anyone know of a good average tire size people are using on 16 inch iroc wheels..

245/50ZR-16 Are you putting them on your Elky? If so this size may be a bit to wide in the front, especially if you lowered the front. You will need spacers on the front. I've got GTA wheels for mine, back wheels on front, front wheels on back.

the car is not lowered on the front just plain stock..with plain stock iroc 16s...what size can i do without having to put any spacers on.

what size wheel spacers am i going to need? and where would i get something like that from?