The IO has 16" rims as standard, which limits the choice of offroad tyres. Has anyone successfully fitted 15" rims to their IO, and what tyres did this allow you to fit?

I've been thinking about changing to an early 2000s Grand Vitara (ie the model before the current one), probably a 2.5 V6 Auto 5-door, or maybe a diesel auto. Has anyone carried out or is anyone able to offer advice on the following: 1. A 2" - 3" suspension lift. 2. Fitting a lower Low-range ratio ...