Originally Posted by
b0rderline
You say that Crosstrail and Sirrus are essentially the same yet when You ride them one after another You will immediately notice that Sirrus is more agile and You have more upright position on it (comparing the sizes that are the best fit for You).
I can't account for the riding position, but wheels and tires have
a lot to do with a bike feeling quicker and more agile. I recently put road wheels and tires on my Giant Roam 2 and the difference was very noticeable.