Analysis by Valery Grin · · updated October 3, 2026
Onlyfire F-GCG8521: stainless grill expander rack, 40 x 33.7 cm
A second cooking layer for the kamado: more wings and ribs per batch, with fit declared for the BGE Large
From€50
Reference price on Amazon (June 2026) · subject to change
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- Weight
- 1.56 kg
- Material
- Stainless steel (the listing does not give the alloy)
Quick answer
It depends on your kamado. It is a stainless expander that adds a second cooking layer, and the listing declares fit for the Big Green Egg Large, Kamado Joe Classic and other models. Worth it if you cook for a crowd and yours is on the list; the listing gives no shape or clearance, and has only 26 reviews (4.8).
A stainless steel grill expander, 40 x 33.7 x 9 cm and 1.56 kg, that adds a second cooking layer. It declares fit for the BGE Large, Kamado Joe Classic and other models; shape and clearance are not stated.
The Onlyfire F-GCG8521-RS1-A-EU is what the listing calls a grill expander: a stainless steel rack that adds a second cooking layer above the main grate. The declared dimensions are 40 x 33.7 x 9 cm and 1.56 kg. The maker talks of "premium-quality stainless steel construction" and resistance to rust, but does not say which alloy it is or what temperature it withstands, so that "premium quality" stays a slogan. We have not had it in our hands: this entry is a reading of the Amazon page, not a test.
The compatibility list is long and specific, which is the good part: Big Green Egg Large, Kamado Joe Classic, Pit Boss K22 and K24, Louisiana Grills K22 and K24, Char-Griller 16620, Large Grill Dome, Coyote Asado Cooker and Weber Kettle. The MiniMax, the Joe Jr, the XL and the Big Joe do not appear, so do not take fit for granted on those. There is also a geometric point to keep in mind: with a footprint of 40 x 33.7 cm, if the piece were a perfect rectangle its diagonal would run to about 52 cm (our estimate), more than the 46 cm grate of a Large. The listing does not publish the shape or how it sits, so the declared fit has to be taken on trust, but look at the photos before ordering.
The logical use is two heights. On a kamado that almost always means cooking [indirect](/glosario#indirect-cooking), with the deflector under the grate (the [guide to direct versus indirect](/guias/coccion-directa-vs-indirecta-kamado-deflector) explains it), and spreading the food over two levels. A second level brings the food closer to the dome, where indirect cooking usually runs hotter: on top, what tolerates or wants more heat; below, the delicate things. That is physics, not a fact from the listing. [Crispy wings](/recetas/alitas-pollo-crujientes-kamado) or cut-up ribs are the obvious case where surface area is the limit. And on a Big Green Egg Large the indirect part underneath comes from a deflector of that size (the loose [Onlyfire 44.5 cm cordierite deflector](/accesorios/onlyfire-piedra-deflectora-bge-large-44-5) or the deflectors of a system such as the [Onlyfire GCG-8552](/accesorios/onlyfire-gcg8552-sistema-coccion)); there is no single option.
Now the drawbacks, which are the ones that decide. The rating is 4.8 out of 5, but from only 26 reviews: an indication, not a guarantee. The listing does not publish the shape, does not say whether the rack folds or what load it takes, and does not clarify whether the 9 cm in the third dimension is the height (the likely reading). That figure matters: with food on top, the dome has to close, and the listing gives no clearance. "Easy to install" is all it says about fitting. It also does not say what temperature it withstands, so take care with very fierce direct fire.
In one sentence: a simple way to gain surface area if your kamado is on its list and you often cook for groups, with the shape, the support and the clearance still to be confirmed before you rely on it.
Useful if you cook for a crowd and your kamado is on its list. The deciding data is missing: shape, support and clearance. Rating from the listing, not hands-on.
Editorial rating from spec sheet, measurements and kamado fit · not a hands-on test
Pros
- Declared, specific compatibility: BGE Large, Kamado Joe Classic, Pit Boss K22/K24 and more
- Stainless steel, 1.56 kg declared: a light piece to put in and take out
- Adds a second cooking layer: more wings or cut-up ribs per batch
- The listing mentions an open-grid design, which does not block airflow the way a plate would
Cons
- Only 26 reviews (4.8 average): a small sample to trust the rating
- No shape, clearance or folding stated: check that the dome will close
- Not declared for the MiniMax, Joe Jr, XL or Big Joe
Who it's for
Owners of a Big Green Egg Large or Kamado Joe Classic who run out of grate with wings or cut-up ribs for groups.
Not for
If your kamado is a MiniMax, Joe Jr, XL or Big Joe (not listed), or you cook for two: a plain grate is enough. Without indirect cooking you will get little from it.
Specifications
- Weight
- 1.56 kg
- Material
- Stainless steel (the listing does not give the alloy)
As an Amazon Associate, mikamado.es earns from qualifying purchases. At no extra cost to you.
Goes well with
Onlyfire F-FPA5049-YE-EU: 44.5 cm round cordierite heat deflector
On a Big Green Egg Large this is the exact pairing: the 44.5 cm cordierite deflector (1.5 cm thick, 3.11 kg, 1000 °C declared) goes underneath for indirect cooking and the rack sits above as the second level. They are separate pieces, bought separately. The disc's listing does not say how it is supported, so check the clearance under the rack.
€37
ThermoPro TP17H: 4-probe wired thermometer, -10 to 300 °C
With food at two heights, temperature stops being the same across the whole chamber. A four-probe wired thermometer lets you watch one piece above, another below and the kamado ambient at once. By its title it reads -10 to 300 °C; check that the cable reaches your grate.
€36
Rapicca XL Barbecue Gloves 43 cm
The second layer sits higher and closer to the dome, so moving it and serving from it means putting your hands under the hot dome. Long gloves protect the wrist and forearm; these are 43 cm according to the title. They are the logical complement to a raised rack.
€40
FAQ
Will it fit my kamado?
The listing names the Big Green Egg Large, Kamado Joe Classic, Pit Boss K22/K24, Louisiana Grills K22/K24, Char-Griller 16620, Large Grill Dome, Coyote Asado Cooker and Weber Kettle. If yours is there, the maker declares the fit. If not, there is no basis to claim it: the MiniMax, Joe Jr, XL and Big Joe are not listed. The dimensions are 40 x 33.7 x 9 cm, but the shape and support are not published, so look at the photos and measure your grate and the height up to the dome.
Is it the same piece that comes with the Onlyfire GCG-8552 system in the catalogue?
There is no basis to say it is the same. This one has reference F-GCG8521-RS1-A-EU and the listing presents it on its own, as a grill expander. The catalogue's GCG-8552 is a set of two grates, a rack and two deflectors for a Large kamado, with a different reference and a different listing. If you already own the system and want a second level, check first whether its rack does the job for you; if not, this piece is a separate purchase.
What goes on each level?
That is cooking judgement, not a fact from the listing. In indirect, the upper layer sits closer to the dome and usually gets more heat: use it for small pieces that tolerate or want colour, such as wings. The lower layer, on the main grate, is for delicate food or whatever takes longer. Spread things out without piling them up so air can move, use two probes if a piece is thick, and swap the levels midway if you see differences in colour.
How do I clean and look after it?
The listing says the smooth stainless surface cleans without fuss and mentions resistance to rust, but it gives no care instructions and no alloy. The sensible approach is to clean it while the kamado is still warm, with a brush or non-abrasive sponge, and store it dry. Stainless does not mean invulnerable: in a coastal home, salt and damp can leave marks on any stainless steel, so dry it well.