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Bowflex SelectTech 552 vs PowerBlock Pro 50 Adjustable Dumbbells
Quick verdict
Winner on Gym Score: PowerBlock Pro 50 Adjustable Dumbbells (80)
PowerBlock wins on flexibility and longevity. The PowerBlock Pro 50 starts at 50 lb per dumbbell and expands to 90 lb with add-on kits — meaningful for anyone who'll outgrow the 5-50 lb range. The pin-selector mechanism has no plastic to crack, no dials to fail, and PowerBlocks routinely last 20+ years. The Bowflex 552 is more familiar (the dial spin is iconic) but it caps at 52.5 lb and the dial-and-housing design is more fragile.
Choose the Bowflex 552 if your working weights stay under 50 lb per dumbbell, you prefer the dial mechanism, and you want 2.5 lb increments (vs PowerBlock's 5 lb above 27.5 lb).
Read the full review →Choose the PowerBlock Pro 50 if you'll progress past 50 lb in the next 2 years, want a dumbbell that survives accidental drops, or value a pin-based mechanism that won't fail over 20 years.
Read the full review →
- · Apartment lifters who can't fit a rack of fixed dumbbells
- · Intermediate lifters working in the 10 to 50 lb dumbbell range
- · Hybrid home gyms that need one tool covering curls through goblet squats
- · Lifters who want a single adjustable system that scales from 5 to 90 lb per hand
- · Compact home gyms where dumbbell rack footprint is the main constraint
- · Buyers who prioritize Made-in-USA construction and lifetime warranty on the core
Spec-by-spec
| Spec | Bowflex SelectTech 552 | PowerBlock Pro 50 Adjustable Dumbbells |
|---|---|---|
| Weight Range | 5-52.5 lb | 5-50 lb (expandable to 90) |
| Increments | 2.5 lb | 2.5 lb |
| Mechanism | Dial selector | Pin selector |
Bowflex SelectTech 552
- +5-52.5 lb in 2.5 lb increments
- +2-year warranty
- +Proven 20+ year track record
- +Global aftermarket
- −Handle diameter feels bulky
- −Drop damage voids warranty
- −Plastic shell looks cheap
PowerBlock Pro 50 Adjustable Dumbbells
- +Weight
- +Ease Of Use
- +Sturdiness
- +Adjustability
- −Expandability
The real tradeoff
Shape philosophy is the divergence. PowerBlock's nested-cage design keeps the weight compact and centered on the handle — better balance under load, but visually it's not 'pretty.' Bowflex looks more like a traditional dumbbell but the brick-shaped plates sit far from the handle axis, which feels heavier at the wrist as the weight goes up. Expansion is the other gap: PowerBlock has a clear upgrade path (add-on kits to 70 lb, 90 lb); Bowflex's max is the max.
Skip both if you want a compact dumbbell that feels like a real dumbbell. The NÜOBELL 80 lb at /product/nuobell-80lb has the closest profile to a fixed gym dumbbell.
Buyer questions
How do PowerBlock add-on kits work?
You buy expansion kits ($200-400) that add 20 lb increments to your base pair. The 50 lb pair expands to 70 lb with one kit, then 90 lb with a second. The original handles work throughout — you're just adding more nested weight plates.
Why does PowerBlock score 82 vs Bowflex's 75?
PowerBlock's owner reviews emphasize durability and feel — high marks for 'lasts forever' and 'no plastic to break.' Bowflex scores well on convenience and the 2.5 lb increments but loses points on housing fragility and bulky handles at heavier weights.
Which is faster to adjust between sets?
Bowflex (3-5 seconds with the dual-dial spin). PowerBlock takes 5-7 seconds (move two pins). For high-volume superset work, the gap is noticeable but neither is fast like NÜOBELL's 1-second twist.