Yeah, that's bad news - 160 is ideal on the stock wheel....I need another 180 rear tire for my F3 wheel and I have a Metzler MEZ1 with ~80% tread left in a 160 series I will trade you. I might even give ya a little cash too if the tire is in good shape
You're not gonna die. I ran one on mine before seeing the light. It makes it corner alot slower, but will not kill you. Alot of people around here run that size no matter what size rim they have, just because there is a track right down the road and take-offs are dirt cheap. After running a regular size, I'll never go back to that big one.