Kratos Flywheel - Dual-Axis Inertial Training


Click the image above to learn more about Kratos! This product page contains basic information, to get the full experience you'll want to visit the Kratos page. If you have any questions about the Kratos, use the red support button below to reach our customer service team or submit a question via the grey "Question" button above. 



  • Lead Time: Kratos ships the week of July 19
  • Simple Financing Available Through Klarna available at checkout, learn more below.
  • Wall mount version ships in 2 boxes, rack mount version ships in 1 box.
  • All accessories including selected belt ship separately.
  • Setup, assembly, and troubleshooting video instructions sent via email.



  1. Wall Mount OR Rack Mount Bracket (choose one)
    1. Wall Mount includes tube, wall mount anchor, and remote anchor loader.
    2. Rack Mount includes standard 3" hole spacing rack mount anchor, remote anchor loader, and deck anchor. Compatibility Details
  2. Belt Squat Belt OR Front Squat Harness by  Spud (choose one) (sizing)
  3. FREE Angles 90 Grips
  4. Medium and XL Flywheels (purchase more here)
  5. FREE 6 months of access to Kabuki Education's Video Library
    1. Kratos Exercise Videos

Clicking add to cart will prompt you to select additional Kratos accessories and tools. They can also be viewed as a collection here.



We have happy to offer simple financing through our partner bank Klarna. To take advantage of this payment option, simply select it at checkout. Learn more here.

Option 1: Pay in 4 interest-free installments

Option 2: Traditional 6 or 12 mo financing. A 0% interest * option is available when order is paid in full within 6 or 12 months, pending approval. 


* Interest will be charged from transaction posting date at 19.99% APR if not paid in full by end of 6 or 12 month promo period.


 More information on the Kratos product page.



Hypertrophy Training

There are many pathways and strategies for stimulating muscle hypertrophy. Of them, mechanical tension, total volume, and metabolic stress are the primary catalysts. The Kratos excels at stimulating metabolic stress under high mechanic tension making it an unconventional yet effective tool for hypertrophy training. The Kratos may be used as a standalone device however it can be a formidable 1:2 punch when combined with traditional barbell, dumbbell or machine training. Traditional methods of training emphasize concentric muscle load to produce an overloading hypertrophy stimulus whereas the Kratos provides an overloading eccentric muscle load. Combining these two types of muscle loads will provide a much greater stimulus than if you were to target a single type.


Sport Specific Strength Training

One unique application of the Kratos is in grappling sports such as wrestling, and the various subdivisions of MMA. Combat sports require athletes to resist movement of an opponent. At the physiological level this movement resistance is translated as isometric/eccentric muscle load. Resisting the force of an opponent can be simulated on the Kratos through the overloading action of the flywheel. In practical terms the stored energy in the flywheel feels like a constant force pulling on your body while you are performing exercises. This is far different than a standard cable machine or free weight implement where the load is static.

An emerging area of study for eccentric overload training is teaching movement deceleration. Deceleration is a primary component to agility and change of direction for field sport athletes. The Kratos may also influence post activation potentiation (PAP) by providing a significant neural response during eccentric overload. Overloading this phase of movement may prime the nervous system before jumping, bounding, or doing other explosive type exercises. This neural priming allows users to express greater power output when external load is removed.



The ability to change the intensity of the Kratos without having to switch between different machines, bars, or weights makes it a perfect candidate for applying time under tension training techniques. By using variable load management, you can effectively perform very hard total body exercises over a longer period of time. To do this with traditional implements you would need to combine different dumbbells, bars, or machines to effectively scale load. The benefit of the Kratos is the ability to sustain continuous work without taking time to transition to different implements or weights. This will lead to higher training density which should be a primary goal of anyone who wants to improve their conditioning. Greater training density ultimately means your time in the gym will be spent efficiently.


Rehabilitation and Recovery

When it comes to exercise intervention during rehab and recovery scaling load is one of the first variables strength coaches and clinical experts will adjust. A unique advantage the Kratos has is letting the user adjust load based on effort and how challenging they feel the stimulus is. This is more of an agile approach to scaling exercise load than traditional fixed training implements such as barbells and dumbbells. Specific case studies involving lower back injuries show benefit of the Kratos to re-introduce load by limiting the total axial force through the spine. Other unique strategies include reintroducing load to tendons without relying on excessive amounts of concentric muscular action. Because the Kratos overloads the eccentric portion of movement users are able to target connective tissues post injury with much higher eccentric loading than would be possible with barbells, machines, or dumbbells.



Rack Mount Compatibility


The rack mount version of Kratos fits most standard racks with the following common characteristics. If you are unsure about fitment, please email our customer service team via the red button below.


  • Standard 3" square tube rack
  • Standard 2" hole spacing
  • Standard 5/8" hole diameter
  • Unobstructed base


 Belt Squat Sizing


  • Small (45" long, 3.5" wide)
  • Medium (45" long, 5.5" wide)
  • Regular (54" long, 5.5" wide)


Front Squat Harness Sizing


  • Small (80-150lbs)
  • Large (150-225lbs)
  • XL (225-325lbs)
  • XXL (350lbs +)



    Clicking add to cart will prompt you to select additional Kratos accessories and tools.

