Rep Fitness Adjustable Kettlebell 20-40 lb
- Item Weight: 40 pounds
- Handle Diameter: 1.3 inches
- Material: Iron
- Unit Count: 1
Last refreshed Jun 30, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
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ASIN: B07KCKBHYXModel: KB-4100Category: Kettlebells
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Overview
An adjustable kettlebell that swaps among five weight settings from 20 to 40 lb (9 to 18 kg) with a push-and-twist mechanism, replacing a rack of fixed bells with one unit.
The most common gripe is a slight clacking sound from the internal plates during swings, though nobody reported it affecting durability.
- 5 weight settings, 20-40 lb (9-18 kg)
- Push-and-twist adjustment
- Matte powder-coated grip
- Rubber protective base
Who it's for
Home gym owners or travelers who want one kettlebell covering a weight range instead of five separate bells taking up floor space. Less useful if you only ever train at one fixed weight.
Pros and cons
- Five weight settings replace a rack of bells
- Handle shape and grip feel close to a fixed kettlebell
- Rubber base is gentle on gym flooring
- Internal plates cause a slight clacking noise on swings
- Printed instructions are reportedly unhelpful
Performance notes
Pushing down and twisting the handle selects among five internal steel plates, each held by its own fasteners inside a nylon thermoplastic retainer. A matte powder coat grip and rubber base are meant to hold up better than glossy competitors and protect flooring.
Specifications
| Brand | Rep |
|---|---|
| Model | KB-4100 |
| Dimensions & fit | |
| Item Weight | 40 poundshigher than 80% of 36 kettlebells |
| Handle Diameter | 1.3 incheslower than 67% of 34 kettlebells |
| Construction & materials | |
| Material | Iron |
| Included components | |
| Unit Count | 1 |
| Other details | |
| Part Number | KB-4100-40 |
| Recommended Uses For Product | Cross Fit, HIIT, Weight Lifting |
Closest rivals on specs
BowFlex SelectTech 840 Adjustable Kettlebell- Handle Diameter 1.3 vs 1.1 inches (+18%)
Yes4All Cast Iron Kettlebell Set 5-30 lb- Handle Diameter 1.3 vs 1.5 inches (-13%)
- Item Weight 40 vs 35 pounds (+14%)
Amazon Basics Cast Iron Kettlebell- Handle Diameter 1.3 vs 1.5 inches (-13%)
- Item Weight 40 vs 35 pounds (+14%)
Frequently asked questions
How many weight settings does this kettlebell have?
Five, changed by pushing down and twisting the handle.
What weight range does the KB-4100-40 cover?
20 to 40 lb (9 to 18 kg) per the listing.