The Bowflex SelectTech 840 consolidates six weight increments from 8 to 40 pounds into a single dial-adjusted footprint for $149.00. While its selector mechanism offers practical space efficiency for home workouts, lifters must handle it with care to avoid mechanical failure.
Research review based on an Amazon listing, recorded specifications and captured buyer ratings. Review record from Sep 25, 2026; price, rating and availability last checked Nov 8, 2026. It does not verify every maker claim. Not a hands-on test — see how we review.
Price
$149.00
Checked Nov 8, 2026
Amazon rating
4.8
★★★★★4.8
Ratings
7,737
Best for Space-efficient kettlebell training and flows
Replacing up to six individual bells, this unit consolidates footprint through an internal dial mechanism. Selector systems in adjustable weights represent the primary point of mechanical failure, demanding controlled handling rather than floor drops. Measure ceiling clearance prior to high-volume snatches or overhead presses in low rooms.
Price, rating and availability as read from the listing on Nov 8, 2026; Amazon can change them at any time. We earn a commission on qualifying purchases.
Our scorecard
Research-based assessment
8.4out of 10
Overall
Mechanism reliability7.6
Top selector dial demands careful engagement to prevent internal lockup.
Handle ergonomics8.5
The 28-millimeter handle diameter suits both single and double-handed grips.
Weight progression8.0
Settings at 8, 12, 20, 25, 35, and 40 pounds skip micro-loading.
Space efficiency9.3
Consolidates six individual bells into an 8.82 by 7.01-inch footprint.
Value proposition8.8
Priced well below the aggregate cost of equivalent individual iron bells.
The full review
Design and Build Quality
Adjustable equipment inevitably introduces mechanical vulnerability, and adjustable kettlebells fail primarily at the selector interface. The Bowflex 840 relies on an upper turn-dial system that steps internal locking pins through weight plates nested inside a composite shell. The handle measures 28 millimeters in diameter, aligning with standard kettlebell dimensions and accommodating medium to large hands comfortably. The exterior housing measures 8.82 inches long by 7.01 inches wide, maintaining a consistent bulk regardless of the selected weight. Johnson Health Tech backs the unit with a standard two-year warranty, which provides reasonable protection against component defects. However, the internal gearing involves polymer and stamped metal segments that cannot withstand high-impact collisions. Users must confirm that the dial aligns precisely with the chosen numerical marker before lifting, as partial engagement stresses the internal linkage. Overall construction suits controlled living-room training, but it lacks the drop resistance of traditional single-piece cast-iron implements.
Real-World Performance and Ergonomics
Movement mechanics differ from traditional cast iron because the outer shell retains its maximum physical dimensions whether set to 8 or 40 pounds. For standard two-handed swings and goblet squats, the 840 performs reliably, providing a predictable center of gravity and a stable 28-millimeter grip. When executing cleans, snatches, or rack carries, the broad composite body rests somewhat flatly against the forearm, which can feel awkward compared to curved bell profiles. Internal plates also exhibit slight lateral play during explosive directional changes, resulting in an audible rattle. Anyone planning overhead presses or snatches must measure ceiling height before beginning, accounting for standing height, arm reach, and the unit's vertical extension. The weight jumps—8, 12, 20, 25, 35, and 40 pounds—are somewhat uneven, meaning progressions between the middle tiers require larger strength leaps. For steady, non-ballistic conditioning circuits, the rapid dial change minimizes downtime between sets.
Value for Money
Priced at $149.00, the SelectTech 840 delivers notable financial economy compared to outfitting a home gym with separate iron kettlebells. Acquiring six standalone cast-iron units covering 8 through 40 pounds typically costs significantly more when factoring in per-pound iron prices and shipping surcharges. The product carries a 4.8 out of 5 rating across more than 7,700 reviews, pointing to broad consumer satisfaction regarding reliability in residential environments. Bowflex includes a two-month trial for their JRNY digital membership, though the mechanical utility of the hardware stands entirely on its own without requiring ongoing app fees. For small residential quarters where storing multiple kettlebells is unfeasible, the footprint savings alone offset the structural compromises. While heavy lifters might outgrow the 40-pound maximum quickly, entry-level to intermediate fitness enthusiasts receive six functional resistance settings for the price of two standard commercial-grade bells.
Who Should Skip It
Dedicated kettlebell sport and hardstyle practitioners should bypass the SelectTech 840. The internal selector assembly cannot survive ballistic failures, unintended floor drops, or high-velocity kettlebell-to-kettlebell contact during dual-bell routines. Athletes who regularly train above 40 pounds will find the resistance ceiling insufficient for heavy swings, deadlifts, and rows. If your training relies on precise competition dimensions, the rigid composite housing does not mimic the weight-to-volume ratio of steel competition bells, disrupting technique on cleans and Turkish get-ups. Lifters working out in garages with low rafters should verify overhead clearances prior to purchase, as the fixed height of the shell requires ample vertical room. Anyone unwilling to treat the mechanical adjustment dial with care should invest instead in single-piece powder-coated cast iron, which offers indefinite longevity without moving parts that can wear down or jam over extended training cycles.
