What is the ideal size and fit for a Scott Plasma 10, and how much does personal preference play a role in determining this, versus traditional bike fit guidelines? Is a bike fit based on a traditional formula such as the Lemond method or the Trek fit system still relevant, or are these methods too rigid and not adaptable to the nuances of triathlon and time trial riding? Should riders prioritize comfort and aerodynamics in their fit, or is a more aggressive, stretched out position still the key to optimal performance? How do other factors such as flexibility, core strength, and riding style influence the ideal bike fit, and are there any general principles that can be applied to help riders determine their optimal fit on a Scott Plasma 10?