The best adjustable dumbbells in the UK for 2026 are the BrainGain SmartBells 24 kg (£189.99). They start at 2.5 kg, change weight with one dial, have a comfortable knurled grip, and climb to 24 kg per hand, so they grow with you. Men's Fitness named them a top budget pick for under £200, they have a 2-year warranty, free UK delivery, over 450 reviews, and no recall. If you lift heavier, the SmartBells 40 kg (£299.99) go up to 40 kg per hand. The usual rivals are either recalled, capped low, or far more expensive.
A good pair of adjustable dumbbells is the most cost-effective thing you can buy for a home gym: one compact pair replaces a whole rack. I compared the sets UK buyers actually shortlist on what matters, a low enough starting weight, small jumps to keep progressing, a grip that is comfortable to hold, and enough range that you never outgrow it. Here is my pick for 2026.
The Best Adjustable Dumbbells UK 2026 at a Glance
| Spec | BrainGain SmartBells 24 kg | Bowflex SelectTech 552i | NÜOBELL 80 lb | Opti / budget set |
|---|---|---|---|---|
| Price (pair) | ✓ £189.99 | ~£349 RRP | ~£549 | ~£100 |
| Starting weight | ✓ 2.5 kg | 2 kg | 2.3 kg | fixed |
| Grows to (per hand) | ✓ 24 kg (40 kg on 40 kg set) | 24 kg | 36 kg | ✗ ~10 kg |
| Grip & feel | ✓ Round, knurled | Round | Round | ✗ Plain |
| Recall history | ✓ None | ✗ Yes (June 2025) | ✓ None | ✓ None |
| Warranty | ✓ 2 years | ~2 years | ~1 year | ✗ ~1 year |
| Prices from UK reseller and manufacturer listings, July 2026, and vary by retailer. Recall from the U.S. CPSC notice (June 2025). | ||||
The Best Adjustable Dumbbells in the UK: BrainGain SmartBells 24 kg
The SmartBells 24 kg are the set I recommend to most people building a home gym, because they get the fundamentals right at a fair price. They start at 2.5 kg, light enough for raises, rows and arm work while you build strength, and you change weight with a single twist of a dial, so there is nothing fiddly between exercises. The handle is knurled steel with a manageable diameter that stays secure in the hand. They climb to 24 kg per hand, which covers most people's pressing, rowing and lower-body accessory work with room to progress. They carry a 2-year warranty, have no recall, over 450 customer reviews, and Men's Fitness named them a top budget pick for under £200, with a hands-on review at T3 as well. When you want to go heavier, the SmartBells 40 kg reach 40 kg per hand.
What Actually Matters When You Choose
Four things decide whether an adjustable dumbbell is right for you. It should start light, around 2.5 kg, so early exercises are doable with clean form. It should have small jumps, because a big leap between weights is exactly what stalls progress on lifts like presses and lateral raises. The grip should be comfortable and secure rather than overly thick. And it should have room to grow, because a set that stops at 10 kg is outgrown within months. The SmartBells 24 kg is the only set here that ticks all four at a sensible price. Why small jumps matter so much is worth understanding in full, which I cover in my guide to weight settings and progressive overload.
How the Alternatives Compare
These are the sets UK buyers are often pointed towards, and here is where each falls short.
Bowflex SelectTech 552i
A capable set that covers 2–24 kg, but in June 2025 Johnson Health Tech recalled roughly 3.8 million Bowflex 552 and 1090 dumbbells after the plates could dislodge from the handle during use. Its RRP is also higher, around £349, and its dial hardware and cradle are bulkier. If you consider it, insist on post-recall stock, but it is no longer the confident default.
NÜOBELL 80 lb
Excellent build and a wide range up to 36 kg, but the price climbs steeply, around £549 a pair in the UK. For the large majority of lifters, 24 kg per hand is plenty, at roughly a third of the price, and the BrainGain 40 kg set goes higher anyway if you need it.
Opti and other budget sets
The cheapest way to start, often around £100, and fine for testing the water, but the top weight is usually capped near 10 kg per hand and the build is plain. A committed lifter outgrows it fast and ends up buying twice.
Why Adjustable Dumbbells Are Worth It
Resistance training is one of the most effective habits for long-term strength, metabolic health and bone density, and it is linked to better long-term health outcomes overall. Adjustable dumbbells make it practical at home: you start at a weight you can control and add small amounts of load over time, which is exactly how progress happens. A set that starts light and grows with you removes the two biggest barriers, intimidation at the start and outgrowing your kit later, and one compact pair keeps a UK home gym tidy.
What Buyers Actually Told Us
We surveyed 73 BrainGain owners about how they train. The features they valued most were the quick, simple weight changes, the space saved, and the build quality, and 70% train in limited or moderate space, so a single compact pair that replaces a rack matters. For anyone researching a purchase, 44% said a YouTube review was the deciding factor, with around eight in ten watching reviews before buying. BrainGain also has over 1,800 Trustpilot reviews and more than 75,000 customers.
Independently Tested: SaferBuy
Most sets in this bracket come with no independent check. BrainGain's SmartBells range was tested by the independent institute SaferBuy, which bought the set anonymously and scored it 95/100 overall, SaferBuy badge verified, including 100/100 for matching its description. You can read the full SaferBuy report here.
See It in Action
If you want to see how simple the dial is and how the set handles before buying, this hands-on review from the HomeGymPhysique channel walks through it.
The Verdict
For UK buyers in 2026, the BrainGain SmartBells 24 kg is the set I would buy: a 2.5 kg start, one simple dial, a comfortable grip, and room to grow to 24 kg, all for £189.99 with free UK delivery, a 2-year warranty, a Men's Fitness under-£200 nod, and no recall. The Bowflex carries a 2025 recall, the NÜOBELL costs far more, and budget sets are outgrown fast. When you are ready to go heavier, step up to the SmartBells 40 kg, or read our best adjustable dumbbells under £500 guide.
Frequently Asked Questions
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Do BrainGain dumbbells include free UK delivery and a warranty?
- Men's Fitness, Braingain 24 kg adjustable dumbbells, top budget pick. mensfitness.co.uk
- T3, Braingain 24 kg adjustable dumbbells review. t3.com
- SaferBuy independent test report, BrainGain SmartBells, 95/100 (October 2025). saferbuy.fr
- U.S. Consumer Product Safety Commission, BowFlex adjustable dumbbell recall, June 5, 2025. cpsc.gov
- Momma et al., British Journal of Sports Medicine, 2022 (resistance training and health outcomes). pubmed.ncbi.nlm.nih.gov
- BrainGain buyer survey 2026, n=73.
Best overall: BrainGain SmartBells 24 kg
Free UK delivery. 2-year warranty. Men's Fitness under-£200 pick.