The first thing you need to know is that riding a Ural and sidecar is not like riding a standard two-wheeled motorbike. Not only have you got an extra wheel and the weight of the sidecar, but you will be riding on an unfamiliar surface (ice) and most bikes you ride these days aren't based on a 1940's design, because… future.
In short, they're heavy, clunky and pretty slow. Because we are using vintage Urals, they hate the idea of capitalists dogs riding them and have vowed to make your life as miserable as possible. Expect grinding to a spluttering halt when you least need them to and generally being unruly and petulant. The spark plugs stop working, things snap in the cold, they stall and won't start again.... the list of ways this little bike will frustrate you is endless.
As for speed, don't expect to be driving at much more than 80 km/h. Downhill, maybe 95 km/h. But this doesn't feel that clever on ice. The brakes are a little bit shabby too.
Have a read of this here Wired article by Wes Siler to get a feel for the rueful admiration you will come to have for this uniquely infuriating vehicle. His rather excellent conclusion is that,