Head-to-head · Best Adjustable Kettlebells

Bowflex SelectTech 840 vs PowerBlock Adjustable Kettlebell

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Bowflex SelectTech 840 comes out ahead by a narrow margin (4.4 vs 4.3). The gap is mostly about kettlebell beginners and casual users who want maximum convenience and a confidence-pick from a mainstream brand — read the strengths below before deciding.

Higher ratedRanked #2 in Best Adjustable Kettlebells

Bowflex SelectTech 840

4.4

$150as of May 19

The Bowflex SelectTech 840 is the beginner-friendly default. The dial adjustment is the fastest mechanism among adjustable kettlebells — BarBend rated it 5/5 on adjustment speed — and the bundled stand keeps unused plates out of the way. The trade-off is the plastic shell: it's bulky, doesn't drop well, and feels less authentic for clean or snatch work. For someone starting kettlebell training at home and not sure how far they'll take it, this is the right risk-adjusted pick.

Strengths

— Dial-and-set adjustment is the fastest in this round-up — rated 5/5 by BarBend
— Six weight settings (8, 12, 20, 25, 35, 40 lb) covers most beginner-to-intermediate workouts
— Includes a stand that holds unused plates safely

Watch-outs

— Plastic shell — durability is bounded; not built for repeated drops
— Bulkier shape than fixed bells — cleans, snatches, and rack work feel different
— Tops out at 40 lb — outgrown faster than the REP Fitness 16 kg model

$150 · Check Price on Amazon Full review →

Ranked #4 in Best Adjustable Kettlebells

PowerBlock Adjustable Kettlebell

4.3

$72as of May 19

The PowerBlock Adjustable Kettlebell is the alternative shape pick. The cowbell-style flat-angle body genuinely makes overhead presses and rack work more comfortable than the round Bowflex SelectTech 840, but it changes how swings feel — purists prefer the round REP Fitness shape. Four weight settings is the smallest count in this round-up; the magnetic pin adjustment is novel and fast once you learn it. Best for users who care more about press/clean comfort than swing dynamics.

Strengths

— Magnetic pin system for fast adjustment — no dial or twist required
— Flat-angle shape rests more comfortably during cleans and overhead presses
— Rugged steel shell — feels durable in hand

Watch-outs

— Four weight settings only — fewer increments than competitors here
— Cowbell shape (not true kettlebell) changes feel for swings — less natural
— Smaller weight range than the REP Fitness or Bells of Steel

$72 · Check Price on Amazon Full review →

How they stack up

Bowflex SelectTech 840

Fastest adjustment mechanism in this round-up — beats the REP Fitness, PowerBlock, and Bells of Steel on dial speed. Plastic shell and 40 lb ceiling are the downsides versus the all-metal competitors. Loses to the REP Fitness on swing feel; wins on convenience and the included stand. Easier first-purchase than the Bells of Steel.

PowerBlock Adjustable Kettlebell

Unique cowbell shape in this lineup — REP Fitness, Bowflex SelectTech 840, Bells of Steel, and Yes4All are all traditional round shapes. Magnetic pin adjustment is faster than the REP Fitness twist and the Yes4All disc system, slower than the Bowflex SelectTech 840 dial. Smaller weight range than the REP Fitness or Bells of Steel.

Specs side-by-side

Spec	Bowflex SelectTech 840	PowerBlock Adjustable Kettlebell
Weight Range	8 to 40 lb	18-35 lb (light) or 35-62 lb (heavy)
Weight Settings	8, 12, 20, 25, 35, 40 lb (6 settings)	4 settings per bell (18/22/26/35 lb or 35/44/53/62 lb)
Adjustment	Top dial	Magnetic pin
Material	Plastic shell, steel handle	Steel shell
Stand Included	Yes	—
Handle	28 mm	32 mm competition-standard
Shape	—	Cowbell-style flat angle

← See the full ranking of best adjustable kettlebells