Kx125 rim size question

ok not to sure what happened to my post
[probably deleted cus i mentioned kdx]

anyway
i'll rephraze it,,,

i have a 1999 kx125

my question concerns the rear rim.

i want to fit an 18inch rear wheel

i can get a good deal on a set of excel rims

front 21x1.60

rear 18 x 2.15

is the rear rim going to be ok? i know its a little wider then standard?


any advice would be good

thanks

Mark