I'm proud to say that I completed my first FIXED gear century ride yesterday on my Bianchi Pista Sei Giorni. I Used 48/18. I've done a century on a road bike and last year I did it on my Cyclocross (Spec Crux Evo).
My route was from home in Stoney Creek, Ontario.ca to Niagara Falls, and back.... in 35*C weather. (95*F)
Although I used the CycleMater app on my iPhone the battery crapped out at about 132km... So I'm not sure of my total time. I think about 5.5hrs. (I could Math it out, but I'm lazy)
My average (up until battery loss) was 27.74 km/h (17.25mph). Top speed downhill was 54 km/h. My first century ride averaged 30 km/h (18.5mph) a dozen years ago.
After buying the Bianchi track bike I wanted to see if it was possible for me on a fixed gear bike. Leg cramps started at 100 kms. Cramps were brutal on a fixed gear because I couldn't get out of the clipless pedals fast enough, and couldn't stand and coast. Ouch!
No 'cup holders' on the bike, so I carried two in my jersey.
Also used fixation Pursuit bullhorns, which are not the most comfy for LD rides.
Brooks Cambium was a dream saddle. Highly recommend it. I have two of them.
Considering I just turned 50 a few months ago, I'm pretty chuffed with my accomplishment.
I've seen guys on here ask if it is possible on a FG bike. I say nut up and start peddling. If I can, you can.
Thanks for reading!