When it comes to determining the right road bike seat size, there seems to be some variation in the methods used by different manufacturers, with some focusing on inseam length, others on saddle height, and a few using a combination of both. What is the most accurate method for measuring oneself to ensure the correct road bike seat size, and are there any specific considerations that should be taken into account for those with shorter or longer torsos? Should one prioritize the manufacturers size chart or seek a professional bike fitting, and what are the potential consequences of riding a bike with a seat size that is slightly off?