Jitensha no Onee-san

The manga centers on 16-year-old Taiya, who lives in a share house with a 26-year-old caretaker named Ren, who loves bicycles in her private time. Taiya sees Ren as a goddess who is an expert in cleaning, laundry, and cooking, but also enjoys the sight of Ren fawning over his bicycle.
(Source: Anime News Network)