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MAXUM AB5 Leg Extension Curl Attachment
$200.00
The MAXUM AB5 Leg Extension Curl Attachment is built to elevate your leg workouts and effectively targets your quadriceps, hamstrings, and glutes.
Made from high quality steel and durable padded cushions, this attachment is designed to integrate seamlessly into your MAXUM AB5 Adjustable Bench thus increasing your workout variety.
With a built-in 12″ weight horn, you can increase resistance and build strength by adding weight plates to the attachment.
Includes extension cables and connection points so you can integrate this attachment with your functional trainer’s weight stack for a more consistent resistance curve.
- Description
Description
FEATURES
- Variable leg extension and leg curl roller positions
- 12" loadable weight peg
- Works with functional trainer cables
- Closed-cell foam, single stitched high-grade vinyl rollers
- Heavy gauge steel construction
- 45 x 45 mm tube
- Attaches to :
- MAXUM AB5 Adjustable Bench (sold separately)
SPECIFICATIONS
| Packed weight: | 32 lbs |
| Packed dimensions: | 40" x 23" x 6" |
5 reviews for MAXUM AB5 Leg Extension Curl Attachment
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Love It!
Below is my full breakdown.
Compatibility & Modification
The AB5 comes with a 45mm attachment sleeve, but the REP Nighthawk uses 40mm. To make it compatible, I:
Cut off the original 45mm receiver
Welded on a clean piece of 40mm box section
Repainted and fitted it to the bench
The photos above show the welds, the sleeve retrofit, and the finished integration. The mod was straightforward if you have basic metalworking ability. Once attached:
Zero wobble
Perfect alignment
Bench stays completely stable
This adaptation alone makes the Maxum attachment a very cost‑effective alternative to REP’s own offering.
Performance
Once mounted, the AB5 performs far better than expected for the price point:
✔ Smooth Movement
The rotation arms and bushings glide smoothly with no grinding or unevenness. Even with multiple plates loaded, the motion feels consistent and controlled. For leg curls and leg extensions, the range of motion is excellent.
✔ Good Ergonomics
The roller pad spacing works well for both movements.
Bench height lines up nicely for both seated extensions and lying / prone curls.
The adjustment knob and locking pin feel solid once engaged.
✔ Stable Under Load
With weight plates added, the whole setup remains planted and stable. Using it with cable resistance (from a functional trainer) also works extremely well—the pulleys track straight and tension feels balanced.
Build Quality
Maxum doesn’t use the heaviest gauge steel, and you can tell compared to premium brands, but:
The construction is still structurally sound
Welds are functional (and in my case, improved with the modification)
Finish is clean with no sharp edges
Foam rollers are dense and durable
Chrome weight pegs feel solid
For the price, the materials are more than acceptable, and definitely better than most budget-brand attachments.
Value
This is where the AB5 really shines.
REP’s dedicated leg curl/extension attachment is significantly more expensive. The Maxum version—especially if you already have a Maxum‑compatible bench—is a fraction of the cost, and with the 40mm sleeve retrofit, it becomes a highly affordable upgrade for REP bench owners.
Considering the performance, smoothness, and versatility, it’s one of the best bang‑for‑buck lower‑body attachments I’ve tried in a portable bench‑mounted format.
Pros & Cons
Pros
Excellent value for the money
Smooth and consistent movement
Works extremely well after 40mm mod
Comfortable and well‑sized rollers
Stable under load
Compatible with plates or cable systems
Great combination for hybrid home gyms
Cons
Steel gauge is lighter than premium brands
Requires modification for REP benches
A bit bulky to store when not attached (like all similar attachments)
Final Verdict
If you’re willing to do a simple modification—or already own a Maxum bench—the Maxum AB5 leg extension / leg curl attachment is a standout performer and a highly cost‑effective alternative to REP’s proprietary option.
Smooth, functional, and budget‑friendly.
Once adapted, it integrates beautifully with the REP Nighthawk bench and feels like a custom solution at a fraction of the cost.
A fantastic addition to a home gym, especially for lower‑body isolation work.
-leg extension
-leg curl
Il est facile d’utilisation.
Deux types de poids peuvent être utilisés. Des plaques ou des anneaux sur l’accessoire permettent même dʼutiliser les poulies basses dʼune station d’entraînement tel que la S-150 en guise de poids.