For narrow 14 or 15" wheels to suit the boy, try:-
http://www.hankooktyre.com.au/V2/produc ... cr&id=1089
or
http://www.stamfordtyres.com/tpl/produc ... ntal2.html
or
http://www.stamfordtyres.com/tpl/produc ... st115.html
And there are more brands who do these size (kei) tyres...
My 165 15's are quite wide for 165's though. a couple of tyre shops guessed (without looking at the writing on the tyres) that they were 205's.
Much wider than my previous 155's anyhoo