    Click here to load full lineup of Kratos accessories and attachments in a new page.  

    Click here to purchase additional flywheels.


    Customer Reviews

    Based on 1 review Write one!


    Ask a Question
    • What warranty does the Kratos include?

      12  month limited warranty, not including wear items (bearings, straps, pulleys). Does not include warranty against any cosmetic blemishes that could result from regular use or damage from misuse.

    • What is the inertia per wheel measured in KG squared?

      XL (11.94lbs) = 0.0617
      L (8.3lbs) = 0.0297
      M (5.88lbs) = 0.0149
      S (4.16lbs) = 0.0074
      XS (2.65lbs) = 0.0066

    • Do you have any stores in Seattle that demo the Kratos? I'm interested in purchasing but would like to use it first. Alternatively, are there returns if I'm not satisfied?

      Unfortunately, we do not have any brick and mortar stores that carry the product.  In order to return the product for a non-manufacturing issue, you would need to pay return shipping and as long as it arrived in good condition, you would be refunded for the cost of the product.

    • Still very confused about the wallmount vs rack mount. A good majority of people have 3x3 racks with 1 inch holes spaced 2 inches apart. A lot of people will also not want to drill into the wall. For these people which model would be most versatile in terms for strapping to the rack or to a pole? Can the wall mount be used against the rack or a pole?

      The wall mount is the most versatile, since it can be used on any rack, or on a pole, or taken with you.  All that's needed is a set of ratchet straps.

    • Is it possible to demo a Kratos unit?

      Unfortunately, at this time it is not possible to demo a Kratos unit.  We apologize for any inconvenience.

    • Has there been any thought to make the base at the end opposite the the flywheel beveled? The bevel would allow a greater mechanical advantage when performing rows and horizontal presses. I have been doing these exercises for years with Free Motion cable cross and functional lift. The ability to brace the foot and or feet allows significantly more stability which if I understand how the resistance of the flywheel feels would be a great training feature.

      There has been some thought into adding an option to allow the user to elevate the foot.  Provisions have been made in the design to add an attachment that can accommodate that kind of functionality.  Thank you for sharing the idea...  Stay tuned

    • Any plan for developing a monitor?

      There are no plans for a monitor at this time.

    • Greetings, I am confused with the wall or rack options. Which of the two brings you the tube and the base? Is there an option to put a longer tube for people who are more malt? Is there a way to tie the cable to a barbell so that I can bench press? Thanks

      Selecting the wall mount provides the separate tube that attaches to the wall.  There is not a current option for a longer tube at this time.  It is possible for you to create a harness to allow a bench press. Our recommendation is to perform a single-arm press standing up. 

    • Do you have a picture of a rack mounted kratos?

      The product is so new that we don't have a ton of pictures yet, but they are coming.  Until then, here is a video of Chris explaining how to use the Kratos on the rack mounted unit;

    • How many wheels can be loaded and what size are the wheels

      It will handle 4 plates and is expandable to 8. 

      Size (Weight) Inertia (kg*m^2)

      XL (11.94lbs) = 0.0617
      L (8.3lbs) = 0.0297
      M (5.88lbs) = 0.0149
      S (4.16lbs) = 0.0074
      XS (2.65lbs) = 0.0066

    • What are the platforms dimensions?

      The platform measures 48" x 34"

    • Is there any way to mount it on a 2x3 rack upright?

      It's possible to mount on the 3" side of the rack, if the spacing is 2" and the pin size is 5/8".

    • Will the rack mount work with the Rep Fitness Power rack 5000 v2? (1 inch holes)

      Unfortunately, there is not currently an option for a rack with 1" hardware.  

    • With rehab can you use bfr training in conjunction with the unit or is it too intense?

      The Kratos offers an absolutely incredible interface with BFR and will work in a rehab setting, as well.  Because the weight is based on user effort input, it ends up being self-regulating and will keep the intensity in check.  If concerned, use a subjective measure of effort on either a 1-5 scale or the common RPE (rate of perceived effort) 1-10 scale.  A simple tool is RIR (reps in reserve) leaving say, 3 or 5 reps left in the tank, for example. 

      Live Better Through Strength

      Chris Duffin

    • So I'm confused about wall mounted vs rig. The picture shows a self sustainable system

      The wall mount option is a self-sustainable unit that relies only on a wall or post to secure the wall mount.  The rig mount is intended for those that have an existing 3x3" rack with 5/8" hardware.  If you're in doubt I suggest that wall mount. 

    • What is the minimum vertical clearance for either mount option? Will this work in 80” or lower ceiling space?

      Minimum clearance for the wall mount is 75".  The rack mount will work on any height that you can fit the rack into.  80" is enough room for the wall mount. 

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