syataizyuuryou ga karui.

It is read:

しゃたいじゅうりょう が かるい

• 車体重量 = しゃたいじゅうりょう
• が = が
• 軽い = かるい

So the whole sentence is しゃたいじゅうりょう が かるい.

車体重量 is a compound noun made of:

• 車体 = vehicle body / car body
• 重量 = weight

Together, 車体重量 means vehicle body weight or the weight of the vehicle body.

In technical or product-description contexts, Japanese often combines nouns like this into one compact term.

Here, が marks 車体重量 as the subject of the predicate 軽い.

So the structure is basically:

• 車体重量 = subject
• が = subject marker
• 軽い = is light

This is a very common pattern in Japanese:

• X が 軽い = X is light
• X が 高い = X is expensive / high
• X が 大きい = X is big

Since 軽い is describing 車体重量, が is natural here.

In Japanese, an い-adjective like 軽い can act as the main predicate of a sentence all by itself.

So you do not need a separate verb meaning is in the plain form.

• 車体重量が軽い。 = The vehicle body weight is light.

This is different from English, where you need is. In Japanese, 軽い already functions as the predicate.

Because 軽い is an い-adjective, and い-adjectives keep their own form when used as predicates.

So:

• plain: 軽い
• polite: 軽いです

You do not say 軽です, because that would treat it like a な-adjective or noun, and 軽い is neither of those.

Both can be possible, but the nuance changes.

• 車体重量が軽い。

  • focuses on the fact that the body weight is light
  • often feels like describing a feature or highlighting that point

• 車体重量は軽い。

  • sets 車体重量 as the topic
  • can sound more contrastive, like As for the body weight, it’s light

In short:

• が = more neutral for presenting the property
• は = more topical or contrastive

In a spec sheet, ad copy, or feature description, が is very natural when highlighting a positive characteristic.

Yes. It is a complete sentence in the plain style.

• plain: 車体重量が軽い。
• polite: 車体重量が軽いです。

Japanese often omits です in plain statements, especially in:

• written descriptions
• notes
• technical writing
• casual speech
• headlines or bullet points

So this sentence is fully valid as written.

Both are possible, but they feel slightly different.

• 車体重量

  • compact, technical, label-like
  • common in specifications and formal descriptions

• 車体の重量

  • more explanatory and less compact
  • literally the weight of the vehicle body

Japanese often prefers long compound nouns in technical contexts, so 車体重量 sounds natural in that kind of setting.

It is natural, but it sounds somewhat technical or descriptive, not very conversational.

You might see it in:

• product specifications
• marketing materials
• engineering discussions
• comparison charts

In everyday conversation, someone might say something more like:

• この車は軽い。 = This car is light.
• 車体が軽い。 = The body is light.
• 重量が軽い。 = The weight is low/light.

So 車体重量が軽い is natural, but it has a more technical feel.

Japanese commonly uses 軽い with things related to weight, even where English might prefer low.

So Japanese thinks in terms of:

• 重い / 軽い = heavy / light

That applies both to physical objects and to stated weight values.

So 車体重量が軽い is normal Japanese, even if the most natural English translation might be something like:

• The vehicle body weight is low
• The car has a light body weight
• The vehicle is lightweight

Japanese and English do not always choose the same adjective.

It specifically points to 車体重量, so the sentence is about the weight value/property of the vehicle body, not just a broad statement about the whole car.

If you wanted to say simply the car is light, you would more naturally say:

• 車が軽い。

If you want to focus on the body specifically:

• 車体が軽い。

So 車体重量が軽い is more precise and technical than 車が軽い.

Yes. 軽い can describe:

• a physical object: 荷物が軽い = The luggage is light.
• a body part or structure: 車体が軽い = The vehicle body is light.
• a weight measurement or weight property: 重量が軽い = The weight is light / low.

So even though 重量 is itself a noun meaning weight, it can still be the thing described as light in Japanese.

The pattern is:

Noun + が + い-adjective

In this sentence:

• 車体重量 = noun
• が = subject marker
• 軽い = い-adjective

So the full pattern is:

車体重量が軽い = The vehicle body weight is light

This is one of the most basic and useful Japanese sentence patterns.