Context: They are travelling by bike.
The rider and pillion are on the bike.
Is "on" correct?
Let's assume there are two people on a bike. The rider refers to the person in front, who is pedalling, holding the handlebars, etc. the pillion refers to a seat behind the rider's seat.
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Let's assume there are two people on a bike.
The rider refers to the person in front, who is pedalling, holding the handlebars, etc.
the pillion refers to a seat behind the rider's seat. A person who sits on the pillion is a pillion passenger. You could shorten this to a passenger.
on is fine.
Clive