Is there a manufacturers recommended rider height range for road bikes, or is this a blanket statement that applies to all types of bikes, and if so, how does a manufacturer account for varying body proportions, such as leg length, torso length, and arm length, when recommending a bike size for a rider, and can we trust a manufacturers recommended height range or is this just a rough guideline, and what are the real-world implications of a rider being at the upper or lower end of a manufacturers recommended height range, such as reduced comfort, decreased efficiency, or increased risk of injury, and how do manufacturers test their bikes to determine the optimal rider height range, and is there a universally accepted method for determining the ideal rider height range for road bikes, or is this something that varies from manufacturer to manufacturer, and what role does rider positioning and bike fit play in determining the optimal rider height range for a road bike, and can a rider safely ride a bike that is outside of a manufacturers recommended height range if the bike is properly fitted to their body, and what are the key factors that a manufacturer considers when determining the ideal rider height range for a road bike, and how do these factors vary for different types of bikes, such as mountain bikes, hybrid bikes, and touring bikes, and can a rider use a manufacturers recommended height range as a starting point for determining the ideal bike size, or is this just a rough guideline that should be used in conjunction with other factors, such as rider positioning and bike fit.