Originally Posted by kermie

You will notice, but it won't be bad. When I moved to Denver from the Dallas/Fort Worth Metroplex, I took my bike out for a ride. I felt great and thought the 5400 feet was nothing. This was until I hit the first hill. I felt it. Now it's good but I have been here a few years. I work at the airport and watching people running to catch a flight, there are many that get winded fast.