באופניים יד שנייה יש שריטה.

Literally, יד שנייה means second hand. It is the normal Hebrew expression for second-hand / used.

It is feminine singular because:

• יד = hand, and יד is a feminine noun
• שנייה = second in the feminine singular form, agreeing with יד

So the phrase stays יד שנייה no matter what noun it describes:

• אופניים יד שנייה = second-hand bicycle
• ספר יד שנייה = second-hand book
• רכב יד שנייה = second-hand vehicle

The phrase agrees with יד, not with אופניים.

Because in Hebrew, descriptive words and expressions usually come after the noun, not before it.

So English:

• second-hand bicycle

becomes Hebrew:

• אופניים יד שנייה

That is normal Hebrew word order. English puts many modifiers before the noun; Hebrew usually puts them after.

יש means there is / there are.

So:

• יש שריטה = there is a scratch

Hebrew uses יש for existence. This is different from simple adjective sentences like:

• הספר חדש = the book is new

But when you mean there is / there are, you use יש:

• יש שריטה
• יש בעיה
• יש אנשים

Also, יש does not change for gender or number:

• יש שריטה = there is a scratch
• יש שריטות = there are scratches

Yes, it could also be יש שריטה באופניים יד שנייה.

Both are possible, but the word order changes the feel a little:

• יש שריטה באופניים יד שנייה = more neutral, straightforward
• באופניים יד שנייה יש שריטה = starts with the topic/location, like as for the second-hand bicycle, there is a scratch on it

Hebrew word order is more flexible than English, especially when bringing a location or topic to the front.

Here ב־ means something like in / on / at, depending on context.

In this sentence, באופניים is understood as on the bicycle / in the bicycle in a broad sense: the scratch is located there.

Hebrew often uses ב־ in places where English prefers on:

• באוטובוס = on the bus / in the bus
• במכונית = in the car
• באופניים = on the bicycle

So even though English says on the bike, Hebrew can naturally use ב־.

You often can use על if you want to emphasize the surface more directly.

Compare:

• יש שריטה באופניים = there is a scratch on/in the bicycle
• יש שריטה על האופניים = there is a scratch on the bicycle

With damage to an object, Hebrew may use either, depending on style and emphasis. In your sentence, ב־ is perfectly natural.

Yes, אופניים is a plural-looking form, historically related to a dual form, because a bicycle has two wheels.

Even though it refers to one bicycle, the word itself is normally used in this plural form:

• אופניים

So Hebrew treats it as a plural-form noun. That is why you may also see plural agreement with adjectives:

• אופניים חדשים = a new bicycle / new bicycles

This is similar to some English nouns that look plural but can refer to one item, like pants or scissors.

Because שריטה is the thing that is being said to exist.

The sentence means:

• there is one scratch on the bicycle

So שריטה is singular because there is only one scratch.

If there were more than one, you would say:

• יש שריטות = there are scratches

The form of אופניים does not control the number of שריטה. They are not agreeing with each other here.

In unpointed Hebrew writing, those can look exactly the same.

באופניים can represent either:

• ב + אופניים = in/on a bicycle or in/on bicycles
• ב + ה + אופניים = in/on the bicycle

So the spelling alone does not always tell you. Context tells you which meaning is intended.

This is very common in Hebrew:

• בספר can mean in a book or in the book
• בבית can mean in a house or in the house

Because after יש, Hebrew usually introduces something indefinite:

• יש שריטה = there is a scratch

That is the normal pattern. A definite noun after יש is much less natural in standard Hebrew.

So:

• יש שריטה = there is a scratch
• not usually יש השריטה

If you want to talk about a specific scratch, Hebrew would usually rephrase:

• השריטה נמצאת על האופניים = the scratch is on the bicycle

Yes, you could, and it would sound like the second-hand bicycle has a scratch.

That uses the Hebrew possession pattern:

• ל־... יש ... = ... has ...

So:

• לאופניים יש שריטה = the bicycle has a scratch

The difference is mainly one of emphasis:

• באופניים... יש שריטה focuses more on the scratch being located on the bicycle
• לאופניים... יש שריטה focuses more on the bicycle as the possessor of the scratch

Both are understandable and natural.