Originally Posted by
CheGiantForLife
Impossible to replicate 13% grade effort on a flat.
Basic.
I am not sure how exact you must be to 'replicate', but on truly flat ground a stronger rider can come pretty close to replicating a 13% grade on truly flat ground. 275 watts would take a 155'ish pound rider up a hill at around 5.5mph (13%grade). He would turn a 34/32 at 66 rpm.
Go on the flats in a gear of 52/12 at 275 watts and 22.4mph/66 rpm (obviously a similar level of effort) and there you are. Depending on your power output and your gearing this may or may not work for you. It does not work for me because the rolling terrain in my riding area just screws it all up. I am just pretending like I could put out 275 watts for 30 minutes or so - maybe a decade or two back in time.
dave