New to 370z and tire comfused?

[stiggo1961]

Hi all,
New to the 370z world with a white touring with spt pkg model, wow what a car!

Going through the choices of winter driving with the std 19" wheels. Probably going with the Blizzaks LM60's, being cheaper than the LM32's, and having no real knowledge of any advantages of either. But I see a lot of comments re-changing to 18" from the 19" which would mean new rims also. Not sure I can afford all of the changes, so was hoping for some reassuring comments from people driving the std spt pkg sizes through the winter?

Anybody with help would be greatly appreciated as the weather is changing here pretty quickly now, and there is an offer at one of our local stores for a 4 for 3 deal.

Thanks
Stiggo