My 2014 has been sitting a week or so due to the snow and extreme cold here in St. Louis. Went for a short drive today and immediately noticed bumping caused by flat spots on the stock 18" Pirelli P Zero Nero tires. It was bad enough that stopped twice to look at them, like a washboard at slow speed. The TPMS light finally came on, the bumping went away after a couple miles of driving but I sure thought I had a broken belt or something.

 

Should be a normal thing....