Anxiety Disorder Due to Medical Condition. Some diseases and Illnesses cause anxiety, including symptoms that directly mimic anxiety disorders. For example, thyroid conditions can cause sudden and extreme anxiety. Lyme disease can also cause panic attacks and anxiety.
SL: Standard Load; tire for normal usage and loads; XL: eXtra Load; a tire that allows a higher inflation pressure than a Standard Load tire, which increases the tire's maximum load; RF: Reinforcedâfor Euro-metric tires, the term 'reinforced' means the same thing as 'Extra Load' RFT: Run-Flat Tire; Tires designed for vehicles without spare tires.
Function. Tires are given a maximum load rating based on the tire's size, construction and inflation pressure. P-metric sized tires--tires with sizes starting with a P such as P235/75R15--are given a load range rating of either SL or XL.