As of yesterday, 19 August, I have ridden a total of 15 metric centuries. That total includes 5 IMPERIAL centuries 3 of which I did in July. I would have possibly had several more imperials if it weren't for weather and/or bike problems. I've missed out on the opportunity on 3 this month due to bike problems (waiting for a freewheel to come in) I finished a tough metric century (68+ miles) yesterday in only my big ring! Thankfully after that grueling ride, my freewheel was replaced. Strangely, I DID have my best average that I can remember on a metric yesterday at 12mph.
And yes ladies, this was a soon to be 45 year old, fat chick (260+) lbs on a TREK NAVIGATOR 50 COMFORT BIKE and totally self supported!!! Centuries and metrics ARE addicting once you start them.