Which is exactly why I speak about finding the city and only maybe the ballpark. There are also differences that are simply about what you're used to and what feels different. Folks like to debate the details, but I don't like to fret about any small stuff who's variance is less than the margin of error in the big stuff. It's a bike, you turn the pedals and it goes. After that it's pretty much nonsense for all but the most serious riders.