Best Adjustable Dumbbells UK (August 2026): NÜOBELL, Bowflex, PowerBlock, BRAINGAIN & FEIERDUN Compared Honestly

1. Cost and Price: What You Actually Pay in the UK

Adjustable dumbbell prices in the UK have stabilised after the post-pandemic home gym boom. You are no longer paying the £600–£800 scalper prices of 2020–2021. Here is what each model costs as of August 2026, verified against live Amazon UK listings:

Important: The Bowflex is sold as a single dumbbell. To get a pair, you need to buy two — effectively £426 total. This brings it closer to the NÜOBELL price. Factor this into your budget. The FEIERDUN, BRAINGAIN, PowerBlock, and NÜOBELL are all sold as pairs.

Shipping is generally free on Amazon UK for these items, though the heavier sets may require delivery to a ground-floor location.

2. Problems and Drawbacks: What Nobody Tells You

Every adjustable dumbbell involves a compromise between convenience, durability, and price. Here is what goes wrong with each model — sourced from Amazon UK reviews, Reddit threads (r/homegym, r/homefitness), and long-term owner reports.

NÜOBELL Classic — Fragile Plastic Mechanism

The NÜOBELL's biggest selling point is also its Achilles' heel. The twist-handle mechanism uses plastic internal gears that can strip or crack if dropped. Several Reddit users report breakage after a single drop from waist height onto a rubber mat. The warranty is 2 years, but replacement parts are difficult to source in the UK. Do not buy NÜOBELLs if you train to failure and occasionally drop weights.

Bowflex SelectTech 552 — Bulky and Wide

The Bowflex 552 is physically large — roughly 40cm long even at light weights. This makes exercises like hammer curls and tricep extensions feel awkward because the dumbbell hits your forearm or torso. The dial mechanism is reliable but cannot be operated one-handed in the cradle — you need both hands to turn it. The plastic cradle tray is also prone to cracking after 2–3 years of daily use.

PowerBlock Sport 24 — Limited Weight, Odd Feel

The selector-pin design is bombproof, but the Sport 24 only goes to 11kg per hand. That is fine for beginners but useless for intermediate lifters on compound movements. The cage design also feels unbalanced compared to a traditional dumbbell — your hand sits inside a metal rectangle, which puts the centre of mass in an unusual position for curls and presses.

BRAINGAIN Quick-Change — Unknown Longevity

BRAINGAIN is a Chinese brand producing NÜOBELL-style clones at a lower price. The mechanism is similar but uses cheaper internal components. Several Amazon reviewers report the weight plates developing play within 6 months, causing a rattling noise. Customer support is slow — expect 5–7 day response times. Buy this if you want the NÜOBELL experience at 65% of the price, but accept you are rolling the dice on durability.

FEIERDUN Adjustable — Slow Adjustments

The FEIERDUN is a traditional spin-lock design. To change weight, you unscrew the collar, swap plates, and re-tighten — this takes 30–45 seconds per dumbbell. For circuit training or drop sets, this is unusably slow. The included plates are cast iron with a rough finish that smells of machine oil out of the box and can stain light-coloured flooring. The 25kg max is theoretical — with the spin-lock collars fully engaged, you realistically get 22–23kg of usable weight before the collars start slipping.

3. Head-to-Head Comparison

Key takeaway: The Bowflex wins on overall balance — good weight range, decent durability, and proper UK warranty support. The NÜOBELL wins on speed but loses on fragility. The PowerBlock wins on toughness but loses on weight ceiling. The FEIERDUN wins on price alone.

4. Who Each Product Is For

NÜOBELL Classic 2–20kg — Best for: Fast-Paced Training Styles

Buy if: You do circuits, HIIT, or drop sets where changing weights in under 5 seconds matters. You train on rubber flooring and never drop weights. You want the most premium feel and are willing to pay for it.

Avoid if: You train heavy to failure. You have ever dropped a dumbbell. You are buying for a shared or commercial gym where multiple people will use it. Budget is under £400. View on Amazon · Find on eBay

Bowflex SelectTech 552 — Best for: Most People (Editor's Pick)

Buy if: You want one reliable set for all your home workouts. You need a weight range that covers both isolation and compound lifts. You value having proper UK customer support and a known brand with a decade-long track record.

Avoid if: You want compact dumbbells for exercises like hammer curls or close-grip press — the 552 is physically long. You do very fast circuit training and need sub-5-second changes. You need more than 24kg per hand for your main lifts. View on Amazon · Find on eBay

BRAINGAIN Quick-Change — Best for: NÜOBELL Experience on a Budget

Buy if: You want the fast twist-handle mechanism but cannot justify £482 for the NÜOBELL. You are willing to accept some risk on long-term durability in exchange for saving £168.

