check my pics, the most important thing is to pay attention to back spacing. I don't know what the 250sx fron back spacing is but as long as you keep it the same or the same ratio and it will clear the brake you will be fine. 9 should clear easy.
I have tens in the back and a 12x7 up front. I went 7 inches wide up front 2x5 the stock big red 9 inch was 3x6. thats what I mean by ratio.
1983 honda 70atc, als,ot done, need throttle cable and assembly. PM me if you have this.
1985 honda es 250 big red.
85 percent restore. 10x10 douglas 190's 22-11-10 at 489's. 12x7 itp c series 24-8-12 swamp fox. some accent painting. snorkel everything and a custom PCV system. moose air filter. cobra utility exhaust. 2.5 um wheel spacers.
A trike to show up the modern utilitys
2002 scrambler 400 2x4 uni pod filter, lots of weight shaving, v force reeds, HPD race pipe, 39mm pwk or 34mm, 12-1 head, trail porting, custom clutching, hole shots on t-9s +1 all around. works shocks . trail bike with drag tweeks.