Hark,
You've not given any specifics for the Michelin tyres... profile, width, etc..?
Check out this tyre width equivalency table on this site. It should help determine which sort of tyres rims can take...
http://www.kouki.co.uk/utilities/visual-tyre-size-calculator
Messing with your profile will mess up your speedo... plug in your details above and you'll see.
