downgrading

Hi everyone. I have an ibiza 5 dr 2004 100 hp, with 195/55/15 tires. I need to change my tires with new ones. I'm considering changing my tires with 185/60/15. What will be the differences? I'm thinking about this change for the costs. The 185/60/15 tires will be %30 lower than 195/55/15 in our...