/10
BUY IT
Buy It
$149.00 · 4.8/5 stars · 7,651 Amazon reviews · #1 Best Seller in Kettlebells
The Bowflex SelectTech 840 solves the one real problem with kettlebell training at home: you eventually need six or seven different weights, and they eat your closet. This single kettlebell swaps between 8 and 40 lbs with a twist of the dial, replacing a full rack for less than the price of two mid-weight fixed kettlebells.
The Verdict
Our verdict is built from Amazon’s own verified-purchase review data (7,651 ratings averaging 4.8/5, making it the #1 best seller in its category), aggregated owner sentiment from home-gym forums, and published hands-on coverage from fitness gear reviewers. This is not a physical hands-on test by our team — it’s a data-driven verdict, and we say so plainly.
What We Liked
- Dial adjusts from 8 to 40 lbs in seconds, replacing 6 separate kettlebells (8, 12, 20, 25, 35, 40 lbs)
- Space-saving — one kettlebell footprint instead of a full rack
- 4.8/5 average across 7,651 verified Amazon reviews, the highest volume in its category
- Handles swings, goblet squats, rows, and twists without needing to swap equipment mid-set
What Could Be Better
- The dial mechanism and shifting weight plates feel less “natural” in the hand than a solid cast-iron kettlebell
- The 2-month JRNY app trial converts to a paid subscription automatically if not cancelled
- Bulkier profile than a fixed kettlebell of the same working weight
Kettlebell vs. Adjustable Dumbbells
If you’re deciding between an adjustable kettlebell and adjustable dumbbells for a home gym, here’s how the Bowflex 840 stacks up against the PowerBlock Elite EXP — the top-rated adjustable dumbbell pair in the same price tier:
| Product | Bowflex SelectTech 840 Kettlebell | PowerBlock Elite EXP Dumbbells |
|---|---|---|
| Our Score | 9.6/10 | 9.4/10 |
| Price | $149.00 | $399.99 |
| Weight Range | 8–40 lbs (1 kettlebell) | 5–50 lbs (pair) |
| Amazon Rating | 4.8/5 (7,651 reviews) | 4.7/5 (2,788 reviews) |
| Best For | Swings, squats, functional movement | Presses, curls, isolation lifts |
| Check Price → | Check Price → |
Best Overall Pick — Strength & Home Gym
The SelectTech 840 wins for anyone prioritizing functional, full-body movement in a small footprint. If your training is bench-and-curl focused, the PowerBlock pair is the better fit — see our comparison above.
As an Amazon Associate, NVERA earns from qualifying purchases. This verdict is based on our analysis of verified Amazon review data, aggregated owner sentiment, and published third-party coverage — not a physical hands-on test by our team.