Prices verified May 26 · Always confirm at the retailer before buying.
What's the best pick for 2026
- Best for Kettlebell Training:BowFlex SelectTech 840—$130→
- Best for Heavy Lifting:CAP Barbell Set—$287→
Pros:
- Turn dial adjusts weight in seconds
- Saves space, replaces 6 kettlebells
- Includes 2-month free JRNY membership
Cons (honest weight):
- Max 40 lbs may be too light for advanced users
- Handle diameter 1.10 inches may feel small
- Premium price at $129.99
Pros:
- High weight capacity up to 105 lbs per pair
- Rust-resistant epoxy coating
- Secure star-lock collars with rubber O-rings
Cons (honest weight):
- Assembly required (plates and collars)
- Not as quick to adjust as dial systems
- Handle diameter 1-1/8 inch may not fit standard plates
Choosing between the BowFlex SelectTech 840 and the CAP Barbell Adjustable Dumbbell Set depends on your training style and space. The BowFlex is a kettlebell that adjusts from 8 to 40 lbs with a simple dial turn. The CAP Barbell is a traditional dumbbell set with 105 lbs per pair using plates and collars.
BowFlex vs. CAP Barbell at a Glance
| Feature | BowFlex | CAP Barbell |
|---|---|---|
| Weight Range | 8-40 lbs | 105 lbs per pair |
| Adjustment | Turn dial | Star-lock collars |
| Material | Composite | Alloy Steel |
| Price | $129.99 | $286.99 |
| Rating | 4.8/5 (7,621 reviews) | 4.4/5 (7,287 reviews) |
| Warranty | 2 years | 30 days |
BowFlex excels in ease of use and compactness. The dial mechanism lets you switch weights in seconds. It stores in a small footprint, making it ideal for apartments or home gyms with limited space. However, the composite handle feels less robust than steel, and the 40 lb maximum may limit heavy lifters.
CAP Barbell offers greater weight capacity at a lower cost per pound. With 105 lbs per dumbbell, you can progress to heavy presses and rows. The epoxy coating resists rust, and the knurled handles provide a secure grip. The trade-off is manual plate changes and handles that only accept the included plates.
Which should you buy?
Choose the BowFlex if you prioritize speed and space. It’s perfect for quick circuits and dynamic kettlebell movements. The 2-year warranty adds peace of mind.
Choose the CAP Barbell if you need more weight and prefer traditional dumbbells. Despite the assembly, it offers the best value for heavy lifting at home.
Our analysis covers 14,908 Amazon reviews and expert sources like Wirecutter. Both products are solid fits for home gyms. The BowFlex is our top pick for versatility and ease; the CAP Barbell takes the lead for raw strength training.
Frequently Asked Questions
Which adjustable dumbbell is better for beginners?
The BowFlex SelectTech 840 is easier for beginners due to its simple dial adjustment and lighter weight range. It eliminates the need to handle plates and collars.
Can I use standard Olympic plates with the CAP Barbell set?
No, the handles have a 1-1/8-inch diameter and only accept the included plates. Standard 1-inch or 2-inch plates won't fit.
How much space does each option take?
The BowFlex is compact, roughly the size of a single kettlebell. The CAP Barbell comes with 24 plates and two handles, requiring more storage space.
Is the BowFlex suitable for heavy lifting?
Not above 40 lbs. For heavy compound lifts like rows or overhead presses, the CAP Barbell offers up to 105 lbs per dumbbell.
Who wrote this and where's the data from?
Mubboo Editorial Team — independent US-market consumer research. Picks reflect editorial consensus from 3 independent review sources and 14,908 verified buyer reviews.