The difference in quality and durability between cheap and expensive motorcycle parts can be substantial. Generally speaking, more expensive parts tend to be of higher quality and more durable than cheap parts.

Materials: More expensive parts are often made from higher-quality materials, such as aircraft-grade aluminum, titanium, and carbon fiber, which are stronger and more durable than cheaper materials like plastic and steel.

Design: More expensive parts are often designed with better engineering and manufacturing processes, resulting in improved performance, durability, and longevity.

Testing: More expensive parts are often subjected to more rigorous testing and quality control procedures, ensuring that they meet higher standards of performance and reliability.

Brand reputation: More expensive parts are often produced by established brands with a reputation for producing high-quality products, and these brands are more likely to stand behind their products with warranties and guarantees.

While it's possible to find some cheap motorcycle parts that are of high quality and durability, it's generally a good idea to invest in high-quality, reputable parts for critical components like brakes, suspension, and engine parts. Investing in quality parts can help to ensure the safety and reliability of your motorcycle, and can save you money in the long run by reducing the need for repairs and replacements.