Dumbbell to Barbell Converter Guide: Fit, Bars & Compatibility

A dumbbell to barbell converter clamps onto the handle of a dumbbell you already own, then slides onto a barbell bar so the dumbbell works as a weight plate. This guide explains how to check fit, which bars work, and which dumbbells are compatible — using Dualbell as the reference converter.

What a converter does

Dualbell is a patented dumbbell to barbell converter made in the USA. It secures around a dumbbell handle, slides onto a standard bar, and locks in place with a standard weight collar. That turns fixed and adjustable dumbbells into barbell weight for bench presses, squats, deadlifts, rows, curls, overhead presses, landmine exercises and more — without buying and storing a separate collection of plates. Dualbell converters start at $44.99 and are covered by a 2-year warranty.

Bars: works with any standard 1-inch bar

Dualbell is not locked into a proprietary bar. It works on any standard 1-inch (25 mm) diameter bar, including:

• 5-foot, 6-foot and 7-foot straight bars
• EZ-curl bars
• Trap (hex) bars and triceps bars
• Landmine setups using a standard 1-inch bar

Dualbell does not fit 2-inch Olympic bars. If you already own a standard 1-inch bar, you likely have what you need to get started.

Collars are always required

Every Dualbell must be locked onto the bar with a standard 1-inch weight collar. Collars are available separately or bundled with a Pair or Superset, and collars you already own for a 1-inch bar will work.

Weight capacity: rating vs. lab test

• Rated capacity: each Dualbell is rated for a dumbbell up to 125 lb — 250 lb per pair (one dumbbell per side).
• Independent lab test: Dualbell has been independently lab tested with loads up to 1,900 lb. The lab test result is a strength benchmark, separate from the 125 lb per-unit working rating above.

Dumbbell fit: the handle decides

Your dumbbell handle must meet all three requirements:

• Minimum usable handle length: 4.25 inches (108 mm)
• Maximum handle diameter: 1.38 inches (35 mm)
• Open handle design: Dualbell must wrap completely around the handle and close securely without interfering with the dumbbell's locking or adjustment system

Measure the clear portion of the handle between the dumbbell heads, plates or adjustment mechanisms. Dumbbells with enclosed cages or structures surrounding the grip may not be compatible, even when the handle itself measures within range.

Adjustable dumbbell compatibility

Confirmed compatible adjustable dumbbells include NÜOBELL, Snode, NordicTrack, IronMaster, Core Fitness, ByZoom (12.5 lb and 25 lb models), CAP Barbell adjustable dumbbells, Bowflex SelectTech 1090i, Bowflex SelectTech 560 and Trulap. REP QuickDraw works with a little extra care in positioning, and PÉPIN fits, though its handle design can make installation more difficult. Bowflex SelectTech 552 compatibility varies by version — measure your handle before ordering. See the full Adjustable Dumbbell Compatibility Guide for fit notes.

Not compatible: PowerBlock. PowerBlock dumbbells have an enclosed handle design that does not provide the open handle access Dualbell requires.

Pair or Superset?

A Pair includes two converters — one dumbbell on each side of the bar. A Superset includes four converters and two spacers, so you can load two dumbbells per side and exceed your heaviest single dumbbell. Both are available with collars included.

Common questions

Does Dualbell work with NÜOBELL?

Yes. NÜOBELL is confirmed compatible with Dualbell, provided your model's handle meets the measurements above (at least 4.25 inches of usable length, no more than 1.38 inches in diameter, open handle).

What kind of bar do I need?

Any standard 1-inch diameter bar — straight bars in 5, 6 and 7 feet, EZ-curl, trap/triceps bars, or a landmine setup. No proprietary bar is required. Dualbell does not fit 2-inch Olympic bars.

How much weight can Dualbell hold?

Each Dualbell is rated for a dumbbell up to 125 lb (250 lb per pair). Separately, Dualbell has been independently lab tested with loads up to 1,900 lb.

Do I need collars?

Yes — collars are always required to lock Dualbell onto the bar. Use standard 1-inch collars, your own or a Dualbell bundle.

What is Dualbell made from?

Dualbell is made in the USA from injection-molded Zytel® Nylon 66, with a protective rubber insert that cushions your dumbbell handle.

*Compatibility note: the leading converter bar's own published compatibility list excludes NÜOBELL. Dualbell fits NÜOBELL because it clamps onto the dumbbell handle itself rather than locking you into a proprietary bar.