Okay so I'm a little late posting this, but Last weekend I did my first metric century.
I did the One Helluva Ride in Chelsea, Mi - 64 mile course in 4 hours 6 mins for an average speed of 15.7 mph on my Trek 7.5FX.
There were a lot of hills, seemed like a roller coaster towards the end. The first 38 miles to lunch were easy. but after 50 miles my hands were protesting (I have stock grips, with tape-wrapped barends). Around 60 miles the hills began to take their toll on my knees, but I toughed it out and was able to finish.