Well as I don't have a powermeter I don't know. But using this site http://www.kreuzotter.de/english/espeed.htm you can get a bit of an estimate. So using some of my ride data, I figure Max sustainable output is about 250watts (using a hill gradient I know) Average output is about 136 watts (using a few flattish rides I do) Which all in all seems quite paltry No wonder I need lower gears. Not quite in the Chris Hoy/Victoria Pendleton league. What do you get?