One pair, or fifteen — and the difference is a mechanism · review
TREX SPORT Dumbbell and Barbell Set 20 kg review
A 20 kg pair that converts to a barbell with a supplied 40 cm connecting tube. Bar length, connector length and a per-bar load figure are all published, which is three more figures than most of this shelf gives.
The bottom line Bought for the connector rather than for the mass. Two 44 cm bars and a published 40 cm tube make a genuine two-in-one at a price where most sets publish no lengths at all, and the 50 kg per-bar figure is a declaration worth having even though the four supplied plates come nowhere near it. The thin plate list is the real limit here, not the steel.
What the maker publishes
Two dumbbell bars of 44 cm with a steel core and a plastic outer, four
plates in three denominations — 1 kg, 1.5 kg and 2.5 kg — four thickened star
collars described as having a double locking arrangement, and a foam-covered
connecting tube of 40 cm that turns the pair into a short barbell.
The maker also states a maximum load capacity of 50 kg per bar, and states
that the plates are filled with a cement and hardened sand mixture.
Two figures that do not meet
The 50 kg per bar is a statement about what the bar is designed to carry. The
set contains 20 kg in total.
Those are not in conflict — one is a capacity and the other is what is in the
box — but a listing that prints both invites them to be read as one number.
This page keeps them apart, which is the same treatment every load figure on
this site gets.
What the connector actually buys
A 40 cm tube joined to two 44 cm bars is a short barbell, not a full one. It
is long enough for pressing and rowing and it is not a bar that will sit in a
squat rack — the total length is well under what a rack’s uprights are spaced
for.
Sold as a space-saving arrangement, it is exactly that, and the fact that the
tube is supplied rather than sold separately is worth noting on a shelf where
accessories are routinely the second purchase.
The limit
Four plates. Whatever the bars will carry, the combinations available are the
ones those four denominations allow, and without a published bore there is no
way to confirm from the listing what else would fit.
Availability
About 36 € on the German Amazon store, on the one reading this page rests on.
The American, British, Italian and Spanish Amazon catalogues list the reference with nobody selling behind it.
The French Amazon store returned nothing at all, so the buy button there opens a search rather than an empty page.
These figures are what Keepa returned on the day this page was last written. Stock and prices move without notice.
Prices quoted in this text were read on 20 September 2026. The live price is at the top of the page.
The figures declared, and the gaps beside them
Strengths
Bar length, connector length and a per-bar load figure of 50 kg are all published
The connecting tube is supplied rather than sold as an accessory
Steel core inside the bars, stated by the maker rather than implied
Compromises
Only four plates, so the combinations available are few
The 50 kg per bar cannot be reached with the plates supplied
No bore published, so the set cannot be extended from the listing
Specifications
Weight range
20 kg for the set, as the maker states it
Step size
1 kg — the smallest plate supplied
Locking mechanism
Four thickened star collars with a double locking arrangement, as described
Bore
Not published by the maker
Handle diameter
Not published by the maker
Knurl
Non-slip moulded grip, described rather than measured
Overall length
44 cm per bar; 40 cm connecting tube
Set contents
2 bars of 44 cm, 4 plates (1 / 1.5 / 2.5 kg), 4 star collars, 1 foam-covered connector of 40 cm
Amazon reference
B0CXF68B6N (one reference across 5 Amazon marketplaces)
EAN
5902308231047
What buyers ask about this one
What does the 50 kg figure refer to?
The maker states a maximum load capacity of 50 kg per bar. It is a declaration about the bar rather than a total that the supplied plates can reach — the set contains four plates and 20 kg in all.
How long is the connecting tube?
The maker publishes 40 cm, foam-covered. Joined to the two 44 cm bars it makes a short barbell, and that combined length is worth checking against a rack before assuming it will sit in one.
What are the plates made of?
A plastic shell with a cement and hardened sand filling, which the maker states directly. That is the construction that protects a floor and that takes more bar length per kilogram than iron.
Who this one is for
A first purchase where one set has to be both dumbbells and a short barbell
Price and availability
A reference exists on these Amazon stores: Germany, Italy, Spain, United Kingdom, United States. Listed is not the same as in stock — availability changes daily.
Details checked on September 20, 2026.
Sources
Specifications: the manufacturer sheet for home gym equipment and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
A two-in-one set sold across a 15 to 40 kg range, with a published 400 mm connecting tube and a stated 15 mm of foam padding on it. The contents list is complete; the plate breakdown is not.
Best for: Somebody buying the two-in-one arrangement rather than a specific plate list
A 40 kg spinlock pair sold on floor protection as much as on load: cement-filled plastic plates, cross-knurled handles and four star collars. The plates are the reason it is cheap and the reason a bar fills up early.
Best for: A first pair where the floor matters and the total never needs to be high
A 30 kg spinlock pair whose useful figure is its plate list: sixteen plates in four denominations, on two published 47 cm bars. The 1.25 kg smallest step is finer than most sets at this price.
Best for: Someone who wants small increments rather than a high ceiling