Learn something every day
Never knew that about the heights? Well there you go
Any time i upgraded my tyres to wider ones on old cars with no power steering i always felt the steering a bit heavier, would assume the scoot would be the same. It may not make much difference, i dont know cos i never tried it tho on a scooter. Yet
I cant see it making too much improvement in ice or bad weather over a good set of aftermarket tyres in the stock sizes tho, if you hit ice on 120's its going to be the same outcome as it would be if you had 130's imo.
I would stick with stock 120 width myself on the front prob.