Lotta's Bike by Astrid Lindgren. Visst kan Lotta cykle. 1971. Ilon Wikland
From basic repairs like how to fix a flat tyre to advanced overhauls of drivetrains and brakes, Lennard Zinn's clearly illustrated guide makes every bicycle repair and maintenance job easy for everyone.
Well that escalated quickly.
My children's picture book from Roaring Brook Press/Neal Porter Books/Macmillan available for pre-order! (Ships in May though, for which I apologize...)