8 Best Adjustable Kettlebell Picks Rateds for Grip and Load

Quick Comparison

How to Choose

• Measure the handle window, not the handle. The dimension that decides whether a bell is usable is the open space between the grip and the body. Under about 2.5 inches of clearance, a gloved or large hand gets pinched during racked holds. The 840’s window is generous enough for two bare hands side by side, which is the real test for two-hand swings.
• Interrogate the locking mechanism under reversal, not at rest. Any adjustable bell feels solid standing still. What matters is the moment a swing changes direction and the plates want to keep traveling. Set the bell to a mid-range number, do ten hard swings, then listen. Silence is good; a repeating tick means the selector is taking load it was not designed to take.
• Check the spacing of the jumps, not just the top number. Marketing highlights the maximum. Training lives in the gaps. The 840 steps 8, 12, 20, 25, 35, 40 — that is a 4-pound jump, then an 8, then a 5, then a 10. The 25-to-35 gap is the one that stings when you are progressing presses, and there is no half-step to hide in.
• Respect the base. Selectorized bells carry their adjustment hardware on the bottom, so they need to be set down deliberately on a flat surface. If your training space is tile or thin laminate, budget for a rubber mat before you budget for anything else.
• Match the tool to the movement. Adjustable bells are excellent for high-repetition ballistics and unilateral work in a small space. They are the wrong tool if your plan involves dropping the bell on every set or loading past 40 pounds for double-bell front squats. Know which athlete you are before you buy.

Top Picks Reviewed

BowFlex SelectTech 840 Adjustable Kettlebell

The 840’s defining feature is the dial at its base. Rest the bell on the floor, twist to the number you want, lift, and the plates you did not select stay behind in the cradle. It takes about as long as reaching for a different bell on a rack, which means it actually gets used mid-workout instead of being treated as a one-time setup. That single detail is what separates a genuinely adjustable bell from a bell you set once and never touch again.

On grip, it earns high marks with one asterisk. The handle is smooth molded material rather than knurled cast iron, with a window wide enough that two palms fit comfortably for swings and a single hand has room to rotate through a clean. Nothing here tears skin, which matters if you train barehanded five days a week. The asterisk: smooth means slick. Once your hands are genuinely wet, high-rep single-arm sets get sketchy, and chalk does less for a polished surface than it does for knurl. Keep a towel within reach.

On load, the bell holds up better than the category’s reputation suggests. Through swings, goblet squats, rows, presses, and carries, the plates stay quiet and the mass sits close enough to the handle that the bell tracks predictably through the bottom of a hinge. The honest limitations are geometric rather than mechanical. The body is squarer and flatter than a traditional bell, so cleans and snatches land on the forearm with a broader, blunter contact patch — noticeable at 35 and 40 pounds, and worth some deliberate practice at lighter settings first. And 40 pounds is a real ceiling. For most people running conditioning circuits and accessory work, it is plenty for a long time. For anyone whose two-hand swing is already comfortable at 40, this is not the purchase to make.

Who it is for: someone with limited floor space who wants six usable weights, values fast changes between exercises, and trains in the 8-to-40-pound band. Who it is not for: heavy competition-style lifters, anyone doing sets that end with the bell hitting the floor, and outdoor or gym-share environments where equipment gets treated roughly.

Frequently Asked Questions

Can you drop an adjustable kettlebell?

No. Every selectorized bell, including this one, relies on plates held by a mechanism rather than a single cast piece. Impact is what loosens that mechanism. Train the habit of guiding the bell down to the floor with two hands. If your program depends on dropping, buy a cast-iron bell.

Is 40 pounds enough to keep progressing?

For a long stretch, yes — especially for presses, rows, single-leg work, and carries, where 40 pounds in one hand is substantial. Two-hand swings will outgrow it soonest. When that happens, the usual move is to shift to single-arm swings, slow the tempo, or add volume rather than replacing the bell immediately.

How does the handle compare to a traditional cast-iron bell?

Wider and smoother. The width is a genuine advantage for two-hand work and for anyone with large hands. The smoothness is a trade: kinder to your palms across high volume, less secure when sweat enters the picture. Neither is strictly better; it depends on whether you are more limited by skin or by slip.

Does the weight change quickly enough for circuit training?

Yes, and this is the strongest practical argument for the 840. Going from 20-pound swings to 35-pound goblet squats is a twist of the dial, so you can run a real circuit without stockpiling bells. It is slower than grabbing a pre-set bell off a rack, but only by a few seconds.

Final Thoughts

The BowFlex SelectTech 840 is the rare space-saving product that does not feel like a downgrade in daily use. It grips comfortably, changes weight fast enough to keep a session moving, and stays quiet through the kind of ballistic work that exposes cheaper adjustable designs. Its limits are clearly drawn: a 40-pound ceiling, uneven jumps around the 25-to-35 mark, a flat-faced body that takes some getting used to on cleans, and zero tolerance for being dropped. If those boundaries match how and where you train, it replaces a full rack for a fraction of the space and money. If they do not — if you are already swinging heavy or training somewhere the bell will get abused — spend the same budget on two or three cast-iron bells and skip the mechanism entirely.