BYZOOM FITNESS Classic Series 50/55LB Adjustable Dumbbell Pair Set of 2 OR Single Unit (Check qty before purchase), 5-in-1 OR 15-in-1 Patented Secure System, Solid Cast Iron Core, Iconic 12-Sided Polygonal Anti-Roll Base, Professional Heavy Weight for Men and Women, Black
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Availability:
In Stock.
Arrives
Thursday, Sep 10
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Size: 55LB Pair
Number of Items: 2
Features
- ULTIMATE 15-IN-1 PRECISION: The 55LB Classic Series features dual 2.5LB removable micro-plates, giving you 15 precise weight increments to master progressive overload and break through strength plateaus. Buy One Set, Use Longer. Best Value for Home or Garage Gym.
- FORGED CAST IRON DURABILITY: We use high-density, nylon-shielded cast iron to deliver a compact, balanced feel and a solid impact that wont rattle or crack during high-intensity sessions.
- STABLE 12-SIDED POLYGONAL BASE: Our classic polygonal plates provide a rock-solid, stationary foundation. Use the weights as a stable platform for renegade rows and floor push-ups without the instability or rolling risk of round dumbbells.
- ADJUSTABLE LENGTH: Most adjustables stay bulky even at light weights. Our high-density iron allows the dumbbell to physically shorten from 15.94" to 6.65" as you drop weight, ensuring a natural range of motion that won't bump your body.
- PATENTED DUAL-LOCK SECURITY: Train with the confidence of a 3x World Champion. Our patented safety dovetail mechanism secures the main plates, while the secondary rotation lock keeps micro-plates tight for a silent, rattle-free experience during explosive lifts.
Description
DOMINATE YOUR HYPERTROPHY. NO COMPROMISE. The BYZOOM FITNESS Classic Series 55LB is engineered for the man who understands that small gains lead to massive results. By integrating two removable 2.5LB micro-plates into our industrial-grade cast iron frame, we’ve created a 15-in-1 tool that offers more precision than any other adjustable in its class. ENGINEERED FOR CHAMPIONS Tested and trusted by WNBF 3x World Champion Zack, this gear is built for the grind. While other brands use bulky composite fillers, we utilize nylon-coated cast iron for a shorter, tougher, and better-balanced dumbbell that survives years of heavy drops. PRECISION AT SPEED The 1-second weight change system allows you to jump between main weight levels instantly, while the micro-loading dials let you fine-tune your resistance. It is the ultimate space-saver, replacing a 15-piece commercial rack with one mission- focused unit. TECHNICAL SPECIFICATIONS: Material: High-Density Nylon-Shielded Cast Iron Weight Range: 10 LB to 55 LB (15 Levels) Form Factor: 12-Sided Polygonal Anti-Roll Base Micro-Adjust: Dual 2.5 LB Removable Plates Safety: Patented US/EU/Asia Dovetail System
Brand: ByZoom Fitness
Color: 55LB Pair Black
Item Weight: 110 pounds
Material: Cast Iron
Special Feature: Adjustable Weight, No-Roll Head, Rust Resistant, Sweat Resistant, Unbreakable
Brand Name: ByZoom Fitness
Set Name: Classic Series 55LB Set of 2
Number of Items: 2
Manufacturer: BYZOOM FITNESS
Part Number: ADB-55LBX2-BYZF
Other Special Features of the Product: Adjustable Weight, No-Roll Head, Rust Resistant, Sweat Resistant, Unbreakable
Item Weight: 110 pounds
Item Dimensions L x W: 16.54"L x 7.87"W
Handle Diameter: 9.4
Number of Pieces: 2
Grip Size: Standard
Color: 55LB Pair Black
Style: Adjustable
Material: Cast Iron
Handle Material: Alloy Steel
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Sep 10
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 50LB Single Unit
Number of Items: 1
Didn’t initially think that I would like an adjustable dumbbell, but I like this one. It’s very compact vs the others in this price range, and only gets longer (wider?) as the weight goes up - instead of a fixed width like many other brands. That makes it feel much more like the same size as a stand alone individual dumbbell at that size. It seems well made and is easy to adjust. I use it for 20, 30, 40, and 50lbs in the same workout, and it is as easy to use as grabbing a new weight off of the rack.
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Reviewed in the United States on July 21, 2026 by T. Cooper
Size: 55LB Pair
Number of Items: 2
Theses adjustable dumbells are great. You can adjust the weight in 1.25 lbs increments up to 55lbs. Most DB's can not be adjusted in this small of an amount. They are a must for a home gym. I did label them so I know how much weight is being used easily (see photo) . I would buy these again and recommend them to a friend. I have nothing to do with the seller and paid for my DB's myself.
