Wider hubs make spreading the rear stays needed (to make stuffing the hub in,less difficult ..

Aka Cold setting... Its done commonly ..

As Is a 2 person job to cram in a wider hub if you dont spread the frame. previously

SA 5 speed and 3 speed go in 111 width (folder front hubs are 74mm)

yea there are narrower hubs than shimano & nuvinci.