Xe đạp này còn mới.

• xe đạp = bicycle / bike
• này = this
• còn = still
• mới = new

So the sentence literally follows the pattern:

bicycle + this + still + new

A very natural English rendering is This bicycle is still new or This bike is still in good, new condition.

In Vietnamese, demonstratives such as này often come after the noun.

So:

• xe đạp này = this bicycle
• người này = this person
• nhà này = this house

This is one of the most noticeable word-order differences from English. English says this bike, but Vietnamese says bike this.

Vietnamese often does not use a copula like English is/am/are before adjectives.

In English, you must say:

• This bicycle is new

In Vietnamese, you can simply say:

• Xe đạp này mới

And with còn:

• Xe đạp này còn mới

So the idea of is is understood from the sentence structure; it usually does not need to be spoken.

Còn adds the idea of still or remaining.

So:

• Xe đạp này mới = This bicycle is new.
• Xe đạp này còn mới = This bicycle is still new.

With còn, the speaker suggests that the bike has been used or has existed for some time, but it remains in new-looking or new-like condition.

It often carries the sense of:

• not old yet
• still in good shape
• still fairly new

Yes. Xe đạp này mới is grammatical and natural.

But the nuance is a little different:

• Xe đạp này mới = This bicycle is new.
• Xe đạp này còn mới = This bicycle is still new / still pretty new.

So còn gives extra emphasis to the condition continuing up to now.

Yes. In this sentence, mới is an adjective meaning new.

Vietnamese words can often have different functions in different contexts, but here mới describes the bicycle’s condition.

So in:

• Xe đạp này còn mới

mới tells us what the bicycle is like: it is new.

Not necessarily.

Còn mới usually focuses on the bicycle’s current condition, not strictly on when it was bought.

So it can mean:

• it still looks new
• it is not very worn
• it remains in good condition

A bike could be a bit old in age but still be described as còn mới if it has been kept very well.

Not necessarily. Xe đạp này còn mới is already perfectly natural.

But you may also hear:

• Chiếc xe đạp này còn mới
• Cái xe đạp này còn mới

About these:

• chiếc is a common classifier for vehicles and individual objects
• cái is a very common general classifier in everyday speech

Adding a classifier can make the noun phrase feel a little more complete or conversational, but leaving it out is very normal too.

The tones are:

• xe — level tone
• đạp — nặng tone
• này — huyền tone
• còn — huyền tone
• mới — sắc tone

A rough tone guide:

• này and còn have a lower, falling sound
• mới rises
• đạp has a short, heavy, clipped tone

Also note:

• đ in đạp is pronounced like English d
• plain d in Vietnamese is pronounced differently, depending on dialect

Usually condition.

When Vietnamese speakers say something còn mới, they often mean it still seems new in appearance, quality, or usefulness.

So for a bicycle, the sentence usually suggests:

• it is not very worn
• it is still in good shape
• it still looks fairly new

It is less about exact age and more about how new it seems now.

Sometimes yes, but the nuance is slightly different.

• còn mới = still new / remains new
• vẫn mới = still new, with stronger emphasis on continuity

For many everyday situations, both can work. But còn mới is especially common when talking about the condition of things such as clothes, phones, furniture, or bicycles.

You may also hear:

• Xe đạp này vẫn còn mới.

This is also natural and adds even more emphasis to the idea of still.

Yes, very natural.

A Vietnamese speaker could say this when:

• looking at a bike someone owns
• commenting that the bike is in good condition
• comparing it with older or more worn bicycles

It sounds like normal spoken or written Vietnamese and is a good pattern to remember for describing things that are still in good condition.