vw golf mk3 alloys?

At the moment my vw golf mk 3 has its original wheels on, at: Width - 185 Profile - 60 Wheel Size - 14 Speed - H Load - 82.

i want to put a set of vw golf mk2 gti bbs latice alloys on but i'm not sure if a can get away with 15" wheels as it only has 14" on.

will 15" fit without rubbing? what about the speedo? will that need recallibrating if i upsize the wheels?

any help is grateful

cheers.