Setehøyden på sykkelsetet er riktig.

It is a compound noun, which is very common in Norwegian.

• sete = seat
• høyde = height
• setehøyde = seat height
• setehøyden = the seat height

In Norwegian, compounds are usually written as one word, not two. The last part is the main part, so setehøyde is a type of høyde. That last part also controls the gender and the ending.

Because Norwegian usually puts definiteness on the end of the noun instead of using a separate word.

• setehøyde = seat height
• setehøyden = the seat height
• sykkelsete = bicycle seat
• sykkelsetet = the bicycle seat

So the endings themselves are doing the job that the does in English.

Here, på is the natural preposition for talking about the height of something like a seat.

Norwegian often says:

• høyden på setet
• literally: the height on the seat
• natural English: the height of the seat

So even though English would usually use of, Norwegian often uses på in this kind of phrase.

Yes, a little.

Since sykkelsete already includes the idea of seat, the full phrase can sound slightly heavy or technical. It is understandable, but many speakers would probably prefer:

• Høyden på sykkelsetet er riktig
• or simply Setehøyden er riktig if the context is already clear

So the given sentence is possible, but not the most elegant version in every situation.

Because riktig is used predicatively after er, and adjectives ending in -ig normally keep the same form in singular.

Compare:

• Setehøyden er riktig
• Svaret er riktig

But in the plural, you do get a different form:

• Innstillingene er riktige

So riktig is the expected form here.

In this context, riktig usually means something like:

• correct
• proper
• correctly adjusted

It does not usually mean right in the direction sense. It is about the setting or adjustment being appropriate.

It follows a very common pattern:

• Setehøyden på sykkelsetet = subject
• er = verb
• riktig = predicate adjective / subject complement

So the structure is basically:

subject + verb + description

This is the normal word order for a simple statement in Norwegian.

Yes, absolutely. In fact, høyden på sykkelsetet will often sound more natural.

Both are understandable, but:

• setehøyden på sykkelsetet = more technical or repetitive
• høyden på sykkelsetet = simpler and more natural in many contexts

So this is often a style choice rather than a strict grammar issue.