Will a 12.5 bicycle tube work on 12 inch tire?

It is generally not recommended to install a bicycle tube of a different size than what is specified for the tire. Although the difference between 12 and 12.5 inches may seem small, using a 12.5-inch tube in a 12-inch tire could stretch the tube beyond its intended size, making it prone to punctures and compromising its ability to hold air effectively.

For safety and reliability, it is better to use a 12-inch tube specifically designed for 12-inch tires to ensure a proper fit and optimal performance.