Originally Posted by
dingadinga
By reading reviews in Amazon, I found it interesting to see that many people gained speed from stock tire to a better tire, e.g., Continental GatorSkin tire,
as much as 10~15%. If that's true, I guess it would be the single most important and cheapest upgrade. Is this a common knowledge? If it is the case, I feel so stupid that I had spent all the money on upgrades (bike, wheels, components) except the cheapest and most effective way.
People posting this kind of stuff in reviews do not understand the "scientific method".
Dozens of variables to consider when making comparisons.