Weeeelll. I couldn't do 10mph on an 18% grade. I couldn't even stay on the bike on an 18% grade. But my 92% is the same as his and I'm a 56-year-old lady. So there.

Of course, I hit 92% going up an imaginary hill in spin class, and it's probably only a 5% grade if they actually measured the resistance I put on. So I guess while I may have the heart of a Giro rider, I don't have the leg muscles.