Leg extension and leg curl weight by brand: stacks, increments and what the pin means

What the number under the pin means on a leg extension or a leg curl

The stack weight is the total of the plates in the stack, and the number under the pin is how many of them you lift. On a leg extension or a leg curl you do not hold the cable: the stack turns a lever arm around your knee, and you push on a roller pad against your shin or your heel. The cam or pulley between the stack and the arm, and how far down your leg the pad sits, change the effort a given pin asks for at every point of the movement. Friction makes lifting a little harder and lowering a little easier.

So the same pin number on two brands, or on a seated, lying, kneeling and standing leg curl of the same brand, is not always the same load. Set the pad and the knee axis as the manufacturer's placard says before you compare settings.

Converting a load between two of these machines needs a force curve for both. None has one yet, so the comparator answers "No data yet" for every pair.

Selectorized leg extensions, brand by brand

Stack weights and, where the manufacturer publishes it, the weight increment, quoted word for word with the link and the date we read it. When a machine lists more than one stack, the manufacturer's own label under each row says which one it is (for example a standard and a heavier option).

Arsenal Strength

Atlantis Strength

Cybex

Exigo

gym80

Hammer Strength

Hoist Fitness

Life Fitness

Matrix Fitness

Nautilus (commercial)

Panatta

Precor

Technogym

Watson Gym Equipment

Most manufacturers do not state the increment between pins on their product page; where no increment row is shown, it is not stated (no data yet).

No data yet Brands in the catalog without a selectorized leg extension (no data yet):

Prime Fitness

Selectorized leg curls, brand by brand

Seated, lying (prone), kneeling and standing leg curls are listed under their own names, because their stacks often differ even within one brand. Each value is quoted with the link and the date we read it.

Arsenal Strength

Atlantis Strength

Cybex

Exigo

gym80

Hammer Strength

Hoist Fitness

Life Fitness

Matrix Fitness

Nautilus (commercial)

Precor

Technogym

Watson Gym Equipment

Most manufacturers do not state the increment between pins on their product page; where no increment row is shown, it is not stated (no data yet).

No data yet Brands in the catalog without a selectorized leg curl (no data yet):

PanattaPrime Fitness

Pin setting versus the load on your leg

No data yet No leg extension or leg curl has an estimated or measured force curve yet, and none has a mechanical model yet (no data yet). Until one is measured, compare these machines by feel: start light on a new brand and work up.

Plate-loaded leg extensions and leg curls

No stack here: you load plates on a lever arm. What the manufacturer may state is the starting resistance of the empty arm and the maximum plate load, quoted below with the link and the date.

No data yet Plate-loaded leg extensions and leg curls whose manufacturer states neither a starting resistance nor a maximum load (no data yet):

Exigo Lying Leg CurlExigo Plate Loaded 2.0 ISO Leg ExtensionExigo Plate Loaded 2.0 ISO Standing Leg CurlExigo Plate Loaded 2.0 Leg Extensiongym80 Pure Kraft Standing Leg ExtensionLife Fitness Plate Loaded Leg ExtensionNautilus (commercial) Leg ExtensionNautilus (commercial) Lying Leg CurlPrime Fitness Leg ExtensionPrime Fitness Prone Leg Curl

How every figure is labelled

MachineConvert never invents a number. Each figure carries one of three levels, with its source link and the date it was read:

Measured

Read on the machine itself with a force gauge, following the measurement protocol, with a proof (continuous video or photos) and the date.

Manufacturer

Quoted word for word from the manufacturer's official page or document, in the units printed there, with the link and the date it was read. A stack weight says what the plates weigh, not what you feel at the handle.

Estimated

Computed from a mechanical model of the machine (lever, cam or pulley) built from sourced inputs. Each estimate shows its method, its error band and a derivation page, and is marked as not verified by measurement.

MethodologyData rules

Help fill the gaps

If you train on one of these machines and have a force gauge or a luggage scale, a measurement is the fastest way to turn "No data yet" into a real comparison. Every submission is reviewed before it is published.

Share a measurementOpen the comparatorAll brandsCoverage by machine group

Leg extensions in the catalog

Arsenal Strength M-1 Selectorized Leg ExtensionAtlantis Strength Leg extensionCybex Eagle NX Leg ExtensionCybex Prestige Strength VRS Leg ExtensionExigo Leg ExtensionExigo Plate Loaded 2.0 ISO Leg ExtensionExigo Plate Loaded 2.0 Leg Extensiongym80 Leg Extensiongym80 Pure Kraft Standing Leg ExtensionHammer Strength Iso-Lateral Leg ExtensionHammer Strength MTS Iso-Lateral Leg ExtensionHammer Strength Select Leg ExtensionHoist Fitness Leg ExtensionLife Fitness Axiom Series Leg ExtensionLife Fitness Insignia Series Leg ExtensionLife Fitness Plate Loaded Leg ExtensionMatrix Fitness Ultra Leg ExtensionNautilus (commercial) Impact Leg ExtensionNautilus (commercial) Inspiration Leg ExtensionNautilus (commercial) Instinct Leg ExtensionNautilus (commercial) Leg ExtensionPanatta Leg ExtensionPrecor Leg ExtensionPrecor Leg ExtensionPrime Fitness Leg ExtensionTechnogym Artis Leg ExtensionTechnogym Pure Strength Leg ExtensionTechnogym Selection 900 Leg ExtensionWatson Gym Equipment Single Stack Leg Extension

Leg curls in the catalog

Arsenal Strength M-1 Selectorized Lying Leg CurlArsenal Strength M-1 Selectorized Standing Leg CurlAtlantis Strength Leg Curl MachineAtlantis Strength Lying leg curlAtlantis Strength Standing leg curlCybex Eagle NX Leg CurlCybex Prestige Strength VRS Prone Leg CurlCybex Prestige Strength VRS Seated Leg CurlExigo Lying Leg CurlExigo Lying Leg CurlExigo Plate Loaded 2.0 ISO Standing Leg CurlExigo Seated Leg CurlExigo Standing Leg Curlgym80 Lying Leg Curlgym80 Pure Kraft Standing Leg Curlgym80 Seated Leg CurlHammer Strength Iso-Lateral Kneeling Leg CurlHammer Strength Iso-Lateral Leg CurlHammer Strength MTS Iso-Lateral Kneeling Leg CurlHammer Strength Select Leg CurlHoist Fitness Leg CurlHoist Fitness Prone Leg CurlLife Fitness Axiom Series Leg CurlLife Fitness Insignia Series Leg CurlLife Fitness Insignia Series Seated Leg CurlLife Fitness Plate Loaded Kneeling Leg CurlMatrix Fitness Aura Seated Leg CurlMatrix Fitness Magnum Kneeling Leg CurlNautilus (commercial) Impact Kneeling Leg CurlNautilus (commercial) Impact Leg CurlNautilus (commercial) Impact Seated Leg CurlNautilus (commercial) Inspiration Leg CurlNautilus (commercial) Instinct Leg CurlNautilus (commercial) Lying Leg CurlPrecor Leg CurlPrecor Prone Leg CurlPrecor Seated Leg CurlPrecor Seated Leg CurlPrime Fitness Prone Leg CurlTechnogym Artis Leg CurlTechnogym Pure Strength Standing Leg CurlTechnogym Selection 900 Prone Leg CurlWatson Gym Equipment Single Stack Lying Leg CurlWatson Gym Equipment Single Stack Seated Leg Curl

Related guides

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