BowFlex SelectTech 840 Adjustable Kettlebell
- 8 to 40 pounds, 6 weight settings
- Dial selects the weight
- 28 millimeter handle, plastic
- 8.82 x 7.01 inches footprint
- Composite body, one kettlebell
- 5 year EU spare part availability
Last refreshed Jun 30, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A single dial-select kettlebell that replaces a rack of fixed bells in a small space. The handle is plastic, and the JRNY app needs a paid subscription after its trial.
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ASIN: B07X64MXBSModel: SelectTech 840Category: Kettlebells
Overview
Apartment floor space is limited, and this dial-select bell offers six weights in one body. A turn of the dial sets the weight, and the body is composite with an ergonomic plastic handle.
One bell replaces a rack of fixed weights, which saves floor space for swings and presses. The selector mechanism gives it a bulkier base than a plain cast bell. A trial of the JRNY app is offered, with a subscription required after.
Who it's for
Home exercisers with little storage who want to change weight between swings, squats and presses. Heavy lifters and anyone who prefers a single-piece cast bell should buy fixed weights.
Pros and cons
- Six weights in one bell
- Dial changes weight quickly
- Saves floor space
- Long spare part availability
- Plastic handle, not cast iron
- Bulky base for the weight
- App needs a subscription after trial
Performance notes
A selector dial locks the chosen weight into the bell, so swings, goblet squats and presses use the same handle at different loads. The body shape is set by the selector mechanism, which affects how it swings and rests on the floor. Handle width and grip texture decide comfort on long sets.
Specifications
| Brand | BowFlex |
|---|---|
| Model | SelectTech 840 |
| Dimensions & fit | |
| Handle Diameter | 28 millimeterslower than 91% of 34 kettlebells |
| Item weight | 40 pounds |
| Weight range | 8 to 40 pounds |
| Weight settings | 6 |
| Item dimensions L x W | 8.82"L x 7.01"W |
| WIDE WEIGHT RANGE | Offers a variety of workouts, including swings, rows, squats, twists and more. |
| Construction & materials | |
| Material | Composite |
| Color | Black |
| Handle material | Plastic |
| Included components | |
| Number of pieces | 1 |
| Other details | |
| Special features | Adjustable Weight, Ergonomic |
| EU spare part availability | 5 years |
| 2-MONTH FREE TRIAL | Try our JRNY All-Access Membership for 2 months, free. |
| SPACE-SAVING DESIGN | Ensures a quality workout from nearly any room in your home. |
Closest rivals on specs
Rep Fitness Adjustable Kettlebell 20-40 lb- Handle Diameter 1.1 vs 1.3 inches (-15%)
Fitvids Soft Sand Filled Kettlebell 5 lb- Item Weight 40 vs 2 pounds (+1900%)
Fitvids Soft Sand Filled Kettlebell 15 lb- Item Weight 40 vs 2 pounds (+1900%)
Frequently asked questions
Is the BowFlex SelectTech 840 a fixed-weight kettlebell?
No. A dial selects the weight, and the style reads 8-40lbs.
Does the BowFlex SelectTech 840 include the JRNY app?
The description offers a free two month trial of JRNY on a phone or tablet. A subscription is required, and it renews automatically after the trial.
Does the BowFlex 840 come as a pair?
No. The number of pieces is one, a single kettlebell.
Is the BowFlex 840 handle made of iron?
No. The handle material is listed as plastic, and the body is composite.