Are you tired of cluttering your home gym with multiple kettlebells of different weights? The BowFlex SelectTech 840 adjustable kettlebell solves this problem with a simple turn of a dial. In this guide, we evaluate the best adjustable kettlebell on the market for 2026 and explain why it might be the perfect fit for your fitness routine. For a broader look at kettlebell options, check out our guide to the best kettlebells.
Pros
- Dial mechanism allows instant weight switching between exercises without needing multiple kettlebells
- Solid construction with secure weight locking and no wobbling or shifting during movement
- Comfortable, ergonomic grip suitable for both single and double-handed exercises
- Compact footprint makes it practical for small apartments, bedrooms, and shared spaces
- Excellent customer satisfaction with consistently high ratings and positive real-world feedback
Cons
- Handle diameter of 28mm may feel slightly narrow for users with larger hands during certain exercises
- Requires JRNY subscription after free trial period to access guided workouts and motion tracking features
- At 40 lbs maximum weight, may be limiting for advanced users seeking heavier kettlebell training
The Bowflex SelectTech 840 is an adjustable kettlebell designed for home fitness enthusiasts who want versatility without clutter. It combines the functionality of six traditional kettlebells into one compact device, making it perfect for apartment dwellers, home gym builders, and anyone seeking efficient strength training solutions. The product targets users of all fitness levels, from beginners to intermediate lifters.
The standout feature is the dial-based weight adjustment system that lets you switch between 8, 12, 20, 25, 35, and 40-pound settings instantly. Users consistently praise the smooth mechanism and secure locking, which means you can move rapidly between exercises without safety concerns. The kettlebell performs excellently across a wide variety of movements including swings, rows, squats, presses, and twists, delivering measurable results in strength, muscle definition, and core stability within weeks of consistent use.
Build quality is exceptional with solid composite construction, an ergonomic grip, and even weight distribution that prevents wobbling during movement. The handle diameter of 28mm is comfortable for most users, though those with larger hands might find it slightly snug. The device ships ready to use with no assembly required, and the 2-year warranty provides confidence in long-term durability.
The main limitations are the 40-pound maximum weight, which may restrict advanced lifters seeking heavier training, and the JRNY membership subscription required after the free trial to access guided workouts. Some users also note that a slightly larger handle would enhance versatility for certain exercises. Despite these minor considerations, the value proposition is strong for space-conscious home gym owners.
The Bowflex SelectTech 840 is a smart, well-engineered investment that delivers genuine results. With overwhelming positive feedback, reliable performance, and practical space-saving design, it represents excellent value for anyone serious about home strength training without the clutter of traditional kettlebell collections.
Weight Range: 8, 12, 20, 25, 35, 40 lbs (6 adjustable settings)
Maximum Weight: 40 lbs
Total Unit Weight: 40 lbs
Dimensions: 8.82 inches (L) x 7.01 inches (W)
Handle Diameter: 28 mm
Handle Material: Plastic
Body Material: Composite
Color: Black
Warranty: 2 years
Model Number: 100790
Included: Kettlebell, 2-month free JRNY membership trial
Who Should Buy This? The SelectTech 840 is ideal for home gym builders, apartment dwellers, seniors seeking low-impact strength training, busy professionals wanting convenient workouts, and anyone who values space efficiency. It works well for beginners through intermediate fitness levels.
Who Might Want to Look Elsewhere? Advanced strength athletes seeking weights above 40 lbs should consider heavier kettlebells or adjustable dumbbell alternatives. Those with very large hands might prefer kettlebells with thicker handles. Fitness purists who prefer traditional kettlebells over adjustable designs may not appreciate the dial mechanism.
Space and Setup Considerations: The compact footprint makes it suitable for bedrooms, small apartments, and shared living spaces. It requires minimal storage and can be used in nearly any room. No installation or assembly is needed, and it's portable enough to travel with for maintaining workout consistency on the go.
Value Assessment: At the current price point, this kettlebell replaces six separate kettlebells, making the per-weight cost highly economical. When combined with the 2-month free JRNY trial and 2-year warranty, the overall value proposition is strong for home fitness investment.
Buying Guide
Weight Range and Adjustability
The BowFlex SelectTech 840 covers a wide weight range from 8 to 40 pounds, with six distinct settings. This allows you to progress through exercises without needing multiple kettlebells. The dial mechanism is smooth and secure, letting you switch weights in seconds between sets.
When choosing an adjustable kettlebell, consider the weight increments that match your training goals. A broader range like this one supports both beginners and intermediate lifters.
Ease of Use and Design
The turn-of-a-dial design eliminates the need for changing plates or storing multiple kettlebells. The compact base keeps the kettlebell stable during exercises like swings and rows. The handle is ergonomic and comfortable for both one- and two-handed movements.
This space-saving design is ideal for home gyms where floor space is limited. You can store it on a shelf or in a closet when not in use.
Build Quality and Durability
The BowFlex SelectTech 840 features a robust construction with a metal frame and a durable outer coating. The weight plates are encased securely, and the dial mechanism has been verified to withstand frequent adjustments. This kettlebell is built to last through years of regular use.
Durability is critical for dynamic movements like swings and cleans. The solid build ensures that the kettlebell remains balanced and doesn’t wobble.
Versatility for Full-Body Workouts
With six weight settings, this kettlebell supports a wide variety of exercises, including swings, squats, rows, twists, and presses. The dial allows you to quickly change resistance between exercises, keeping your workout efficient and varied. It is suitable for strength training, cardio, and mobility work.
Whether you are a beginner or an experienced athlete, the BowFlex SelectTech 840 adapts to your needs. For more fitness category insights, visit our Sports & Fitness page.
Final Thoughts
In summary, the BowFlex SelectTech 840 adjustable kettlebell stands out for its dial system and compact design, making it our top pick for home workouts. For most users, we recommend the BowFlex SelectTech 840 for its versatility and ease of use. If you need a lighter starting weight, the BowFlex SelectTech 840 also begins at 8 pounds, covering a broad range of fitness levels. This single piece of equipment can replace up to six traditional kettlebells, saving both space and money.
Frequently Asked Questions
How does the dial adjustment work on the BowFlex SelectTech 840?
The dial mechanism rotates to select one of six preset weights. When you turn the dial, the internal locking system engages the corresponding weight plates. This process takes just a few seconds and is secure during use.
What is the weight range of the BowFlex SelectTech 840?
The kettlebell adjusts from 8 to 40 pounds in increments of 8, 12, 20, 25, 35, and 40 pounds. This range accommodates a variety of exercises and fitness levels, from light warm-ups to heavier strength training.
Is the BowFlex SelectTech 840 durable enough for daily use?
Yes, the BowFlex SelectTech 840 is built with high-quality materials and has been validated through extensive use. The metal frame and secure dial mechanism ensure it withstands repeated swings and drops. For more durable fitness gear, see our best kettlebells guide.
Can I use the BowFlex SelectTech 840 for exercises like swings and squats?
Absolutely. The kettlebell is designed for full-body movements including swings, squats, rows, and overhead presses. The handle is comfortable for both one-handed and two-handed grips, making it versatile for dynamic and static exercises.
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