So I've been running 18's with 215/35/18 and happened to get a flat yesterday on my back passenger side. Due to school my funds are low and I found a 215/40/18 on craigslist for 30 bucks with about 70% on it. Will I mess anything up if I run one 215/35/18 in the back and a 215/40/18 on the other side in the back for about a week, maybe two until I can get another matching tire?