derailleur

"He wore a gold chain around the neck."

"The student adjusted her chair so she could see the board better. "

"The cyclist wore a helmet for safety while riding on the busy street. "

"The new road is much smoother than the old one, making the drive more comfortable. "

"The product is undergoing a change in order to improve it."

"My son rode his bicycle to school this morning. "

"The mechanic fixed the broken bicycle chain. "

"The bicycle chain slipped off the sprocket, making it impossible to pedal. "

"Prices climbed steeply."

"The bicycle's gears are a complex mechanism that converts the rider's pedaling motion into forward movement. "

"The entire class was excited for the field trip. "

"There is one sterling and here is another"