Creator verdict: RecommendsBowFlex SelectTech 840 Adjustable Kettlebell
Head-to-head · Dumbbells & Kettlebells
BowFlex SelectTech 840 Adjustable Kettlebell vs BowFlex SelectTech 552 Adjustable Dumbbells (Results Series)
Which should you buy in 2026? FR Scores, specs, prices and 6 independent video reviews, side by side.
FR Score 8.3 out of 10, Great
Six kettlebells in one: dial from 8 to 40 lb in seconds.
Typical price · Single adjustable kettlebell (8–40 lb) at BowFlex.com
FR Score 8.1 out of 10, Great
The best-known dial dumbbell, redesigned with metal parts after its 2025 recall.
Typical price · Results Series pair, list price at BowFlex.com; often discounted
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The quick verdict
BowFlex SelectTech 840 Adjustable Kettlebell edges ahead with an FR Score of 8.3 vs 8.1, winning on build quality & durability, ease of use & footprint and value for money. It’s our Best Kettlebell, while SelectTech 552 Adjustable Dumbbells (Results Series) is our Best for Beginners. SelectTech 840 Adjustable Kettlebell is the cheaper pick by about $330.
Choose SelectTech 840 Adjustable Kettlebell if…
- One dial covers six weights from 8 to 40 lb
- Fastest weight changes of any kettlebell style
- Reasonably priced at about $149
Choose SelectTech 552 Adjustable Dumbbells (Results Series) if…
- Dial adjustment is the easiest system for beginners to learn
- 5–52.5 lb range replaces 15 sets of weights
- Redesigned with metal plate-attachment parts and a locking mechanism
Scores
Score breakdown
Each criterion scored 0–10 by our methodology. The winner of each row is highlighted.
CriterionSelectTech 840 Adjustable KettlebellSelectTech 552 Adjustable Dumbbells (Results Series)
FR Score (overall)
Build Quality & Durability
Performance & Feel
Ease of Use & Footprint
Value for Money
Typical price
Video reviews
Specs
Specs side by side
| Spec | SelectTech 840 Adjustable Kettlebell | SelectTech 552 Adjustable Dumbbells (Results Series) |
|---|---|---|
| Weight range | 8–40 lb | 5–52.5 lb per dumbbell |
| Weight settings | 8, 12, 20, 25, 35 and 40 lb | — |
| Replaces | 6 kettlebells | 15 sets of weights |
| Adjustment | Dial selector with storage base | Dual weight-selection dials |
| Handle diameter | 28 mm | — |
| Shell | Plastic composite over metal plates | — |
| Warranty | 2 years | — |
| Model number | 100790 | BFW0025-OS |
| Plate attachment | — | Metal components with secure locking mechanism |
| Grip | — | Non-slip ergonomic handle |
| Included | — | Storage trays |
| Stand | — | Compatible with BowFlex SelectTech Adjustable Dumbbell Stand (sold separately) |
| Sold as | — | Pair |
SelectTech 840 Adjustable Kettlebell: pros & cons
- One dial covers six weights from 8 to 40 lb
- Fastest weight changes of any kettlebell style
- Reasonably priced at about $149
- Compact footprint for apartments and small gyms
- Plastic shell isn't meant to be dropped
- Taller, more oval shape than a traditional kettlebell
- 28 mm handle is thinner than standard bells
- 40-lb maximum is light for stronger lifters
SelectTech 552 Adjustable Dumbbells (Results Series): pros & cons
- Dial adjustment is the easiest system for beginners to learn
- 5–52.5 lb range replaces 15 sets of weights
- Redesigned with metal plate-attachment parts and a locking mechanism
- Widely available and often discounted to around $399
- Original design was recalled in 2025; the redesign has a short track record
- Maxes out at 52.5 lb per hand
- Stays long and bulky even at light weights
- Not designed to be dropped
On video
What reviewers say
Creator verdict: RecommendsBowFlex SelectTech 840 Adjustable Kettlebell
Creator verdict: RecommendsBowFlex SelectTech 552 Adjustable Dumbbells (Results Series)
Creator verdict: RecommendsBowFlex SelectTech 552 Adjustable Dumbbells (Results Series)
SelectTech 840 Adjustable Kettlebell vs SelectTech 552 Adjustable Dumbbells (Results Series): FAQ
Is BowFlex SelectTech 840 Adjustable Kettlebell better than BowFlex SelectTech 552 Adjustable Dumbbells (Results Series)?
BowFlex SelectTech 840 Adjustable Kettlebell scores higher overall (8.3 vs 8.1 out of 10), winning on build quality & durability, ease of use & footprint and value for money. SelectTech 552 Adjustable Dumbbells (Results Series) still has the edge on performance & feel.
Which is cheaper, SelectTech 840 Adjustable Kettlebell or SelectTech 552 Adjustable Dumbbells (Results Series)?
At typical prices, BowFlex SelectTech 840 Adjustable Kettlebell costs about $330 less ($149 vs $479). Sizes and deals vary, so check the current price at the retailer.
Which has more video reviews?
We’ve cataloged 3 independent video reviews of SelectTech 840 Adjustable Kettlebell and 3 of SelectTech 552 Adjustable Dumbbells (Results Series). Both products’ pages list every review with the creator’s verdict.