>>1135441I suppose, in a perfect world, everyone would have a frame custom-made specifically for them, after making extensive measurements of your body, looking at how you ride, and so on, so that once the bike was assembled you'd only need to make minor adjustments. But since we don't all have $10000 for a bike, that's not how it's done.
You get a frame of an appropriate size for you, and saddle size/shape, saddle height, saddle fore/aft adjustment, stem length, stem angle, and handlebar size are all used to give you the proper fit, so you can ride efficiently, comfortably, and not cause damage to yourself. This is what an experienced, skilled bike-fitter does: helps you pick these components, and makes the appropriate adjustments.
Of course there will now be comments as to how bike-fitting is a ripoff and you don't need it. If you ride only rarely, or for only really short distances, then your body can put up with just about anything. But if you spend a lot of time on a bike, riding long distances and/or at high intensities, then having a bike that is fitted to you is essential.
