I was curious, so following up with weights on the freewheels:
Sunrace 10 speed 11-36 - 670g
Sachs 7 speed 13-34 - 560g
Sunrace 7 speed 13-28 - 485g
Atom 77 6 speed 14-28 - 470g
So almost 1/2lb more for the gears which was about the same as going from 23 to 32 wide tires.