Cupra Formentor VZ FL winter bikes

Hello, I’m looking forward to buying my VZ as 2.0 TSI. I also need winter bikes to do this. Since I need at least 19, I have the question whether ET38 or ET40 or whether both are possible. Tires will be 245/40. My 15 year old account was unfortunately deleted so I had to re-register Thank you for your feedback.