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.
Pros
- Quick-dial adjustment system saves time between sets and exercises
- Exceptional space-saving design ideal for apartments, condos, and compact home gyms
- Durable metal construction with reliable locking mechanism prevents weight slippage
- Comfortable, non-slip handle reduces hand fatigue during extended training sessions
- Included storage trays maximize organization and accessibility
Cons
- Higher initial investment compared to traditional fixed-weight dumbbells
- Dial adjustment mechanism may require occasional maintenance over years of heavy use
- Weight range tops out at 52.5 pounds per dumbbell, which may limit advanced powerlifters
The BowFlex SelectTech dumbbells are adjustable weight dumbbells designed for home gym owners who value convenience and space efficiency. They're perfect for anyone from fitness beginners to intermediate lifters who wants a complete dumbbell solution without the clutter of multiple weight sets.
The standout feature is the quick-twist dial system that lets you adjust weight from 5 to 52.5 pounds instantly. This means you can perform supersets and drop sets without wasting time swapping equipment. The ability to replace 15 separate dumbbells with one compact pair makes these invaluable for anyone with limited space, whether you're working out in a bedroom, garage, or small apartment.
Build quality is solid with premium metal plates and a reinforced locking mechanism that keeps weights secure during intense movements. The ergonomic, non-slip grip provides excellent control and comfort, reducing hand strain during longer training sessions. The included storage trays help keep your workout area organized and the dumbbells easily accessible.
The main limitation is the price point, which is higher than traditional dumbbells. Additionally, the 52.5-pound maximum per dumbbell may feel light for advanced strength athletes performing heavy compound movements. The dial mechanism, while reliable, could potentially need maintenance over many years of frequent use.
Overall, the BowFlex SelectTech dumbbells deliver excellent value for home gym enthusiasts seeking convenience, space savings, and versatile weight options in one package. The strong 4.7-star rating reflects genuine user satisfaction with performance and durability.
Weight Range: 5 to 52.5 pounds per dumbbell
Adjustment Mechanism: Quick-twist dial system
Construction: Premium metal plates with reinforced locking system
Grip: Ergonomic, non-slip handle
Included Accessories: Storage trays and 2-month JRNY app access
Set Contents: One pair of adjustable dumbbells (replaces 15 traditional weights)
Customer Rating: 4.7 out of 5 stars
Ideal For: Home gym owners with space constraints, fitness enthusiasts seeking workout variety, beginners building a home gym, intermediate lifters wanting convenient weight adjustment, apartment dwellers and condo residents, people who prefer organized workout spaces.
Not Ideal For: Advanced powerlifters requiring weights above 52.5 pounds, users with extremely tight budgets, those who prefer traditional fixed-weight dumbbells, people with very limited counter or shelf space even for storage trays.
Best Use Cases: Full-body strength training, circuit workouts, drop sets and supersets, rehabilitation and physical therapy exercises, progressive overload training programs.
Pros
- Exceptional build quality with no rough seams or wobble, matching commercial gym standards
- Smooth, textured handle design provides secure grip during dynamic movements and high-rep sets
- Versatile training tool for strength building, explosive power development, and core conditioning
- Thoughtful design details like color-coded rings and consistent sizing across the lineup
- Backed by positive customer feedback praising durability, finish quality, and value proposition
Cons
- Higher price point compared to budget kettlebell brands, though justified by premium construction
- Limited color options available, primarily yellow for this weight class
- Requires adequate storage space despite compact design when building a complete kettlebell collection
The REP Fitness 16kg kettlebell is a gravity-cast iron training tool designed for serious home gym builders, CrossFit athletes, and functional fitness enthusiasts. This single bell serves as an excellent starting point or mid-range addition to an existing kettlebell collection, offering professional-grade construction at home-gym pricing.
What sets this kettlebell apart is its premium textured matte finish combined with a wide 1.25-inch handle diameter. The finish provides exceptional grip security during explosive movements like swings and snatches without causing hand tears, even after hundreds of repetitions. The wider handle accommodates various grip styles and hand sizes, making it accessible for both beginners learning proper form and advanced athletes performing complex movements.
Build quality is exceptional throughout. Gravity casting ensures precise weight accuracy and consistent sizing across REP's entire kettlebell lineup, eliminating the wobble and imbalance common in cheaper alternatives. The rust-resistant coating protects the cast iron from corrosion, while color-coded base rings enable quick identification when training with multiple weights. No rough seams or casting imperfections detract from the clean, professional appearance.
The primary limitation is cost. REP Fitness kettlebells command premium pricing compared to budget brands, though customer reviews consistently validate this investment through superior durability and finish quality. Storage space becomes a consideration if building a complete set, though kettlebells remain more compact than most home gym equipment.
Verdict: This is a legitimate gym-quality kettlebell for serious trainees willing to invest in equipment that lasts. The 16kg weight works well for intermediate strength training, explosive power development, and high-rep conditioning circuits. Highly recommended for functional fitness training and long-term home gym building.
The 16kg kettlebell is ideal for intermediate training and works across multiple training modalities. For strength building, use it for goblet squats, single-arm presses, and single-leg deadlifts to develop unilateral power and core stability. For explosive power, kettlebell swings, cleans, and snatches build posterior chain strength and cardiovascular conditioning in minimal time.
Functional fitness circuits can combine kettlebell movements with bodyweight exercises for full-body conditioning. Try alternating kettlebell swings with push-ups, or Turkish get-ups with farmer carries for complete movement patterns. The 16kg weight provides sufficient resistance for most intermediate athletes while remaining manageable for high-rep conditioning work.
Beginners should start with lighter weights to master movement patterns before progressing to 16kg. Advanced athletes often use this weight for high-rep sets, unilateral movements, or as part of a tiered training system combining multiple kettlebell weights for different exercises.
Weight: 16kg (35 pounds)
Color: Yellow with color-coded base ring
Material: Cast iron with textured matte finish
Handle Diameter: 1.25 inches
Special Features: Rust-resistant coating, wide handle, gravity cast construction
Recommended Uses: Strength training, functional fitness, CrossFit, full-body conditioning, cardio conditioning
Brand: REP Fitness
Manufacturer: REP Fitness (Denver-based)
Available Sizes: 1kg, 4kg, 6kg, 8kg, 10kg, 12kg, 16kg, 18kg, 20kg, 22kg, 24kg, 28kg, 32kg, 36kg, 40kg, 44kg, and 48kg
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.