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Reviewed in the United States on July 15, 2026 by D Poole
Size: 55LB Pair
Number of Items: 2
really satisfied with this purchase. i've wanted one of these for years but couldn't justify it since i have other dumbbells but this seemed like a good deal so i impulse bought it and very happy i did. it comes with a stand which is a must-have in my opinion. the functionality is smooth and easy to use. the best part is that it each dumbbell has four 1 1/4 lb plates which gives these a tremendous amount of micro weight-adjustment ability between 10 and 55 lbs. i'm already using these way more then my other dumbbells (which i wasn't really using at all anymore because i do my main workouts at the gym) but i have a hard time walking past these without doing some curls or lateral raises or something or watching tv and working out without having to screw and unscrew on different weight plates like the standard dumbbells have.
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Reviewed in the United States on June 2, 2026 by Babak Ghaemian
Size: 55LB Single Unit
Number of Items: 1
Fantastic affordable dumbbell! This dumbbell stands out from the rest around the $150-$250 (single) price range by offering: - Dynamic sizing: dumbbell is smaller at lighter weights and not always full length and unwieldy like many others - Some 2.5lb increments - Large flat ends - easy to rest on thighs and move into place to start a set - Fast and smooth changing mechanism - Balanced feel in the hand - Minimal rattle/noise during use, very secure plates - Solid weight range of 10-55lbs - Iron plates and reasonable durability for the price It uses a simple adjustment mechanism where you just pull the adjustment tab up and then slide to the desired weight slot on both sides of the dumbbell. This gives you 10-50lb in 10lb increments very quickly and locks in with a satisfying click. Then inside the handle you've got 2 adjustment knobs (one on each side) to engage either one or two 1.25lb adder plates that give you 2.5lb or 5lb increments on top of those 10lb main increments. Also very tactile and easy to feel. The shape of the plates/dumbbell is helpful to prevent rolling. Only things holding it back from 5 stars is: - Lack of 7.5lb increment weights (ex: it goes 10, 12.5, 15, 20 - no 17.5lb weight). Seems like this could be fixed by changing the small adder plates to be 1.25 and 2.5lb per-side on each dumbbell rather than just 2x1.25lbs. Then the adjustment mechanism can engage only the 1.25lbs, 2.5lbs, or both to give you 2.5lb, 5lb, or 7.5lb increments. - Minor difficulty placing dumbbell back into cradle when not using 2.5lb or 5lb increments. Since the adder weights are still there they can easily get knocked over when placing a heavy dumbbell back. - Weight labels are on the cradle and don't line up perfectly with the 10lb adjustment increment slots. - Labels are also a bit far which makes it hard to tell which weight you're choosing. If they were closer to where you slide the adjuster or even labeled on the dumbbell themselves that would be ideal. - Handle is not knurled and just plastic not metal, not the best feeling but it works - 10lb increment adjustment tab sticks out and can bump you during some exercises like deep presses, would be nice if it rested flush with the body of the weight plates - Offer a heavier 75lb+ version - Dumbbells are a bit large, but this is typical for adjustables Some of these downsides are addressed in the ByZoom Pure Series which I think is a slight upgrade over this Classic model, but they don't seem to offer a 55lb Pure variant anymore. If you can afford it, I think the 75lb Pure model is basically the best budget adjustable dumbbell out right now (mid-2026). Overall though this is still one of the best affordable adjustable dumbbells on the market, gives you the advantages of more expensive offerings like the NordicTrack Select-a-Weight or Core Fitness while costing less.
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Reviewed in the United States on May 15, 2026 by Marissa
Size: 55LB Pair
Number of Items: 2
Very easy to use and you save a lot of time comparing to keep changing weight plates during your home gym session.
Reviewed in the United States on July 3, 2026 by El equipo llegó rápido y en perfecto estado. El vendedor muy comunicativo y amable.
Size: 50LB Single Unit
Number of Items: 1
These are the cheapest adjustable dumbbells I could find. The one I bought ranges from 10 lb to 50 lb, but you could do half-way increments 15, 25, 35, and 45 if you select one side to be higher than the other. This will give you an imbalanced dumbbell. At least the option is there if balance doesn't matter much for the specific exercise. The weights jostle slightly when in use, and I'm a bit concerned about accidentally pulling the tab during exercise and dropping a plate. This product does not have a "dock lock" where the dumbbell needs to be docked to unlock the weights. So far, my workaround has been to rotate the dumbbell such that the pull tabs face away from the body and clothing such that it's highly improbable to accidentally loosen a plate. The plates are lubricated, and I assume you'll need to apply lubrication if sliding becomes stiff at some point. Packaging used styrofoam and seems adequate. Overall I'm happy with this product.
