Adjustable Dumbbells Review
Why Adjustable Dumbbells Beat a Full Rack
A complete dumbbell rack from 5 to 50 pounds requires 20 pairs of dumbbells, costing $1,500+ and occupying 8+ feet of wall space. A quality adjustable dumbbell set replaces that entire rack with a single pair that adjusts in seconds.
For home gym owners in apartments or smaller homes, this space savings alone justifies the investment. But convenience matters too: changing weights on a traditional rack means walking across the room between exercises. Adjustables let you transition from curls to presses without leaving your mat.
What to Look For
Weight Range
Most lifters need 5-50 lbs per hand for a full-body routine. Beginners may start lighter, but you will outgrow 25-lb max dumbbells within months. Look for sets that expand with add-on kits.
Adjustment Mechanism
- Dial systems (Bowflex, NordicTrack): Twist a dial to select weight. Fastest option, but internal mechanisms can wear over years of heavy use.
- Pin systems (PowerBlock): Slide a pin into color-coded weight stacks. Extremely durable, but slightly slower than dials.
- Spin-lock (cheap Amazon sets): Screw collars onto threaded handles. Avoid these. They loosen during workouts and are frustratingly slow.
Durability
Drop tests matter. Plastic adjustment mechanisms crack when dropped from hip height. Metal-pin systems survive accidental drops better. If you train alone without a spotter, durability is non-negotiable.
Top Picks Under $400
1. Bowflex SelectTech 552 — Best Overall
The SelectTech 552 adjusts from 5 to 52.5 pounds in 2.5-lb increments using a simple twist dial. The dumbbells feel solid in hand, and the weight distribution is surprisingly natural given the mechanical internals.
Pros: Widest weight range in class, fast adjustments, reputable brand with replacement parts available. Cons: Length stays constant regardless of weight selected (feels awkward for light exercises), not meant for dropping.
2. NordicTrack iSelect — Best Tech Integration
The iSelect connects to your phone via Bluetooth and automatically adjusts weight when following iFIT workouts. The tech is genuinely useful if you follow programmed routines, but unnecessary for experienced lifters who design their own workouts.
Pros: Smart weight adjustments, excellent build quality, iFIT integration. Cons: Tech adds cost, requires subscription for full features, app dependency.
3. PowerBlock Elite EXP — Most Durable
PowerBlocks use a pin-in-stack system with a rectangular design that some lifters find odd initially. But they are virtually indestructible, expandable to 90 lbs per hand with add-on kits, and backed by a 5-year warranty.
Pros: Lifetime durability, expandable system, compact footprint. Cons: Non-traditional shape limits some exercises, pin system slower than dials.
Workout Routines for Adjustable Dumbbells
A full-body routine using only adjustable dumbbells:
Day A (Push):
- Floor press: 3x10
- Overhead press: 3x10
- Lateral raises: 3x15
- Tricep extensions: 3x12
Day B (Pull):
- Bent-over rows: 3x10
- Bicep curls: 3x12
- Hammer curls: 3x12
- Rear delt flyes: 3x15
Day C (Legs):
- Goblet squats: 3x12
- Romanian deadlifts: 3x10
- Lunges: 3x10 per leg
- Calf raises: 3x20
Frequently Asked Questions
Are adjustable dumbbells safe? Yes, if used correctly. Do not drop them. Check that the mechanism is fully engaged before each lift. Do not exceed the manufacturer's weight limits.
Can adjustable dumbbells replace a gym membership? For most people, yes. A pair of adjustables plus a bench and pull-up bar covers 90% of what most gym-goers need. Elite powerlifters and bodybuilders will eventually need barbells and machines.
How long do adjustable dumbbells last? Quality sets last 5-10 years with normal use. The Bowflex mechanism may need adjustment after heavy use; PowerBlocks are essentially lifetime purchases.
The Bottom Line
For under $400, adjustable dumbbells are the single best investment for a home gym. The Bowflex SelectTech 552 is the safest choice for most buyers. Choose PowerBlock if durability is your top priority, or NordicTrack if you want guided workouts.