coaster brake

Noun

A special rear hub for a bicycle that functions as a brake when the user pedals backwards, and which allows the bicycle to roll without forcing the pedals to turn.

Japanese Meaning

ペダルを後ろにこぐと作動する特殊な自転車の後輪ハブ。ペダルを常に回す必要なく走行できる機構を持つ。

What is this buttons?

My old bike has a coaster brake that makes it easy to stop by pedaling backward.

Google Translation / DeepL Translation

私の古い自転車には、ペダルを後ろに漕ぐと作動する後輪ハブ内蔵のブレーキが付いていて、止まりやすい。

Details

Sense（1）

A special rear hub for a bicycle that functions as a brake when the user pedals backwards, and which allows the bicycle to roll without forcing the pedals to turn.