it has to do with both, if your wheels are too big say 18 or 19 you won't be able to turn properly as your wheel will hit the guard, likewise with too low of an offset, if you are looking for rims for the jazz anywhere between +30 - +40 should be a perfect fit if the rims are 15x7 16x7 etc. with tyre size my person preference is 205/45/16



this is my car with enkei rp01s +40 16x7 on 205/45/16 to give you an idea