Selectorized Seated Leg Extension & Leg Curl Machine w/ 250lb weight stack (New)

The SFE Selectorized Seated Leg Extension & Leg Curl Machine w/ 250lb weight stack combines two of the most biomechanically effective lower-body isolation movements into one heavy-duty, compact machine - giving you the ability to isolate and overload both quads and hamstrings in a single footprint.

Key Features & Adjustability:

• Fully adjustable back pad moves forward and backward to fit a wide range of users, tested on users as short at 4'10" and as tall as 6'10"!
• Extended seat pad and additional back pad position stops to better accommodate taller lifters and those with longer legs.
• Leg roller movement arm with 9 starting positions, plus leg roller adjustment with 5 positions, for dialing in perfect setup on both movements.
• Knee / thigh pad adjustment with 8 secure starting positions for seated leg curls, plus comfortable rubber grip handles for added stability.
• Laser-engraved numbering on the movement arm, roller, and thigh pad for easy, repeatable position recall.

These adjustments allow you to train both movements through a full or partial range of motion, depending on your body type and training goals.

Performance & Build:

With a smooth, consistent tension curve and heavy-duty construction, this machine delivers commercial-grade feel and performance. Textured rubber grips on both movements provide security and comfort through even your heaviest sets. Every machine ships with the maximum-capacity 250lb weight stack at a 1:1 pulley ratio, giving you all the resistance you need right out of the box.

Compact Footprint:

Despite its versatility and heavy-duty build, the machine fits easily into a home gym or training studio and delivers big gym functionality in a manageable footprint. (See dimensions panel in the photo gallery for minimum and maximum dimensions across all positions.)

Key Features:

• Dual Functionality: Supports both leg extensions and seated leg curls for a complete lower-body workout.
• Selectorized Weight Stack: Easily adjust resistance with a simple pin system for quick weight changes.
• Adjustable Design: Accommodates different user heights and exercise preferences.
• Durable Construction: Heavy-duty steel frame with a sleek finish ensures long-lasting performance.
• Ergonomic Comfort: High-quality padding reduces strain and enhances comfort during use.
• Compact Footprint: Ideal for home gyms or commercial spaces, offering maximum functionality in minimal space.

Take your leg day to the next level with the SFE Seated Selectorized Leg Extension & Leg Curl Machine—engineered for comfort, convenience, and exceptional results!

• Machine Size (LWH): 51.18 inches x 38.58 inches x 61.02 inches
• Packing Size: 62.99 inches x 27.56 inches x 17.72 inches
• N.W. (Net Weight): 403.45 pounds
• G.W. (Gross Weight): 463.04 pounds
• Main Tube 1: 1.97 inches x 3.94 inches x 0.098 inches
• Main Tube 2: 1.97 inches x 2.95 inches x 0.098 inches

Is this commercial quality or residential quality?

Our products are 100% commercial grade and are in use in many boutique commercial gyms across the US. By making combo machines and sticking to the steel, we keep the cost low and make it affordable for residential users.

Can I add additional weight to the machine?

No, our machines are at maximum but you can add accessories to increase weight or resistance.

How do I maintain this machine?

Our machines need very little maintenance. We recommend white lithium grease to lubricate the moving parts on an as needed basis (based on usage). Once per year we recommend re-tightening all the bolts to prevent unnecessary wear & tear.

At Sports & Fitness Exchange, we design our frames in-house, cut and form the steel with precision CNC machines, weld every joint using robotic welders for consistency, then clean, coat, assemble, and inspect each unit before it leaves our facility.

SFE's Robotic Welder's at work!