Avoid if: You need guaranteed reliability. You plan to use these daily for years. Customer support responsiveness matters to you. View on Amazon · Find on eBay

PowerBlock Sport 24 — Best for: Beginners Who Want Indestructible Gear

Buy if: You are new to lifting and do not need more than 11kg per hand yet. You want something that will survive being knocked around. You are buying for a teenager or someone who might not treat equipment gently.

Avoid if: You can already curl more than 12kg. You plan to progress beyond beginner weights within 6 months. The cage-style grip bothers you ergonomically. If you outgrow 11kg, these become expensive paperweights — buy something with headroom. View on Amazon · Find on eBay

FEIERDUN Adjustable Set — Best for: Absolute Budget

Buy if: Your budget is strictly under £60. You do not do timed circuits or drop sets. You are willing to spend 40 seconds changing weights between exercises. You want real cast iron, not plastic.

Avoid if: You want quick weight changes. You care about a premium feel or finish quality. You train in a carpeted room — the rough iron plates can leave rust marks. The machine oil smell will bother you. View on Amazon · Find on eBay

5. Best in Class: Our Verdict

The Bowflex SelectTech 552 is our overall winner. It is not the cheapest, not the fastest to change, and not the most compact — but it is the best-balanced adjustable dumbbell for UK home gym users. The 2–24kg range covers everything from lateral raises to goblet squats for most people. The dial mechanism has been refined over two decades and rarely fails. Bowflex has proper UK warranty support, and replacement parts are available.

The NÜOBELL Classic is the runner-up and the better choice if you prioritise speed. At ~3 seconds per change versus the Bowflex's ~8 seconds, it is genuinely better for circuit training. But the plastic gear fragility is a real risk — if you drop a NÜOBELL once, you may need a whole new unit. That is a £241 gamble per dumbbell.

If you are on a tight budget: The FEIERDUN at £50 is a legitimate option. It is slow to adjust and rough around the edges, but it is real cast iron that will last. For the price of one NÜOBELL pair you could buy nine FEIERDUN sets. For most people starting a home gym from scratch, start with the FEIERDUN and upgrade later.

If you need the most durable option: The PowerBlock Sport 24 is built like a tank — but you will outgrow 11kg quickly. Consider the PowerBlock Pro 50 or PowerBlock Elite if you need more weight (available from specialist UK retailers, not always on Amazon).

Sources and Evidence

• Amazon UK — Live prices and verified purchase reviews for all five products (checked August 2026)
• Reddit r/homegym — Long-term durability reports on NÜOBELL plastic gear failures and Bowflex cradle cracking
• Reddit r/homefitness — Real user comparisons between Bowflex 552 and NÜOBELL, including complaints about Bowflex bulkiness
• Reddit r/BuyItForLife — PowerBlock durability reports; consensus is the cage design is nearly indestructible
• RedRecs.com — Aggregated Reddit sentiment analysis ranking PowerBlock #1 overall for durability, NÜOBELL #1 for speed
• Threadlens.co.uk — UK-specific adjusted rankings accounting for Amazon UK availability and pricing
• Men's Fitness UK — Professional testing notes on ergonomics and balance across adjustable dumbbell designs

Frequently Asked Questions

Are adjustable dumbbells worth it for a home gym?

Yes — if you have limited space. A single adjustable pair replaces 10–15 individual dumbbells, saving roughly 2 square metres of floor space. The price premium is significant (a set of individual hex dumbbells covering 2–20kg costs around £200–£300), but the space saving is transformative for most UK homes where a spare room or garage corner is the only option.

Do I need a pair or is one adjustable dumbbell enough?

One dumbbell works for unilateral exercises (single-arm rows, split squats, Turkish get-ups). But for bilateral movements — bench press, shoulder press, goblet squats with two dumbbells, bent-over rows — you need a pair. If you are serious about building strength, budget for two. The Bowflex 552 is sold as a single unit; you need two at £213 each (£426 total).

Can adjustable dumbbells replace a full gym membership?

For most people, yes. With a pair of adjustable dumbbells, a bench, and a pull-up bar, you can perform every major movement pattern: push (press variations), pull (rows), squat (goblet, Bulgarian split), hinge (Romanian deadlifts, single-leg). What you miss: heavy barbell squats and deadlifts (over 50kg), cable machines for isolation, and leg press. For £50–£500 one-off versus £30–£60 monthly gym fees, the break-even is 2–17 months depending on which dumbbells you choose.

Which adjustable dumbbells are quietest for flat training?

The NÜOBELL and Bowflex are the quietest — the moulded plates do not clang. The PowerBlock is near-silent since it has no moving plates at all. The FEIERDUN spin-lock is the loudest; cast iron plates rattle and clank during use. If you train early mornings or late nights in a flat, avoid spin-lock designs entirely. The Bowflex specifically advertises itself as "apartment friendly" and the rubberised plate coating genuinely reduces noise.