Wilier 101X Hybrid XT MTB E-Bike handlebar clamp size?

[sodoff]

Although this bike is marketed as a cross country mtb, it comes with a ridiculously wide 800mm handlebar. I'll struggle to get it through the doorway of my garage, between trees, or even safely past traffic on our narrow lanes.
I'll be wanting a narrower bar, but can't find any spec online from Wilier, google etc, as to what the handlebar clamp size is. Anybody?

 

[JRA]

Take a plumbers pipe cutter and cut it down. It is done all the time no worries. Remove the grips first of course then loosen the levers and slide them in to get a fee for how wide you want to end up with. Measure twice, cut once!

 

[JRA]

With the amount of information in your original post Good Luck!