Our Take
The Bowflex SelectTech 840 is a dial-adjustable kettlebell that replaces six separate weights in a single unit, ranging from approximately 8 lb to 40 lb (roughly 3.6–18 kg). It suits home gym users with limited space who want versatility across strength and conditioning work, sitting at the premium end of the adjustable kettlebell market.
Key Features
Six weight settings selectable via a twist-dial mechanism without disassembly
Weight range: 8, 12, 20, 25, 35, and 40 lb (approximately 3.6 to 18 kg)
Compact storage tray included to hold unused weight plates
Moulded handle designed to mimic a traditional kettlebell grip width
Plastic and metal composite construction rather than solid cast iron
Compatible with the Bowflex SelectTech app for guided workouts
Our Verdict
A sensible buy for home gym owners juggling limited space who train across a range of movements and need multiple weights on a budget of floor space rather than necessarily money. Serious kettlebell enthusiasts or those regularly training above 18 kg will find it limiting and should consider traditional cast-iron sets instead.