A person who repairs bicycles is commonly referred to as a "bike mechanic" or a "bicycle mechanic." These professionals are trained to diagnose and fix various issues with bicycles, including repairing brakes, gears, chains, and wheels. Bike mechanics often work in bike shops or repair centers, utilizing specialized tools and knowledge of bicycle components to ensure bikes are in proper working condition.
A bicycle where one person is sitting ahead of the other is called a tandem.
A locksmith
cobbler
mechanic
glazier
A person who repairs chimneys is called a chimney sweep. They are responsible for cleaning and maintaining chimneys to ensure they function safely and efficiently. In addition to cleaning, they may also inspect and repair chimney structures.
A person who installs repairs replaces and dismantles the machinery and heavy equipment used in almost very industry is called a machinist.
The name of someone who repairs machinery is a machanic.
Watchmaker Also, an heurologist
A bicycle seat is typically called a saddle.
The earliest bicycles were also called hobby horses or boneshakers.
The noun 'bicycle' is a common noun, a general word for any bicycle. A proper noun is the name of a specific person, place, or thing. A proper noun for the common noun 'bicycle' is the name of a bicycle, such as the Norco Bigfoot and the Schwinn Voyager, or Bradley's Bicycle Shop.