"It's false. But, of course, only when comparing tubes with the same thickness and mechanical characteristics. A chassis made using 32 mm tubes has a higher flexural modulus, which makes the frame stiffer. If, however, materials with different mechanical characteristics are used, it is possible to produce a 30 mm chassis with the same stiffness as a 32 mm one, and vice versa. It is a useful characteristic if, for example, a manufacturer has an approved chassis built using 30 mm tubes, but needs to achieve the same performance as one using 32 mm ones".