taiyahaba ga hiroi.

subject particle

Breakdown of taiyahaba ga hiroi.

• 広ひろい: wide
• タイヤ幅はば: tire width

Questions & Answers about taiyahaba ga hiroi.

What exactly is タイヤ幅? Is it one word or two?

It is a compound noun made from:

• タイヤ = tire
• 幅 = width

So タイヤ幅 means tire width as a single technical-style noun. Japanese often combines nouns this way.

A less compact version is タイヤの幅, which means the same thing but is phrased more explicitly as the width of the tire.

Why is が used here?

が marks タイヤ幅 as the thing that has the property 広い.

The basic pattern is:

X が 広い = X is wide

So in this sentence, タイヤ幅 is what is being described as wide.

Could I say タイヤ幅は広い instead?

Yes, but the nuance changes.

• タイヤ幅が広い: neutral, straightforward identification of what is wide
• タイヤ幅は広い: makes タイヤ幅 the topic, and can sound more contrastive, like as for the tire width, it is wide

So が is often the more neutral choice when you are simply stating a property.

Why is 広い used with 幅?