2.0 Belay Device

Curated from 79 real Reddit conversations

Refreshed on: April 16, 2025

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Mammut Smart 2.0 Belay Device

Brand: Mammut
Price: $39
Snoop Score:
7.5
Sentiment
7.5
Popularity
9.2
Technical
7.4
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Snoop's Take

The Mammut Smart 2.0 Belay Device is a lightweight and easy-to-operate climbing tool designed for both lead climbing and top rope climbing. Weighing only 80 grams, it features a no-moving-parts design that enhances safety during climbs, as it efficiently blocks the rope in case of a fall. Consumer sentiment surrounding the Smart 2.0 is largely positive, with many users praising its lightweight design and safety features. One user noted, "I prefer the Smart Alpine by a large margin," highlighting its effectiveness compared to other devices on the market. Additionally, the assisted braking feature is appreciated, with users finding that it allows for efficient rope feeding during lead climbing, making the belaying process smoother. Based on user feedback, the Mammut Smart 2.0 is recommended for climbers seeking an efficient and safe belaying device. While it has some limitations regarding rope sizes and the need for a larger belay carabiner, its overall performance and safety features make it a strong choice in its category.

Not for you? Check out our other rated Belay & Rappel Equipment

6mm sounds awfully thin for a glacier rope, but sounds like the cool kids are doing that these days.

Positive Feedback

The downside to the smart is that you need to have a huge belay biner.

Negative Feedback
Product
7.5
Mammut Smart 2.0 Belay Device
Buy on Amazon for $39
Beginner Belaying
4 / 10
Sport Climbing
8 / 10
Trad & Multi-Pitch Climbing
7 / 10
Gym & Top-Rope Training
4 / 10
See how this compares to all Belay & Rappel Equipment

What it does well!

Key strengths users can’t stop talking about.
Lightweight design
“6mm sounds awfully thin for a glacier rope, but sounds like the cool kids are doing that these days.”➕
“Pretty similar to you but I'm trying to minimise weight, so I wouldn't carry - gri gri, gloves, microtraxion”➕
“I would at least ditch the gloves, quicklink, and the grigri.”➕
“Rappel Devices for 6mm Rope? What is/would be your preffered way to rappel on a 6mm rope like the petzl rad line?”➕
No moving parts for safety
“the most common glacier ropes seem to be 6mm and neither of those devices are rated down to 6mm... the ATC guide seems to be the go to choice so i'm confused as to why they aren't rated for the most common ropes.”➕
Suitable for various climbing types
“Atc guide alpine can handle 6mm rope”➕
“I prefer a simpler approach. The vast majority of the time, I do not use cordellettes or extend my rappel.”➕
Easy to operate
“it just takes practice to do it smoothly, just like anything else 🤷🏻‍♀️”➕
Inexpensive but good assisted braking device for single rope
“Mammut-smart (inexpensive but good assisted breaking device for single rope)”➕
Safe when used properly
“No device is going to be more safe or less safe as long it is used in the intended manner.”➕
Preference for Smart over GriGri
“I prefer the Smart Alpine by a large margin.”➕
Assisted braking feature
“'Assisted breaking' to a degree I believe, due to the design of it but not have any moving parts.”➕
“It's a great Swiss-army-knife of belay devices.”➕
Effective assisted braking for belaying
“He kinda takes his hand off the rope, but it's more of sliding it down.”➕
“The feeding action for lead belay is also probably the easiest of any device.”➕
Effective rope feeding on lead climbing
“I like the way it feeds out rope on lead much more, plus you get the benefit of being able to double rope rappel with it.”➕

Where it needs some work!

Areas to watch—feedback on possible improvements.
Requires a large belay carabiner
“The downside to the smart is that you need to have a huge belay biner.”➕
Not suitable for small ropes
“The Petzl device works much better on smaller ropes than the other two, and if you plan on doing any alpine climbing in the future, you're going to want that capability.”➕
Difficulty with grab and slide technique
“Doing the grab and slide technique doesn't really work well since you need to get your hand on the handle.”➕
Difficulty rappelling on longer routes
“Having to lift the device to get the rope to feed through for a full 60 meter rap was just awful.”➕
Clumsy lowering action compared to other devices
“Hows the lowering action? It always seemed clumsy compared to the smart or grigri”➕

Compare On All Talked About Dimensions

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AOKWIT Professional 25KN Rappel ATC Belay DeviceAOKWIT Professional 25KN Rappel ATC Belay Device$15
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Black Diamond ATC-XP Belay DeviceBlack Diamond ATC-XP Belay Device$24
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Petzl GRIGRI + Belay Device with Anti-Panic HandlePetzl GRIGRI + Belay Device with Anti-Panic Handle$89
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Black Diamond Big Air ATC XP Belay Device and Carabiner PackageBlack Diamond Big Air ATC XP Belay Device and Carabiner Package$39
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Black Diamond ATC-Guide Rapel/Belay DeviceBlack Diamond ATC-Guide Rapel/Belay Device$37
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YXGOOD 50KN Rescue Figure 8 DescenderYXGOOD 50KN Rescue Figure 8 Descender$16
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PETZL GRIGRI Belay DevicePETZL GRIGRI Belay Device$99
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WILDKEN Professional Rappel ATC Belay DeviceWILDKEN Professional Rappel ATC Belay Device$12
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Core Power Plays

