On a more serious note though, what have you done with the suspension and geometry. I can honestly say only one MC21 I've ridden with 120/160 tyres rode properly, and that had HRC wheels, suspension, frame, and geometry.
Getting 110/150 can be a pain, but I think the Aprilia RS125 runs those sizes now, so it should be easier to get good rubber once again these days.
_________________
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!