My 2007 Vitz is 1.3 FL limited with the body type SCP90 so figured out 185/60/15 from this
[TABLE="class: krparams"]
<tbody>[TR]
[TD]SCP90[/TD]
[TD]2005[/TD]
[TD]14x5.0[/TD]
[TD]39[/TD]
[TD]4x100[/TD]
[TD]165/70R14 [/TD]
[/TR]
[TR]
[TD]15x5.5[/TD]
[TD]45[/TD]
[TD]4x100[/TD]
[TD]185/60R15 [/TD]
[/TR]
[TR]
[TD]2007[/TD]
[TD]14x5.0[/TD]
[TD]39[/TD]
[TD]4x100[/TD]
[TD]165/70R14 [/TD]
[/TR]
[TR]
[TD]15x5.5[/TD]
[TD]45[/TD]
[TD]4x100[/TD]
[TD]185/60R15 [/TD]
[/TR]
</tbody>[/TABLE]
165/70/14 is the OEM size for vitz ,,185/60/15 with 15" rim is the most ideal replacement for vitz