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Reviewed in the United States on March 7, 2026 by Enza9
Size: 55LB Single Unit
Number of Items: 1
This review is for the BYZOOM FITNESS classic series 50/55LB adjustable dumbbell The weight selection on this is genuinely smooth, locks in tight every single time with zero rattling once set, and switching between weights mid workout takes seconds so you are not standing around losing your pace between exercises. I ended up using the full range rather than sticking to just a couple of settings, which says a lot about how useful the increments actually are for progressive overload. Cast iron core feels solid and balanced, finish came out clean with nothing chipped or off looking. This honestly feels commercial grade even though I am using it at home, which makes it a great fit for an office, a locker at work, or a smaller living space where you do not have room for a full rack of fixed dumbbells. In a bigger commercial gym setting with a lot of people cycling through, regular fixed weights might still make more sense just for traffic flow, but for individual or limited space use this excels. The 12 sided base genuinely stops it from rolling and it sits flat and stable every time you set it down, which makes it useful for floor work like rows or skull crushers where you need it to stay put between reps. Grip feels comfortable at every weight setting, good diameter, no slipping issues even with sweaty hands. Used this across curls, presses, rows and lunges, loading the entire unit at different points, and it stayed balanced through full range of motion with no shifting or clunking during dynamic movement. Never once felt unsafe or worried about plates coming loose mid set, the locking system inspires real confidence. I only picked up a single unit for now but I am already considering grabbing a second to have a matched pair. For the price, especially if you are dealing with limited space like an apartment, this is a strong value and a smart space saving alternative to a full rack. I would not call it a total replacement for a complete weight set in every situation, but as an addition to a home gym it absolutely earns its spot. Would definitely buy again.
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Reviewed in the United States on June 24, 2026 by K
Size: 55LB Single Unit
Number of Items: 1
I've been lifting for over a decade and have owned everything from cheap plastic-coated dumbbells to expensive rack systems that ate up half my garage. The BYZOOM FITNESS Classic Series 55LB Adjustable Dumbbell has fundamentally changed how I think about home gym equipment — and not just because it works, but because it works brilliantly. Build Quality and Design The moment you pick this up, the solid cast iron core tells you everything you need to know about its construction. There's no hollow feeling, no flex, no rattle — just dense, reassuring weight that feels like it's built to outlast everything else in your gym. The matte black finish is understated and professional, and after several months of regular use it still looks sharp with no chipping or fading. The 12-sided polygonal anti-roll base is one of those design decisions that sounds minor on paper but becomes indispensable in practice. Set it down on a bench, the floor, or a rack and it stays exactly where you put it. No more chasing a dumbbell that's rolled under the bench mid-set. The Patented Secure System BYZOOM's 5-in-1 adjustment system (on the 55LB configuration) is fast, intuitive, and — most importantly — secure. The locking mechanism clicks into place with a satisfying firmness that inspires confidence. I've done everything from controlled slow-tempo sets to explosive movements and the weight has never shifted or felt unstable. That security is the single biggest thing that separates this from lesser adjustable systems where you're constantly second-guessing the lock. Weight Range and Versatility Covering five distinct weight increments up to 55 pounds, this single dumbbell replaces an entire rack of fixed weights. Warm-up sets, hypertrophy work, strength progressions — everything is covered. Transitioning between weights takes seconds, which keeps rest periods tight and workouts efficient. Real-World Daily Use My typical session: grab the dumbbells, dial to a lighter weight for warm-up, bump up for working sets, drop back down for burnout volume at the end. The adjustment system is smooth enough to do this between sets without breaking rhythm. I use these for presses, rows, curls, lateral raises, Romanian deadlifts, and goblet squats — they perform flawlessly across all of it. Space Savings I replaced a 10-dumbbell rack with two of these. The footprint is about the size of a shoe box per dumbbell. For anyone training in an apartment, spare bedroom, or modest garage gym, that space recovery is genuinely life-changing. Minor Considerations At heavier weights, the dumbbell is somewhat longer than a fixed dumbbell of equivalent weight, which can feel slightly different on exercises like dumbbell bench press where the ends may contact your thighs on the way up. It's an easy adjustment and becomes second nature quickly. Also, the 55LB ceiling may eventually feel limiting if you're an advanced lifter pressing heavy — but for the vast majority of home gym users, it's more than sufficient. Value Assessment Quality adjustable dumbbells are not cheap, and the BYZOOM sits at a fair price point for what it delivers. Compare it against buying even a modest fixed dumbbell rack and the math favors the BYZOOM decisively — both in cost and in space. For a long-term home gym investment, this is money well spent. Final Verdict The BYZOOM FITNESS Classic Series 55LB Adjustable Dumbbell delivers on every front: premium materials, a secure and fast adjustment system, an anti-roll base that's more useful than it sounds, and enough weight range to support a complete training program. It's the kind of equipment that makes you wonder why you waited so long to buy it. Recommendation: Strong Buy for anyone building or upgrading a home gym. Whether you're a beginner or a seasoned lifter, this is the dumbbell set to get.
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Reviewed in the United States on April 6, 2026 by Penny Pen