Ο τροχός του ποδηλάτου δεν γυρίζει καλά, γι’ αυτό πάω με το λεωφορείο.

Του ποδηλάτου means of the bicycle or more naturally the bicycle’s.

Greek often shows possession with the genitive case, so:

• ο τροχός = the wheel
• του ποδηλάτου = of the bicycle

So the whole phrase is literally:

• Ο τροχός του ποδηλάτου = The wheel of the bicycle

This is the normal Greek way to say the bicycle wheel.

Greek uses the definite article very often—more often than English.

In this sentence:

• ο τροχός = the wheel
• του ποδηλάτου = of the bicycle
• το λεωφορείο = the bus

Even where English might say by bus without an article, Greek usually says με το λεωφορείο = literally with the bus / by the bus.

So the articles here are completely normal Greek.

Γυρίζει is the 3rd person singular, present tense of γυρίζω.

Here it matches ο τροχός because ο τροχός is singular:

• ο τροχός γυρίζει = the wheel turns / is turning / spins

Greek present tense can often translate into English in more than one way depending on context:

• turns
• is turning
• spins
• is spinning

In this sentence, γυρίζει means the wheel is turning/spinning properly.

Δεν means not and is the standard way to negate a verb in modern Greek.

It normally goes right before the verb:

• γυρίζει = it turns
• δεν γυρίζει = it doesn’t turn

So:

• Ο τροχός του ποδηλάτου δεν γυρίζει καλά = The bicycle wheel doesn’t turn well

That placement is very typical in Greek.

Because καλά here is an adverb, not an adjective.

Compare:

• καλός / καλή / καλό = good (adjective, describing a noun)
• καλά = well (adverb, describing how something happens)

Here it describes how the wheel turns:

• γυρίζει καλά = turns well

So καλά is the correct form.

Γι’ αυτό means therefore, so, or that’s why.

It connects the first idea to the result:

• The wheel doesn’t turn well,
• γι’ αυτό = so / that’s why
• I go by bus.

It is a very common Greek connector for showing cause and result.

Γι’ αυτό is a shortened form of για αυτό.

The apostrophe shows that a vowel has been dropped in pronunciation/writing. This kind of shortening is common in Greek.

In this sentence, γι’ αυτό functions as a fixed expression meaning:

• therefore
• for that reason
• that’s why

So the apostrophe is just part of the contracted spelling.

Both πάω and πηγαίνω can mean I go.

• πάω is very common in everyday speech.
• πηγαίνω is also correct, and in some contexts may sound a bit more formal or neutral.

So:

• πάω με το λεωφορείο = I go by bus
• πηγαίνω με το λεωφορείο = also correct

Learners should get used to seeing both.

Yes, με often means with, but it is also used for means of transport.

So Greek says:

• πάω με το λεωφορείο = I go by bus
• literally: I go with the bus

This is just the normal Greek pattern.

You can compare:

• με το αυτοκίνητο = by car
• με το τρένο = by train
• με το ποδήλατο = by bicycle

After με, Greek uses the accusative case.

Here:

• το λεωφορείο is accusative singular

For neuter nouns like λεωφορείο, the nominative and accusative are often the same in form, so it looks unchanged.

That is why you see:

• με το λεωφορείο

If it were a masculine noun, you would often see a clearer case difference.

Yes. Greek word order is more flexible than English, although not completely free.

This sentence as written is very natural:

• Ο τροχός του ποδηλάτου δεν γυρίζει καλά, γι’ αυτό πάω με το λεωφορείο.

But you could also say:

• Γι’ αυτό πάω με το λεωφορείο, γιατί ο τροχός του ποδηλάτου δεν γυρίζει καλά.

The original version is straightforward and natural: first the problem, then the consequence.

No. Γυρίζω / γυρίζει is a very common verb with several meanings depending on context.

Some common uses are:

• turn / spin
  
  • Ο τροχός γυρίζει. = The wheel turns.
• turn around
  
  • Γυρίζει και με κοιτάζει. = He turns and looks at me.
• return / come back
  
  • Γυρίζω σπίτι. = I’m returning home.

In this sentence, because the subject is ο τροχός, the meaning is clearly turns / spins.

Not with exactly the same meaning.

• Ο τροχός του ποδηλάτου δεν γυρίζει καλά = The bicycle wheel doesn’t turn well
• Το ποδήλατο δεν γυρίζει καλά would sound more like The bicycle doesn’t steer/turn/move well, depending on context.

The original sentence focuses specifically on the wheel, not the whole bicycle. So ο τροχός is important here.

Yes. Greek present tense can describe:

• something happening now
• a general situation
• a habitual action

So in this sentence:

• δεν γυρίζει = doesn’t turn / isn’t turning
• πάω με το λεωφορείο = I go / I’m going by bus

The exact English translation depends on context, but the Greek present tense works naturally here for the situation being described.