i have 14's on me Glanza at the min. They seem alright and the car handles well but I have just ordered some Buddy Club SF Challenge in 15's because i didnt like the look of the alloys it came with. I asked the guys at japshop.co.uk their advise and they said that 15's would be best as you get great handling and looks, i think sometimes a bigger wheel can look to much exspecially on a smaller car like a starlet.