When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I run my tires at 40 but the max is 80. With 18 inch rims with a max psi of 50 I would stick to the mid 30s. Otherwise you will feel every crack in the road. Just my 2 cents.