What does ローラー mean?
ローラー is a Japanese noun meaning “roller” in English. It is written as ローラー in hiragana, and rooraa in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
フロントローラーのスラスト角は２度、多分レース時にはもう少し角度を強める予定です。
The front-roller thrust angle is 2 degrees, probably there were plans to strengthen that angle a little when racing.