If you fit the 160 to the RS wheel, then you should be OK. The RS wheel will be either 5.25" or 5.5" and more suited to the 160 as that's a similar size to a 250 slick.
I "think" it will still change the geometry a little though, but the contact patch will be better than squeezing the 160 tyre on a stock 5" rim.
_________________
Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.
Check us out on Facebook! Please "like" our page!