BrainGain SmartBells Pro vs Bowflex SelectTech 552: Which Adjustable Dumbbell Is Better?

Weight Range and Who It Suits

The biggest difference between these two dumbbells is how heavy they go. Bowflex tops out at 24kg (52.5 lbs) per dumbbell. For lateral raises, bicep curls, and light pressing movements, that is enough. But for compound lifts like dumbbell rows, chest press, or goblet squats, most men will outgrow 24kg within 6 to 12 months of consistent training.

BrainGain's 41.5kg maximum means you are buying for where your strength is heading, not where it is now. If you currently press 20kg dumbbells, you will likely need 30kg+ within a year. Buying heavier upfront avoids replacing your dumbbells later.

BrainGain also offers lighter models at 23.5kg and 32.5kg per dumbbell for those who do not need the full 41.5kg range.

Progressive Overload and Increments

Progressive overload, adding small amounts of weight over time, is the foundation of strength training. Smaller increments allow smoother progression and reduce injury risk from jumping too much weight at once.

BrainGain offers 1.5kg increments across the full range, giving you 26 distinct weight settings per dumbbell. Bowflex offers 2.5 lb (1.1kg) increments up to 25 lbs, then jumps to 5 lb (2.3kg) increments.

This means Bowflex has finer increments at the lighter end, but coarser jumps as you get heavier, which is exactly where precise progression matters most.

Build Quality and Durability

Bowflex uses steel plates enclosed in plastic moulding. The plastic reduces noise but introduces durability concerns. Multiple review sites report that the plastic can crack if the dumbbells are dropped, and Bowflex's warranty is voided by drops. In June 2025, Bowflex issued a product recall for the SelectTech 552 due to plates potentially dislodging during use.

BrainGain's SmartBells Pro uses steel plates with minimal plastic. The knurled metal handle provides a secure grip without rubber that can degrade over time. BrainGain has had no product recalls and was independently tested by SaferBuy, a European product verification institute, scoring 97.5 out of 100.

Adjustment Speed

Both dumbbells use a twist mechanism rather than pin or plate-loading systems, making them among the fastest adjustable dumbbells to change weight.

BrainGain uses a single handle twist that changes weight in under 1 second. Bowflex requires turning a dial on both ends of the dumbbell, which takes 2 to 3 seconds. For supersets and drop sets where speed matters, BrainGain has a small advantage.

Price and Value

Bowflex is the cheaper option at approximately EUR 350–480 per pair depending on retailer. BrainGain starts at EUR 459 for the 23.5kg model and goes up to EUR 689 for the 41.5kg pair.

However, if you outgrow Bowflex's 24kg limit, you will need to buy a second set of heavier dumbbells. A pair of BrainGain 41.5kg dumbbells replaces 26 individual dumbbells and covers most lifters for years without needing an upgrade.

Availability in Europe

Bowflex is a US-based brand. In Europe, availability depends on third-party retailers such as Amazon, Decathlon, and Argos in the UK. Warranty claims go through the retailer, not Bowflex directly. Customer support in German or French is limited.

BrainGain is a European brand shipping directly from eu.braingain.fit with free delivery across the EU. The website and customer support are available in English, German, and French. Warranty claims are handled directly by BrainGain.