CG125 have absolutely no grip on its rear end, when on high speeds (higher than 60kmph specifically). I have mentioned it above that CG125 relies 80-90% on its front braking power, so having a disk at the front makes total sense (still needs slightly wider tire at front for maximum grip while braking)
Rear disk brake setup will be a total killer on this bike, and i dread to think what would become of the rider at high speeds. Can't comprehend WHY the owner have chosen it.
Anyway, even if this bike is not owned by sualehsmarty, i would still like to have a word with the owner and ask a few questions about these mods.