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Side-by-side comparison of NÜOBELL 580 Adjustable Dumbbells, BowFlex SelectTech 840 Adjustable Kettlebell

	NÜOBELL 580 Adjustable Dumbbells Best Premium Check price on AmazonBuy from the brand	BowFlex SelectTech 840 Adjustable Kettlebell Best Kettlebell Check price on AmazonBuy from the brand
FR Score	8.6FR Score 8.6 out of 10, ExcellentTOP	8.3FR Score 8.3 out of 10, Great
Build Quality & Durability	7.9 (best)	7.6
Performance & Feel	9.5 (best)	7.9
Ease of Use & Footprint	9.2 (best)	9.1
Value for Money	7.8	8.7 (best)
Typical price	~$769	~$149
Video reviews	4 videos	3 videos
Pros	Feels closest to a fixed dumbbell, with flat heads and a knurled aluminum handle Twist-handle changes rank among the fastest in the category Wide 5–80 lb range in even 5-lb steps	One dial covers six weights from 8 to 40 lb Fastest weight changes of any kettlebell style Reasonably priced at about $149
Cons	Premium price: about $769 for the 80-lb pair Plastic internal parts are the known weak point; not drop-safe 5-lb jumps are coarse for light isolation work	Plastic shell isn't meant to be dropped Taller, more oval shape than a traditional kettlebell 28 mm handle is thinner than standard bells
Weight range	5–80 lb per dumbbell	8–40 lb
Increments	5 lb (16 settings)	—
Adjustment	Twist handle in cradle	Dial selector with storage base
Replaces	16 pairs of dumbbells	6 kettlebells
Plates	Powder-coated cast iron	—
Handle	Knurled anodized aluminum, 1.26 in diameter	—
Internal components	ABS and nylon polyamide	—
Warranty	2 years (per official Amazon listing)	2 years
Sold as	Pair with cradles	—
Weight settings	—	8, 12, 20, 25, 35 and 40 lb
Handle diameter	—	28 mm
Shell	—	Plastic composite over metal plates
Model number	—	100790

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