BowFlex SelectTech 840 Adjustable Kettlebell
- Item Weight: 40 pounds
- Handle Diameter: 1.1 inches
- Warranty Description: 2 years
- Color: Black
Last refreshed Jun 30, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
As an Amazon Associate I earn from qualifying purchases. ProductDome earns a commission when you buy through links on this page.
ASIN: B07X64MXBSModel: SelectTech 840Category: Kettlebells
Overview
The BowFlex SelectTech 840 is a single kettlebell that adjusts from 8 to 40 lbs by turning a dial, replacing six fixed kettlebells (8, 12, 20, 25, 35, and 40 lbs) in one compact shell.
The dial mechanism is the entire value proposition: instead of storing a rack of kettlebells, one unit covers a wide range for swings, squats, rows, and presses.
- Adjusts from 8 to 40 lbs via a turn-dial mechanism
- Replaces six fixed kettlebells (8, 12, 20, 25, 35, 40 lbs)
- Includes a 2-month trial of the JRNY mobile membership
- Compact, space-saving shell design
Who it's for
Fits home gyms with limited space where switching between exercises and weights quickly matters more than having a traditional cast handle. Less ideal for anyone who wants the exact grip feel of a solid kettlebell or who dislikes larger jumps between weight settings.
Pros and cons
- One dial swaps between six weights from 8 to 40 lbs
- Locks in securely with no wobble during use
- Saves significant space over a rack of kettlebells
- Plastic housing feels less solid than cast iron
- Handle is thinner and smoother, offering less grip texture
- Jump from 25 to 35 lbs is larger than steps around it
Performance notes
The jump from 25 to 35 lbs is a bigger single step than the increments below it, which one reviewer flagged as worth planning around if progressing gradually matters.
Specifications
| Brand | BowFlex |
|---|---|
| Model | SelectTech 840 |
| Dimensions & fit | |
| Item Weight | 40 poundshigher than 80% of 36 kettlebells |
| Handle Diameter | 1.1 incheslower than 91% of 34 kettlebells |
| WIDE WEIGHT RANGE | Offers a variety of workouts, including swings, rows, squats, twists and more. |
| Construction & materials | |
| Color | Black |
| Included components | |
| Unit Count | 1 |
| Warranty & support | |
| Warranty Description | 2 years |
| Other details | |
| Part Number | 100790 |
| Item Type Name | Bowflex SelectTech 840 Kettlebell |
| 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
What weight range does the BowFlex SelectTech 840 cover?
8 to 40 lbs, adjustable by turning the dial through six settings: 8, 12, 20, 25, 35, and 40 lbs.
Is the handle the same as a traditional kettlebell?
Not quite; at least one reviewer who owns cast-iron kettlebells found the handle thinner and smoother, offering less grip texture than a solid kettlebell.