Learn Hardcore Italian: Nel magazzino si trovano anche le ruote di scorta per i carrelli. - In the warehouse there are also spare wheels for the trolleys.

si trovano literally means “they are found” or “can be found.” Here si is the impersonal/passive si, not a reflexive pronoun. It turns the verb trovare into a passive-like construction, so the sentence tells us what exists or is located in the warehouse without specifying who does the “finding.”

Could we replace si trovano with ci sono? Is there any nuance?

Yes. Nel magazzino ci sono anche le ruote di scorta per i carrelli is perfectly correct.

Ci sono means “there are.”
Si trovano places a bit more emphasis on the idea of “being located,” but in everyday conversation the difference is minimal.

Why is it nel magazzino instead of al magazzino or just in magazzino?

in expresses “inside” and contracts with il to become nel.
al (a + il) simply means “at,” but in is preferred for enclosed spaces like warehouses.
You can drop the article and say in magazzino if you speak in general terms, but nel magazzino points to a specific warehouse already known in context.

Why is anche placed between the verb and the noun phrase?

Short adverbs like anche normally come immediately after the conjugated verb and before the element they modify. Placing anche between trovano and le ruote clearly marks that “also the spare wheels” are found there.

What does di scorta mean, and how does it function here?

di scorta literally means “of reserve” and functions as an adjective phrase modifying ruote. Together they form ruote di scorta = “spare wheels.” The preposition di links the noun to its description.

Why is it per i carrelli with the definite article i after per?

In Italian, when you refer to specific or previously mentioned items, you keep the definite article after a preposition. Here i carrelli are the known carts (e.g. the ones in that warehouse). Omitting i (per carrelli) would sound very generic and is less common in this context.

Can we reorder the sentence by putting le ruote di scorta per i carrelli at the front?

Yes. You can say:
Le ruote di scorta per i carrelli si trovano anche nel magazzino.
Italian allows flexibility—all elements can move for emphasis. The impersonal si stays with the verb, and you can shift subject and adverb around as needed.

How do you pronounce magazzino, scorta, and carrelli, and where is the stress?

• magazzino: ma-gat-TSI-no (stress on -TSI-)
• scorta: SCOR-ta (stress on SCOR-)
• carrelli: ca-REL-li (stress on REL; the double l is a clear /l/ sound, like in the English word “million”)