After riding with this 18" XJ900 wheel, around the twisting roads here, it feels different than the XS 19" wheel, it feels twitchier, almost like dropping the forks thru the clamps, but at the same time you're really havin' to muscle the bike to lean it over, it digs in and stays on line nicely and changing direction mid corner is easier. These nissin calipers are ready to go on, but I reckon the XS calipers look good anyway, and they still work fine on the smaller lighter discs. The speedo reads the same as before, as that michelin tyre is a high profile 110/90/18, only a few mm's lower than a 100/90/19.