silver02s2000

I recently picked up some kosei wheels 17x8+45 I was just trying to decide what tire size would look good maybe 215/45/17 all the way around?

Manga_Spawn

What? Why would you do such narrow tires? That's like running ap2 front wheels all around. Run 215 front and 245 rear or you could do 225 all around but it is not optimal. Why didn't you get 17x9's for the rear?

riceball777

First of all you have a bad and incorrect rim size. People will bash you have you for running rims more narrow than the stock 8.5 rims.
People will bash you if your into the stretch tire and hella flush style. Stretch tires are dumb

If you must run those rims the. I would run 245/40/17 all around or you can fit 255/40/17 all around on only 8 inch wide rims. Evo 8/9 guys do it all the time on there stock 17x8 rims.

1nate7

Staggered: 215/45, 245/40
Non-staggered: 245/40 all around

If you run non-staggered make sure you have the fender work required to fit a 245/40 up front and I would recommend a stiffer front sway bar, something like Eibach. Do NOT run a 215/45 rear.

Back S2k

If they are not the original kosei k1's get rid of them if they are then keep em cause they are kind of rare and a super dope wheel, you can still fit a 245/40 on there so just run that, they might mashroom slightly depending on the tire you choose but you can get away with it.