The specs and strengths that make it shine.
Discussion about rope thickness for climbing
“There is no use for a Grigri.”➕
“I think the most common glacier ropes are 8-9mm.”➕
“Main thing is to test these in a safe spot and making sure you have manageable friction before you’re hanging off a cliff.”➕
“Black diamond atc is rated for minimum 8.1mm, Petzl reverso for minimum 6.9mm... doesn't necessarily mean they won't help on a thinner rope but it might be sketchy.”➕
Discussion about minimizing weight while climbing
“What’s on your harness for multi-pitch? And why? (everything but the pro) Hey trad community! As a ”➕
“The gunks is the most well-manicured trad area in the world, and it's at most 3 pitches long. That's way too much stuff.”➕
“Will not be leaving the ground without a camelback for future multi pitches.”➕
“Besides the hardware recommendations, Super Munter is my preference for 8mm and under.”➕
Discussion about carabiner features
“I'm partial to this carabiner because you don't have to open the gate to move items in/out of the belay loop clip, and the steel insert is sweet.”➕
“Having that part of the carabiner be steel instead of aluminum improves wear life of the carabiner.”➕
“The low-load scenario explanation is what I was looking for, and also very good point about the BD gridlock potentially opening itself in some very edge case scenarios.”➕
Discussion about figure 8 devices for thin ropes
“My Petzl reverso works for rappelling with it if I use two carabiners (as Petzl recommends), but I know Mammut used to make a figure of 8 specifically for thin ropes.”➕
“there is a Edelrid micro jul and a bd atc guide specifically made for thin ropes.”➕
“Second vote for Munter or Supermunter, thinnest rope I've rappelled on is an 8mm static.”➕
“I've rapped on 6 mm cord with plenty of friction settings left to add.”➕
Discussion on the benefits of assisted braking devices
“Can someone tell me why you would use a smart alpine belay device? What benefits does it have vs a regular atc guide?”➕
General discussion about assisted locking devices
“Assisted-locking belay device showdown.. Anyone who ones an assisted locking belay device (grigri, click-up, mega-jul, cinch, etc..), what is your opinion of the device after using it for a while?”➕
Curiosity about device features (twin gate)
“I think the twin gate looks so cool, how do you like it so far?”➕

Hidden Hero Hacks

Unexpected tricks and side‑door uses you’ll love.
Discussion about belay devices for different climbing situations
“Just curious as to the opinions of climbers with more (or less) experience than myself.”➕
“Petzl Reverso on multipitch for belaying in guide mode or if gear is anything less than solid.”➕
“I switch regularly, so I don't get used to one device in particular (nothing worse than being surprised that you don't have assisted breaking, or trying to give out slack and locking up your Gri-Gri).”➕
Discussion about belaying techniques with Smart
“Mammut smart belay technique question”➕
“He's definitely not removing his hand, it's just an artifact of the quick motion in the video.”➕

Buyer’s Cheat Sheet

What to check before you click ‘Add to Cart.’
Discussion about switching from ATC to other belay devices
“Personally I use the Jul 2 simply because I got a great deal for one.”➕
“i switched from atc to atc pilot because of a she moves mountains trip where they required (and provided) pilots specifically and i loved how similar it was to the atc.”➕
“Giga Jul is the answer. I trained with ATC and the switch is smooth and intuitive.”➕
Discussion about local climbing gear inventory
“A local outdoor shop is planning to start selling climbing gear. They asked me what they should sell.”➕
“They should talk to their local Black Diamond sales rep to see what they think is appropriate for the area.”➕
Comparison to other belay devices like GriGri and ATC
“Not like decking would have been fatal or anything but still, awesome performance compared to a regular tube style ATC.”➕

Cautionary Callouts

Know the pitfalls before they catch you off guard.
Preference for Grigri over tube style
“I am passionately team Grigri, and many of the people who I climb with are too. Sure, it's "more ann”➕
“Grigri is the way. Once you develop some muscle memory to feed out slack you won't notice the difference:)”➕
“Grigri. Other devices are useful for specific things but for like 99% of situations, a grigri is all around better.”➕
“My preference would be the DMM pivot. It’s the same device but lowers much easier while in guide mode.”➕
Discussion about various belay devices and their effectiveness
“The Smart sucks ass to rappel on.”➕
“I think the Guide handles fatter ropes better.”➕
“the Smart Alpine and Reverso are two completely different devices, so you should look into that.”➕
Debate on safety of GriGri vs Smart
“How much safer is a GriGri vs a Mammut Smart, Jul2, MegaJul etc?”➕

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