what tires sizes to run on 18?
 

I have a set of 18/9 and 18/10.5 on order but I don't know what size tires to run.

the recommended size for 18/9,from 245 to 265
for 10.5 285 to 295
but here this link read it, all you need to know about rims and tires sizes,play with the rim-width calculator

Car Bibles : The Wheel and Tyre Bible Page 4 of 4

stretch some 225 on the 9 and 245 on the 10.5 and you'll be set

:wtf2:

Please dont. I freaking hate that chit. It's a performance car, not a low rider on 13" Daytons.

HAHAHAHA that's funny! thanks for the help guys and the laugh!
:icon17:

im going with a set of 245 fronts and 305 rears nitto nt05 should have them done by the weekend.

245 will be stretched. I mean if you're ok with that.

For reference, the 255 on my 9.5 wheel (wheel is 12mm wider than yours but tire is only 10 mm wider--so that's very close to what you have) looks considerably stretched compared to the 285 on the 10.5.

I would personally go with 265-275 up front and 295 in the rear.