Om du låser cykeln med ett hänglås vid cykelstället, är den säkrare där över natten.

Because Swedish main clauses follow the V2 rule: the finite verb must come in the second position.

Here, the sentence begins with the subordinate clause:

Om du låser cykeln med ett hänglås vid cykelstället

After that, the main clause starts, and the finite verb of the main clause must come first within that clause:

är den säkrare där över natten

So Swedish does not keep the English-like order den är after an initial if-clause.
This inversion is very common:

• Om du kommer i morgon, kan vi prata.
• När jag är hemma, lagar jag mat.

So är den is the normal and correct order here.

Because den refers back to cykeln, and cykel is a common gender noun in Swedish (an en-word):

• en cykel
• cykeln

Common gender nouns are referred to with den.
Neuter nouns (words that take ett) are referred to with det.

For example:

• en cykel → den
• ett hänglås → det

So in this sentence, den means the bicycle.

This is about indefinite vs definite form and also noun gender.

• ett hänglås = a padlock
• cykeln = the bicycle
• cykelstället = the bike rack / bicycle stand

1. Ett hänglås

This is indefinite because it means a padlock, not a specific one already known.

Also, hänglås is a neuter noun:

• ett hänglås
• hänglåset

2. Cykeln

This is definite because it refers to the bicycle already being talked about.

• en cykel
• cykeln

3. Cykelstället

This is definite too: the bike rack / the bicycle stand, meaning the relevant bike rack in that place or situation.

• ett cykelställ
• cykelstället

So the forms are chosen for both meaning and gender.

Here med means with, in the sense of using something.

So:

låser cykeln med ett hänglås
= lock the bicycle with a padlock

It tells you what tool or means is used to lock the bike.

Compare:

• Jag skriver med en penna. = I write with a pen.
• Han öppnade dörren med en nyckel. = He opened the door with a key.

So med is very natural here.

Vid usually means by, beside, at, or next to, depending on context.

In this sentence:

vid cykelstället
means something like
by the bike rack / at the bike rack

It suggests location near or attached to that place.

This is different from some other prepositions:

• i = in
• på = on / at
• vid = by / next to / at

For example:

• Jag sitter vid bordet. = I am sitting by the table.
• Hon står vid dörren. = She is standing by the door.

So here, vid cykelstället tells you where the bike is being locked.

Cykelstället is the definite form of cykelställ, which means a bike rack, bicycle stand, or sometimes cycle stand.

Forms:

• ett cykelställ = a bike rack
• cykelstället = the bike rack

The ending -et shows that it is:

1. neuter (ett word), and
2. definite (the)

So vid cykelstället means by the bike rack.

Yes. Säkrare is the comparative form of säker:

• säker = safe / secure
• säkrare = safer / more secure
• säkrast = safest / most secure

So:

är den säkrare
= it is safer / it will be safer

Swedish often forms comparatives with -are, especially for shorter adjectives.

Examples:

• snabb → snabbare
• billig → billigare
• säker → säkrare

So this part simply says the bike is safer in that situation.

Swedish, like English, can leave the comparison implicit when it is obvious from context.

Here, säkrare means something like:

• safer than if it were not locked
• safer than somewhere else
• safer than leaving it unsecured

English does this too:

• It’s safer there at night.
• This is better.

You do not always need to say exactly what it is being compared with. The sentence assumes the listener can understand the comparison from the situation.

Där means there and refers back to the location just mentioned: vid cykelstället.

So:

är den säkrare där över natten
= it is safer there overnight

It emphasizes the place: there, at that bike rack.

Could it be omitted? Yes, often it could:

Om du låser cykeln med ett hänglås vid cykelstället, är den säkrare över natten.

That still sounds natural.
Including där makes the location a little more explicit.

Över natten means overnight or during the night.

It is a fixed expression:

• stanna över natten = stay overnight
• lämna bilen över natten = leave the car overnight

So in this sentence it means the bike is safer if left there through the night.

Because om means if, while när means when.

• Om is used for a condition: maybe it happens, maybe it does not.
• När is used when something is expected or treated as a real event.

So:

• Om du låser cykeln... = If you lock the bike...
• När du låser cykeln... = When you lock the bike...

In this sentence, the idea is conditional: if you lock it that way, then it will be safer.

The comma after the initial om-clause is common and helpful, but Swedish comma usage is often a bit less strict than English learners expect.

So this is natural:

Om du låser cykeln med ett hänglås vid cykelstället, är den säkrare där över natten.

You may also see similar sentences without a comma, especially in less formal writing.

The important grammar point is not the comma, but the word order after the subordinate clause: är den, not den är.

Yes, that is grammatically possible.

Compare:

• Om du låser cykeln med ett hänglås vid cykelstället, är den säkrare där över natten.
• Den är säkrare där över natten om du låser cykeln med ett hänglås vid cykelstället.

Both are correct. The difference is mainly focus:

• Starting with Om du... puts the condition first.
• Starting with Den är... puts the result first.

The original version sounds very natural when giving advice or explaining how to make the bike safer.

Yes, that is the natural interpretation.

Literally, the sentence says you lock the bike with a padlock by/at the bike rack, but in real usage the listener will usually understand that the bike is being secured to the rack.

Swedish often relies on context here instead of spelling out every detail.

If you wanted to be more explicit, you could say something like:

låser fast cykeln vid cykelstället med ett hänglås

But the original sentence is perfectly understandable as it stands.

This is very common in Swedish. The present tense can express a general truth, advice, or future result.

So:

Om du låser cykeln ..., är den säkrare ...

can mean:

• If you lock the bike ..., it is safer ...
• If you lock the bike ..., it will be safer ...

Swedish often uses the present tense where English might use will.

This is especially common in conditional or instructional sentences. The meaning is clear from context, so Swedish does not need a special future form here.