1. Design & Engineering

• Our team starts by designing each piece of equipment to meet commercial gym standards for strength, safety, and ergonomics.
• We model the equipment in CAD software to dial in dimensions, hole spacing, angles, and load paths.
• Every design is reviewed for:
  • Structural integrity under heavy loads
  • Smooth user experience (range of motion, handle position, etc.)
  • Compatibility with common attachments and accessories

2. Precision CNC Cutting & Forming

Once a design is approved, we move into production using CNC (Computer Numerical Control) machines:

• Steel tubes and plates are cut to exact length and shape by CNC equipment.
• Hole patterns (like rack uprights) are drilled or punched with extremely tight tolerances, so:
  • J-cups, safeties, and attachments fit cleanly
  • Left and right sides line up perfectly
• CNC forming/bending ensures consistent angles and alignment from one unit to the next.

This level of precision is what gives SFE equipment its “everything just fits right” feel.

3. Robotic Welding for Consistency & Strength

After the parts are cut and formed, they move to our robotic welding cells:

• Robotic welders follow the same programmed path on every frame or component, creating:
  • Consistent weld penetration
  • Even, repeatable bead patterns
• Critical joints and stress points are welded for long-term durability, especially on:
  • Uprights and crossmembers
  • Base frames
  • High-load connection points (e.g., weight stack housings, lever arms)

Using robotic welding reduces variation from piece to piece and helps ensure that your rack is built the same way as a rack in a busy commercial gym. Sports & Fitness Exchange

4. Surface Preparation & Coating

To protect the steel and keep your equipment looking good for years:

• Parts are cleaned and prepped to remove oils, residue, and surface contaminants.
• Components receive a durable, corrosion-resistant finish (such as powder coating), designed to:
  • Resist chips and scratches in real-world gym environments
  • Stand up to chalk, sweat, and frequent use

Branding elements, labels, and decals are applied after coating where applicable.

5. Final Assembly & Quality Control

In the final stage:

• Hardware, bushings, bearings, pads, rollers, and weight stacks (where applicable) are installed.
• Moving parts are tested for:
  • Smooth motion
  • Proper alignment
  • Noise and friction issues
• Each unit goes through a quality control checklist before it’s cleared to ship.

If it doesn’t meet our standard for commercial use, it doesn’t go out the door.

Why This Manufacturing Process Matters to You

Because of our CNC and robotic welding setup, we’re able to:

• Build commercial-grade equipment that’s suitable for private and boutique gyms
• Maintain tight quality control from raw steel to finished product
• Keep production efficient so we can offer lower prices than many traditional commercial brands Sports & Fitness Exchange

That’s how we’re able to offer heavy-duty racks, rigs, and machines at pricing that works for home gyms, garage gyms, and growing training facilities.

FAQ: SFE Manufacturing

Do you really use the same processes for home-gym equipment as commercial gyms?
Yes. Our SFE-branded equipment is built to commercial standards, which is why it’s popular with private training facilities, boutique gyms, and serious home lifters.

What kind of steel do you use?
We use commercial-grade steel tubing and plate, sized appropriately for the load and application (for example, uprights vs. crossmembers). The exact specs can vary by model, but everything is chosen for long-term durability.

Where is SFE equipment made?
Our SFE manufacturing process is managed through our facility and partners to ensure consistent CNC cutting, robotic welding, and finishing before the equipment ships to you.

Why is SFE equipment more affordable than other commercial brands?
By controlling more of the production process and focusing on efficient manufacturing (like CNC and robotic welding), we can keep costs down without cutting corners on quality

SFE machines are heavy-duty, commercial-grade equipment designed for serious training, and they require proper tools and at least two people for assembly.

They arrive in wooden crate on a pallet. Our machines are built for heavy duty use and demand time and effort to set up correctly. We provide detailed assembly manuals for every model, but please be prepared for the process.

Although the majority of our customers are able to assemble the machines themselves, if you are not experienced with equipment that involves bearings, guide rods, weight stacks, and/or heavy frames, we strongly recommend hiring a local fitness equipment technician.

Companies such as Fitness Machine Technicians typically charge $200 to $400 per machine, which can save you 2 to 6+ hours, depending on your tools and experience.

Please note that we do not offer assembly services outside of the Phoenix metro area, as hiring locally is usually faster and more cost-effective, and we prefer to pass those savings on to you!