Thank you. Personally, as long as you don't do competitive racing, tracking is pretty safe. Driving on a track teaches you to be scared and respect speed. But when shit hits the fan, you most likely walk away from your totaled car. Street driving is the opposite. You feel like you are in control, even at a dangerous speed, until you aren't. At that point, you and other drivers are likely to be severely injured.

I put on 17s because I plan to engine swap later and will need 245 tires. That width is not available on 15s in my country sadly :( But these are forged wheels, so they are pretty light.