NÜOBELL S 5100 Black: Replace 20 Pairs of Dumbbells With One Twist

The NÜOBELL S 5100 Black replaces 20 pairs of fixed dumbbells with two adjustable dumbbells and their included floor cradles. Each dumbbell adjusts from 5 to 100 lb, and switching loads takes a twist of the wrist while it sits docked, keeping pauses short during drop sets and supersets. Our testing team’s first impression held from day one: this feels much closer to picking up a fixed dumbbell from a gym rack than most adjustable designs. Add the optional matching Pylon Floor Stand and the system sits at a more convenient lifting height in the corner of the room.

The core of the design is the twist handle. With the dumbbell docked in its cradle, turn the grip until the required weight lines up. The handle moves through 20 settings in 5 lb increments, locking the selected plates onto the dumbbell while the remaining plates stay in the cradle. Weight changes were the quickest part of our testing, taking only a few seconds between sets with no selector pins to move or separate end dials to adjust. The mechanism combines polymer and metal components, which NÜO says helps keep operation smooth, quiet and low maintenance. The team’s main gripe with the construction sits here: the visible polymer components around the outer mechanism feel less premium than metal would at this price.

What separates the S 5100 from many adjustables is how it behaves in motion. Its thicker plates are secured using stainless steel V-connectors rather than hanging loosely from the handle. During testing, we noticed no meaningful rattling or plate movement, even through rotational exercises and renegade rows. The aluminum handle measures 110 mm long and 32 mm in diameter, and the dumbbell remained well balanced throughout the tested weight range.

Living with the system is where the S-series design earns its keep. The flat-head profile gives it a more conventional shape than many block-style adjustable dumbbells, while the included cradles keep the pair contained at floor level. The optional Pylon Floor Stand is made from powder-coated steel and adjusts from 55 to 64 cm. With the dumbbells loaded, the total listed height ranges from 71 to 79 cm. During testing, it brought the handles to a much more comfortable pickup height and removed the need to retrieve the dumbbells from the floor.

Setup was mostly straightforward. The instructions included in the box were helpful, although the team also used the brand’s installation videos to finish the job. That is not a major issue, but clearer step-by-step printed guidance would make the process easier for first-time owners.

For US buyers, the S 5100 has a 2-year base warranty plus an exclusive 2-year extension when purchased directly from NÜO Athletics, bringing direct-purchase coverage to 4 years. The warranty is limited to residential use and does not cover damage caused by dropping or slamming the dumbbells. NÜO’s global store lists a 2-year warranty, so coverage may differ by country and seller. Even with the direct-purchase extension, the team would have liked stronger protection on equipment positioned as a long-term purchase.

In a small apartment or garage gym, the pair replaces 20 fixed dumbbell pairs without requiring a full storage rack. Each dumbbell reaches 100 lb, giving committed lifters substantial room to progress without replacing the system as their strength improves. The conventional dumbbell profile also helps it feel natural through presses, rows, curls and rotational movements. The 5 lb increments make progression straightforward to plan: warm up light, work through the middle settings and finish heavy using the same pair of handles.

The S 5100 is for the committed home lifter who wants one purchase to cover years of progress and cares about how the weight feels in hand. It sits toward the top of the category on price, and the polymer components and market-dependent warranty terms are fair criticisms. Neither changes what matters most: the broad weight range, quick adjustments and traditional dumbbell-like handling. That combination is what earns the score.