Head-to-head · Best Adjustable Kettlebells

Bowflex SelectTech 840 vs REP Fitness 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

REP Fitness Adjustable Kettlebell comes out ahead by a narrow margin (4.4 vs 4.6). The gap is mostly about intermediate-to-advanced kettlebell users who want competition-shaped swings and cleans without sacrificing space for a full set — read the strengths below before deciding.

Ranked #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 →

Higher ratedRanked #1 in Best Adjustable Kettlebells

REP Fitness Adjustable Kettlebell

4.6

$220as of May 19

The REP Fitness Adjustable is the most refined adjustable kettlebell in this round-up — cast-iron internal plates with proper thermoplastic locking means it feels like a real kettlebell, not a plastic shell with weights inside. Garage Gym Lab and BarBend both rank it the best overall adjustable for 2026. The catch is you commit to one weight range (most users pick the 16 kg bell which adjusts 8-16 kg). For users who want adjustable-kettlebell convenience without sacrificing the swing/clean/snatch feel, this is the pick.

Strengths

— Cast-iron internal plates with nylon thermoplastic fasteners — no plastic shell rattle
— Push-and-twist adjustment is faster than dial-based competitors
— Competition-style shape keeps swing/clean/snatch feel consistent across weights

Watch-outs

— Single size range — pick 8-16 kg, 16-24 kg, or 20-40 lb; no all-in-one bell
— 5 increments per range is fewer than the Bowflex SelectTech 840's 6
— Pricier than the Yes4All or Bowflex SelectTech at MSRP

$220 · 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.

REP Fitness Adjustable Kettlebell

Most refined feel of the picks here — beats the Bowflex SelectTech 840 and PowerBlock on swing dynamics due to the competition-style shape. Loses to the Bowflex SelectTech 840 on quick-change convenience and to the Yes4All on price. Single-range design means you may eventually want a second bell for a different weight bracket.

Specs side-by-side

Spec	Bowflex SelectTech 840	REP Fitness Adjustable Kettlebell
Weight Range	8 to 40 lb	16 kg bell adjusts 8/10/12/14/16 kg
Weight Settings	8, 12, 20, 25, 35, 40 lb (6 settings)	5 settings (8/10/12/14/16 kg)
Adjustment	Top dial	Push-and-twist internal fasteners
Material	Plastic shell, steel handle	Cast iron internal plates, steel shell
Stand Included	Yes	—
Handle	28 mm	35 mm competition-standard
Other Sizes	—	24 kg (16-24 kg) and 40 lb (20-40 lb) options

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