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Adjustable kettlebells: how the designs differ and how to pick the right range

By the Life in Good Form editors. Updated 2026-10-14.

We research products from makers' specs and health sources; we do not run hands-on tests. Links to Amazon may earn us a commission at no cost to you. How this works.

Types of adjustable kettlebell

Compare these mechanisms without assuming one category is always stronger, smaller or quicker. Ironmaster, for example, specifies its own Quick-Lock plates and screws for its handle. Owning ordinary weight plates does not establish that they fit.

A fixed bell is another option if you do not need adjustment. See the kettlebell guide for that choice. It avoids a weight-selection procedure, but this is not proof that every fixed bell is more durable than every adjustable model.

Compare the actual settings and included parts

The Bowflex SelectTech 840 manual lists six nominal settings: 8, 12, 20, 25, 35 and 40 lb. The manual notes that exact weights can vary with manufacturing tolerances. The steps are uneven: 8 to 12 lb is a 4 lb increase, while 25 to 35 lb is a 10 lb increase.

Check the gaps where you expect to train. A headline range does not tell you whether there is a manageable next setting for a particular exercise. Your starting and working loads should follow your technique and training plan, rather than an assumption that the lowest setting suits every beginner.

Bells of Steel's cited base package includes a 12 kg shell and plates that bring the total to 20.5 kg, plus an Allen key and wrench. Its listed plates include 0.5 kg and 1 kg pieces. Do not assume a higher range pictured or advertised elsewhere is included in that base package; confirm the selected bundle and any expansion parts.

For a handle-only system, check the listing contents separately from the maximum possible assembled weight. Ironmaster says its cited handle is sold without plates or locking screws. A compatible handle is not necessarily a complete training set.

Check size, grip and changeover procedure

Read the dimensions for the exact version you are considering. The cited Bowflex manual lists 8.8 by 7 by 12.6 inches. That is the product dimension stated in that manual, not a measurement of all adjustable bells or a guarantee that it will sit comfortably against your forearm.

Consider how you will grip and position the bell during the exercises you have learned. Handle clearance, the shell shape and access to the adjustment hardware can matter. Do not infer comfortable cleans or presses from the weight range alone. Ask about a fit or handling demonstration if the published information does not answer your question.

Read the adjustment steps before choosing a format for a circuit. The Bowflex requires its base for selection; the Bells of Steel base package supplies tools for changing its internal plates. A workout that allows time between loads may suit either. Do not rush a fastening check to keep up with a timer.

Follow the locking and handling instructions

The Bowflex manual says to inspect the kettlebell before each use and periodically perform its full locking-mechanism test. Seat the handle completely in the base before selecting a weight. The selected number must align properly; lift and return the bell vertically rather than tilting it through the unselected plates.

Its manual warns against forcing the selector when the bell is outside the base, changing the stacked plate order, dropping the bell or using the handle as a support for pushups. Dropping can damage the weight plates or lock and allow plates to detach. A floor mat does not remove that restriction.

Follow the full test procedure in the manual for your model. If the mechanism fails its test or parts are worn or damaged, stop using the bell and contact the manufacturer for service. Do not copy a different model's locking test or improvise a repair.

Allow the exercise clearance specified by your manual and keep children and pets away. The cited Bowflex is for home use and should not be operated outdoors or in wet locations. Store it securely when it is not in use.

Learn the movement before increasing the load

Mayo Clinic advises working with a trainer or fitness specialist to learn correct strength-training technique if you are new to it. Warm up before training and stop an exercise that causes pain. A product buying guide cannot check your technique or establish that a swing or overhead movement is suitable for you.

Its general advice about repetitions is not a kettlebell swing protocol. Have your program account for the movement, experience and available weight steps. Do not assume a heavier setting is appropriate just because a different exercise felt easy.

CDC recommends muscle-strengthening activity on at least 2 days each week, covering all major muscle groups, alongside aerobic activity such as 150 minutes of moderate activity weekly. This is broad adult guidance, not a requirement to perform kettlebell swings for that duration. Mayo advises a full day of recovery between exercising the same specific muscle group.

What to look for when you buy

Questions people ask

Are adjustable kettlebells useful for a small home gym?

They can consolidate several load choices in one system. Compare the complete bell and base footprint, included weights and adjustment procedure with your space and routine.

What weight range should an adjustable kettlebell have?

Choose a starting load and next steps that match the movements you can perform with good technique. A broad range is less useful if its lowest setting is unsuitable or the next step is too large.

Can you swing an adjustable kettlebell?

Check that your exact model permits the planned movement, follow its locking instructions and learn technique from a qualified trainer. Do not assume that all adjustable handles and mechanisms have the same permitted uses.

Can I use weight plates I already own?

Only if the maker lists the exact plates and locking hardware as compatible. Some handles use a proprietary system, and a handle-only purchase may exclude the necessary plates and lock.

What should I do if the selector or lock behaves oddly?

Stop using the equipment. Follow the manual's inspection and service instructions rather than forcing the mechanism or attempting an unapproved repair.

Sources

• SelectTech 840 Kettlebell Owner's Manual (download.bowflex.com), Bowflex
• Adjustable Competition Kettlebell (bellsofsteel.us), Bells of Steel
• Quick-Lock Adjustable Kettlebell Handle 22.5 LB (ironmaster.com), Ironmaster
• Strength training: Get stronger, leaner, healthier (mayoclinic.org), Mayo Clinic
• Adult Activity: An Overview (cdc.gov), CDC

Sources checked 2026-10-14.