dendouashisutojitensha dakara, nedan ga takai wake da.

It is an electric-assist bicycle, so that explains the high price.

Breakdown of dendouashisutojitensha dakara, nedan ga takai wake da.

• が: subject particle
• 高たかい: high
• 値段ねだん: price
• だから: therefore

Questions & Answers about dendouashisutojitensha dakara, nedan ga takai wake da.

What does だから mean here?

Here, だから means because it is / that’s why and introduces the reason for the conclusion.

In this sentence:

• 電動アシスト自転車だから = because it’s an electric-assist bicycle

So the speaker is saying that the fact it is an electric-assist bike explains the high price.

A key nuance: だから often sounds a little like the speaker is connecting the dots for the listener:

• It’s an electric-assist bicycle, so of course the price is high.

It can sound slightly conversational and explanatory.

How should I understand わけだ in this sentence?

わけだ is very important here. It does not just mean reason in a dictionary sense. In this pattern, it means something like:

• that’s why
• it makes sense that
• no wonder
• so that explains it

So:

• 値段が高いわけだ = that explains why the price is high
• or no wonder it’s expensive

This pattern is often used when the speaker reaches a natural conclusion from some information.

So the sentence feels more like:

• It’s an electric-assist bicycle, so that explains why it’s expensive.

not just the flat statement:

• It’s expensive.