Yes, in some cases, the parts are surely interchangeable. Most specifically and commonly related parts include tubes and tires where you can interchange the tubes. This is common because the tube is the most common to wear out with time and lose air. Besides, they take the most direct impact and can get damaged or punctured. In such cases, you can replace them easily. Other interchangeable items on a bike include rims, seats, grips, and add-on accessories. The seat is the easiest part to change on a bike. However, not all the parts are interchangeable.