Iv had my car for 4 years in August, and used it all year round, even with 19"s on, it was alright. As long as you drive to the conditions, and dont expect miracles you will be fine. Yes winter tyres are awesome if you can get a set, but tried for 2 years and then gave up, not to mention the cost and storing them. This year il be taking a different approach which involves a Nissan Note on our company lease scheme, so i can keep the Z tucked up in the garage