my reasons are simple. It was my friends car and he told me to not worry about breaking anything just don't blow it up. Also, the 205/50/15 azenis on a 15 inch rota weigh a bit more then the 13" slicks and race wheels and also i don't know if you were there or not but everybody that ran in my class had slicks. just the little advantages that help. It's not like pulling the rear seat out of a stock integra/civic to make you faster. slicks actually do something.