Plášť je na ráfku.

to be

Breakdown of Plášť je na ráfku.

• na: on
• plášť: the bicycle tyre
• ráfek: the wheel rim

Questions & Answers about Plášť je na ráfku.

What does plášť mean here? I thought plášť meant coat or cloak.

Yes, plášť can mean coat, cloak, covering, or outer layer in different contexts. In bicycle or wheel vocabulary, plášť commonly means the tire (more precisely, the outer tire casing).

So in this sentence, plášť is not clothing. It is the tire mounted on the wheel.

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Why is it na ráfku and not na ráfek?

Because na here means on in the sense of location, and with that meaning it takes the locative case.

• dictionary form: ráfek = rim
• locative singular: ráfku
• so: na ráfku = on the rim

This is a very common pattern in Czech:

• na stole = on the table
• na kole = on the bicycle / on the wheel
• na ráfku = on the rim

If na expresses movement toward something, it can take the accusative instead, but here the sentence describes a state, not motion.

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What case is ráfku?