No input? Rubbing? Horrible handling? Anything?
JM
My 900 had a 170 OEM on a 5.5" rim.
I don't
think you'll have an issue with a 170 on the 4.5" rim. The handling will be very slightly slower...if that particular tire is actually different than the 160's you're used to.
I know on an SS the hugger will rub on the top of the tire if a 5.5" rim and a 180 tire is fitted.
I say go for it if the price is right.