For the record, I'm on a ridged mountain bike with 26 x 1.95 tires. The first time I crossed the sidewalk on the bridge, the foot prints caused me to fishtail all the way across the bridge. It was a heck of a workout, but I stayed on the bike. It was like going over tightly placed whoop t do's that were kicking my back tire around. Another time I was able to get between the outside wall and the foot prints. I know the other side of the foot prints has large chunks of cement that are now covered with snow. Yesterday and today, I was unable to do either and ended up walking. I think with a fat bike the bumpiness would have less affect on me. And, yes studs would definitely help. If I ride tomorrow, I may see if I can get more speed going across it.