Specifications
Recorded from the listing
Included Components
Kettlebell
Item Weight
40 pounds
Item Dimensions L x W
8.82"L x 7.01"W
Number of Packs
1
Item Type Name
Bowflex SelectTech 840 Kettlebell
Model Number
100790
Part Number
100790
Warranty Description
2 years
Handle Diameter
28 millimeters
Number of Pieces
1
Brand Name
Bowflex
Unit Count
1 Count
Number of Items
1
Manufacturer
Johnson Health Tech Trading
What to confirm for this exact model
Potential fit
Space-efficient kettlebell training and flows. Confirm that the model and included equipment meet your intended use.
Trade-off to resolve
Internal selector dial vulnerable to drop impact Check whether this matters for your setup before ordering.
Included equipment and compatibility
Check the exact variant, quantity, dimensions, required accessories and any applicable power or connection requirements. A missing specification is unknown, not proof that a feature is absent.
Ownership and purchase terms
Verify seller, delivered price, return conditions and manufacturer warranty for your location. Check replacement parts and ongoing costs where applicable.
Recorded price history
2 checks · Sep 25, 2026 to Nov 8, 2026
Prices we read from the Amazon listing on each check, for the new item as sold on the listing page. They are snapshots between checks, not a complete price record; offers can change several times a day.
Latest
$149.00
Lowest recorded
$149.00
Sep 25, 2026
Highest recorded
$149.00
Since previous
No change
Each recorded price check
Checked
Price
Read from
Nov 8, 2026
$149.00
Listing page
Sep 25, 2026
$149.00
Listing import
What the maker claims
—TURN OF A DIAL: With the turn of a dial, you can easily adjust from 8 to 40 lbs., rapidly switch from one exercise to the next, and perform a wide variety of full-body exercises.
—SPACE EFFICIENT: Replaces up to 6 kettlebell with weights at 8, 12, 20, 25, 35, and 40 lbs.
—JRNY MOBILE-ONLY MEMBERSHIP: Workout at home or on the go with inspiring trainers, and just-for-you adaptive workouts, from your phone or tablet.
—WIDE WEIGHT RANGE: Offers a variety of workouts, including swings, rows, squats, twists and more.
—SPACE-SAVING DESIGN: Ensures a quality workout from nearly any room in your home.
How it compares
Related listings
Alternatives are selected by recorded product-type relevance and price proximity. Confirm exact purpose and compatibility; a shared category does not guarantee interchangeability.
A dash means the value was not recorded, not that a feature is absent. Prices and ratings are captured snapshots; editorial scores are research assessments rather than measured performance.
Common questions
Can the Bowflex SelectTech 840 be dropped during workouts?
No. Adjustable weights rely on internal selector pins and composite housings that will fracture or misalign on impact. The unit must always be placed down with care. Lifters requiring equipment capable of surviving repeated drops or ballistic releases should purchase single-piece cast iron or steel competition kettlebells instead.
What are the available weight settings on this kettlebell?
The internal mechanism provides six distinct weight selections: 8, 12, 20, 25, 35, and 40 pounds. Adjustments are executed by turning the top-mounted dial while the unit sits in its base plate. The irregular weight gaps require lifters to adapt to jumps ranging from 4 to 10 pounds.
What is the handle diameter, and does it support two-handed grips?
The handle has a 28-millimeter diameter, matching standard light-to-medium kettlebell dimensions. The handle width accommodates two hands for goblet squats and swings for most users, although individuals with exceptionally broad hands may find their pinky fingers resting near the curved corners of the upper housing assembly.
Does the kettlebell require an active JRNY membership to function?
No. The kettlebell functions entirely mechanically without electronics, software, or digital locks. While Bowflex includes a two-month trial for their JRNY mobile workout platform, the selector mechanism operates independently. The app will auto-renew at standard subscription rates unless canceled prior to the trial period ending.
How we judge home gym equipment
Rule 01
Check documented load ratings, steel gauge, anchoring and attachment compatibility; upright dimensions alone do not establish safety.
Rule 02
Adjustable dumbbells fail at the selector — check the mechanism.
Rule 03
Measure ceiling height before anything you plan to press overhead.
Sources and limits
This page summarizes our research reviews of Amazon listings, listed specifications and captured buyer ratings. It is not a hands-on test. Scores are editorial assessments, not measured performance; prices are recorded snapshots and may change. A category can include both main products and accessories, so its overall price range is not the cost of a complete setup.
Most recent product record update: September 25, 2026. Individual records may be older; this is not a verification date for every claim. Prices on this page were read from the listings Nov 8, 2026.
